docs: complete German structured documentation

README.md

@@ -26,7 +26,10 @@ The executable backend slice now exposes:
   assignment/evidence/Decision/record references, and replay-safe lifecycle
   events; and
 - `cases.service_launcher`, which opens exactly one deterministic case from an
-  exact published Service revision and safely replays the same Portal launch.
+  exact published Service revision and safely replays the same Portal launch;
+  and
+- `tickets.case_escalation`, which creates exactly one formal Case from an
+  authorized Ticket handoff while preserving a governed Ticket reference.
 
 Cases does not own institutional Service, Party, representation, identity,
 address, Mandate, Decision, file, workflow, or task lifecycles. The `/cases`
@@ -38,3 +41,26 @@ uses the shared reference selector to manage those grants; list, detail,
 history, timeline, and update paths all apply the same fail-closed ACL.
 
 See [docs/CONCEPT.md](docs/CONCEPT.md) for the current module concept.
+
+## Data-subject requests
+
+Cases contributes `privacy.dsar.cases`. It reports exact-tenant access grants
+and operator attribution, plus minimized case lifecycle data when an explicit
+Cases reference is supplied and corroborated. Raw snapshots, metadata, search
+text, free-text reasons, event payloads, evidence identifiers, request digests,
+idempotency keys, audit internals, and unrelated access subjects are excluded.
+Historical case evidence is retained; current open case and active access facts
+require authorized manual review through the existing lifecycle. Applicant
+identity correlation remains a Parties responsibility and is never guessed
+from a case's party references.
+
+## Ticket escalation
+
+When Tickets requests escalation, Cases rechecks tenant membership and
+`cases:case:create`, resolves the exact active Case type and its initial status,
+and derives a deterministic Case ID from the Ticket and idempotency key. A retry
+returns the same Case. The Case keeps only the stable Ticket reference, source
+revision, number, and authorized handoff note in governed context; it does not
+copy Ticket comments, attachments, participants, or lifecycle state. If Cases
+is absent or the configured type is unavailable, Tickets remains usable and
+shows the integration consequence to the operator.

docs/CONCEPT.md

@@ -90,6 +90,7 @@ The persistent backend provides:
 - tenant-level resource ACL and tenant summary providers
 - tenant-wide or restricted object access with explicit, revisioned grants
 - deterministic, replay-safe case launch from an exact Service binding
+- deterministic, replay-safe Case escalation from an authorized Ticket handoff
 
 The `/cases` list and `/cases/:caseId` detail workspace provide server-side
 search/status filtering, case facts, typed references, history, timeline, and
@@ -159,13 +160,44 @@ reference. Retrying the same launch returns the existing case; a changed request
 cannot reuse the key. Portal therefore cannot create duplicate cases after an
 ambiguous network response and does not gain access to Cases tables.
 
+`tickets.case_escalation` is the optional effect boundary used by Tickets. It
+rechecks `cases:case:create`, tenant identity, and the requested active Case
+type, then derives a stable Case identifier from the Ticket and idempotency key.
+The Case stores a governed `work_item` reference plus bounded source and handoff
+metadata. It never imports Tickets or copies Ticket messages, files,
+participants, assignment, or lifecycle. Replaying the same handoff returns the
+existing Case, while an unavailable Cases capability leaves the operational
+Ticket intact.
+
 Cases links formal Decision records and may retain a current outcome/status
 projection. It does not own decision authority, rule versions, reasoning,
 correction, revocation, or remedy semantics.
 
+The Case detail decision path is a guarded composition boundary. It resolves an
+exact Case revision, rechecks Case update access, verifies the current acting
+assignment through Access, and requires exactly one effective Mandate for
+`cases.formal_decision` and the selected Decision type. Only then does it call
+the optional Decisions registry and append the exact Decision reference to a
+new Case revision in the same transaction. Deterministic identifiers make an
+unchanged retry safe, while changed replay payloads and stale Case revisions
+fail closed. Cases still does not store the protected result or reasoning.
+
 Evidence links should store only stable module/resource references and display
 metadata snapshots. The owning module remains responsible for the real object.
 
+When Records is enabled, `records.source.cases` resolves one exact immutable
+case revision for eAkte filing. Cases rechecks current tenant, scope, and
+object-level access, then returns the case number, lifecycle state, represented
+valid interval, recorded time, canonical snapshot digest, and launch link.
+Records owns the filing decision and chronology; Cases remains authoritative
+for the case and its revision history.
+
+When Search is enabled, `cases.cases` indexes current Case titles, numbers,
+types, states, and the existing bounded search projection. It includes no
+provider-owned evidence content or protected Decision reasoning. Restricted
+Case candidates carry bounded ACL tokens and every result is checked again
+against the current Case object-access decision before disclosure.
+
 ## WebUI
 
 Initial route contributions:
@@ -173,8 +205,11 @@ Initial route contributions:
 - `/cases`
 - `/cases/:caseId`
 
-The initial detail view renders the module-owned record, stable references,
+The detail view renders the module-owned record, stable references, history,
-history, and timeline. Future linked forms, files, tasks, workflow state,
+timeline, and provider-resolved formal Decisions when currently authorized. It
+can record a direct officer Decision when Access, Mandates, and Decisions are
+enabled and can launch exact Case or Decision filing when Records is enabled.
+Future linked forms, files, tasks, workflow state,
 appointments, documents, communication, payment evidence, and richer audit
 panels must arrive through declarative extension points, without direct UI
 imports from sibling modules.
@@ -192,6 +227,26 @@ The focused suite covers:
 - explicit and assignment-derived case access, including non-disclosure
 - exact Service launch, deterministic replay, and conflict behavior
 
+## Data-subject requests
+
+Cases publishes `privacy.dsar.cases`. Canonical account, identity, and
+membership selectors cover Cases-owned operator attribution; account and
+identity selectors also cover explicit case-access grants. Exact
+`cases.case`, `cases.revision`, `cases.access_grant`, and `cases.timeline`
+references select lifecycle data. When a canonical and direct selector are
+combined, a Cases-owned relationship must corroborate them and all supplied
+direct references must identify the same case.
+
+Direct case results are typed projections rather than stored snapshots. They
+exclude opaque metadata, search text, free-text change reasons, timeline
+payloads and summaries, evidence identifiers, request hashes, idempotency
+keys, audit identifiers, and unrelated access subjects. Applicant-to-identity
+correlation is owned by Parties; Cases does not infer it from opaque party
+identifiers. Immutable case identities, revisions, timelines, and operator
+attribution receive retention actions. Current open case facts and active
+access grants receive non-executable manual-review actions and can only be
+changed through the authorized case/access lifecycle.
+
 ## Open Decisions
 
 - Whether comments belong in cases, tasks, or a collaboration module.

package.json

@@ -0,0 +1,33 @@
+{
+  "name": "@govoplan/cases-webui",
+  "version": "0.1.22",
+  "private": true,
+  "type": "module",
+  "main": "webui/src/index.ts",
+  "module": "webui/src/index.ts",
+  "types": "webui/src/index.ts",
+  "exports": {
+    ".": {
+      "types": "./webui/src/index.ts",
+      "import": "./webui/src/index.ts"
+    },
+    "./styles/cases.css": "./webui/src/styles/cases.css"
+  },
+  "files": [
+    "webui/src",
+    "README.md",
+    "LICENSE"
+  ],
+  "peerDependencies": {
+    "@govoplan/core-webui": "^0.1.30",
+    "lucide-react": "^1.23.0",
+    "react": ">=19.2.7 <20",
+    "react-dom": ">=19.2.7 <20",
+    "react-router": ">=8.3.0 <9"
+  },
+  "peerDependenciesMeta": {
+    "@govoplan/core-webui": {
+      "optional": true
+    }
+  }
+}

pyproject.toml

@@ -4,12 +4,12 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "govoplan-cases"
-version = "0.1.15"
+version = "0.1.22"
 description = "GovOPlaN administrative case context module."
 readme = "README.md"
 requires-python = ">=3.12"
 authors = [{ name = "GovOPlaN" }]
-dependencies = ["govoplan-core>=0.1.15"]
+dependencies = ["govoplan-core>=0.1.30"]
 
 [tool.setuptools.packages.find]
 where = ["src"]

src/govoplan_cases/backend/decision_path.py

@@ -0,0 +1,478 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, replace
+from datetime import datetime
+import uuid
+
+from sqlalchemy.orm import Session
+
+from govoplan_core.core.access import CAPABILITY_ACCESS_SEMANTIC_DIRECTORY
+from govoplan_core.core.institutional import (
+    CAPABILITY_DECISION_REGISTRY,
+    CAPABILITY_MANDATE_RESOLVER,
+    ActorRepresentationReference,
+    DecisionRegistry,
+    FormalDecision,
+    GovernedContextEnvelope,
+    InstitutionalReference,
+    MandateDefinition,
+    MandateResolution,
+    MandateResolutionRequest,
+    MandateResolver,
+    TemporalRevision,
+    resolve_mandate_candidates,
+)
+from govoplan_cases.backend.domain import CaseRecord
+from govoplan_cases.backend.service import (
+    can_access_case,
+    get_case,
+    update_case,
+)
+
+
+DECISION_READ_SCOPE = "decisions:decision:read"
+DECISION_SENSITIVE_READ_SCOPE = "decisions:decision:read_sensitive"
+DECISION_WRITE_SCOPE = "decisions:decision:write"
+_DECISION_NAMESPACE = uuid.uuid5(
+    uuid.NAMESPACE_URL,
+    "https://govoplan.add-ideas.de/contracts/cases/formal-decision/v1",
+)
+
+
+class CaseDecisionError(ValueError):
+    pass
+
+
+class CaseDecisionUnavailable(CaseDecisionError):
+    pass
+
+
+@dataclass(frozen=True, slots=True)
+class CaseDecisionCommand:
+    expected_case_revision: int
+    effective_at: datetime
+    decision_type: str
+    operative_result: str
+    reasoning: str
+    change_reason: str
+    idempotency_key: str
+    conditions: tuple[str, ...] = ()
+
+
+@dataclass(frozen=True, slots=True)
+class CaseDecisionResult:
+    case: CaseRecord
+    decision: FormalDecision
+    replayed: bool = False
+
+    def to_dict(self) -> dict[str, object]:
+        return {
+            "case": self.case.to_dict(),
+            "decision": self.decision.to_dict(include_protected=True),
+            "replayed": self.replayed,
+        }
+
+
+class CaseDecisionPath:
+    """Record a formal outcome and its exact Case reference atomically."""
+
+    def __init__(self, registry: object | None = None) -> None:
+        self._registry = registry
+
+    def record(
+        self,
+        session: Session,
+        principal: object,
+        *,
+        case_id: str,
+        command: CaseDecisionCommand,
+    ) -> CaseDecisionResult:
+        _validate_command(command)
+        source_case = get_case(
+            session,
+            principal,
+            case_id=case_id,
+            revision=command.expected_case_revision,
+        )
+        current = get_case(session, principal, case_id=case_id)
+        if source_case is None or current is None:
+            raise LookupError("Case not found.")
+        if not can_access_case(
+            session,
+            principal,
+            case_id=case_id,
+            permission="update",
+        ):
+            raise PermissionError("Case update access is denied.")
+
+        decision_id = _decision_id(source_case, command.idempotency_key)
+        existing_ref = next(
+            (
+                item
+                for item in current.decision_refs
+                if item.owner_module == "decisions" and item.object_id == decision_id
+            ),
+            None,
+        )
+        if existing_ref is None and current.revision != command.expected_case_revision:
+            raise CaseDecisionError(
+                "Case revision conflict: reload the Case before recording a Decision."
+            )
+
+        decision_registry = _decision_registry(self._registry)
+        mandate = _resolve_mandate(
+            self._registry,
+            session,
+            principal,
+            case=source_case,
+            command=command,
+        )
+        actor = _resolve_actor(
+            self._registry,
+            principal,
+            case=source_case,
+            mandate=mandate,
+            effective_at=command.effective_at,
+        )
+        decision = _decision(
+            source_case,
+            command=command,
+            decision_id=decision_id,
+            mandate=mandate,
+            actor=actor,
+        )
+        persisted = decision_registry.record_decision(
+            session,
+            principal,
+            decision=decision,
+        )
+
+        if existing_ref is not None:
+            return CaseDecisionResult(
+                case=current,
+                decision=persisted,
+                replayed=True,
+            )
+
+        linked = update_case(
+            session,
+            principal,
+            case_id=case_id,
+            expected_revision=current.revision,
+            changes={"decision_refs": (*current.decision_refs, persisted.reference)},
+            recorded_at=command.effective_at,
+            change_reason=command.change_reason,
+            idempotency_key=f"formal-decision:{command.idempotency_key}",
+        )
+        return CaseDecisionResult(case=linked, decision=persisted)
+
+    def linked(
+        self,
+        session: Session,
+        principal: object,
+        *,
+        case_id: str,
+    ) -> tuple[FormalDecision, ...]:
+        case = get_case(session, principal, case_id=case_id)
+        if case is None:
+            raise LookupError("Case not found.")
+        registry = _decision_registry(self._registry)
+        resolved: list[FormalDecision] = []
+        for reference in case.decision_refs:
+            if reference.owner_module != "decisions":
+                continue
+            item = registry.get_decision(
+                session,
+                principal,
+                reference=reference,
+            )
+            if item is not None:
+                resolved.append(item)
+        return tuple(resolved)
+
+
+def _decision(
+    case: CaseRecord,
+    *,
+    command: CaseDecisionCommand,
+    decision_id: str,
+    mandate: MandateDefinition,
+    actor: ActorRepresentationReference,
+) -> FormalDecision:
+    evidence = tuple(
+        dict.fromkeys((*case.evidence_refs, *case.context.evidence, *mandate.evidence))
+    )
+    legal_bases = tuple(
+        dict.fromkeys((*case.context.legal_bases, *mandate.legal_bases))
+    )
+    if not evidence:
+        raise CaseDecisionError(
+            "A formal Decision requires evidence linked to the exact Case revision."
+        )
+    if not legal_bases:
+        raise CaseDecisionError(
+            "A formal Decision requires an effective legal-basis version."
+        )
+    decision_ref = InstitutionalReference(
+        kind="decision",
+        owner_module="decisions",
+        object_id=decision_id,
+        tenant_id=case.reference.tenant_id,
+        version="1",
+        valid_at=command.effective_at,
+    )
+    temporal = TemporalRevision(
+        revision="1",
+        valid_from=command.effective_at,
+        recorded_at=command.effective_at,
+        change_reason=command.change_reason,
+    )
+    authority_context: GovernedContextEnvelope = replace(
+        case.context,
+        temporal=temporal,
+        actor=actor,
+        mandate_ref=mandate.reference,
+        case_ref=case.reference,
+        party_refs=case.party_refs or case.context.party_refs,
+        decision_ref=decision_ref,
+        record_refs=case.record_refs,
+        legal_bases=legal_bases,
+        evidence=evidence,
+    )
+    return FormalDecision(
+        reference=decision_ref,
+        temporal=temporal,
+        decision_type=command.decision_type.strip(),
+        subject_refs=case.party_refs or (case.reference,),
+        state="decided",
+        authority_context=authority_context,
+        fact_evidence=evidence,
+        legal_bases=legal_bases,
+        operative_result=command.operative_result.strip(),
+        reasoning=command.reasoning.strip(),
+        conditions=tuple(item.strip() for item in command.conditions if item.strip()),
+    )
+
+
+def _resolve_mandate(
+    registry: object | None,
+    session: Session,
+    principal: object,
+    *,
+    case: CaseRecord,
+    command: CaseDecisionCommand,
+) -> MandateDefinition:
+    resolver = _capability(registry, CAPABILITY_MANDATE_RESOLVER)
+    if not isinstance(resolver, MandateResolver):
+        raise CaseDecisionUnavailable(
+            "Formal Decisions require an enabled Mandates resolver."
+        )
+    request = MandateResolutionRequest(
+        tenant_id=case.reference.tenant_id,
+        effective_at=command.effective_at,
+        task_type="cases.formal_decision",
+        authority_type=command.decision_type.strip(),
+        organization_unit_ref=case.context.organization_unit_ref,
+        function_ref=case.context.function_ref,
+        jurisdiction_refs=case.context.jurisdiction_refs,
+    )
+    resolution: MandateResolution = resolver.resolve_mandate(
+        session,
+        principal,
+        request=request,
+    )
+    if not resolution.competent:
+        raise CaseDecisionError(
+            resolution.explanation or "The acting function is not competent to decide."
+        )
+    if resolution.conflict_refs:
+        raise CaseDecisionError(
+            "Mandate resolution has unresolved conflicts: "
+            + ", ".join(resolution.conflict_refs)
+        )
+    verified = resolve_mandate_candidates(request, resolution.mandates)
+    if not verified.competent or len(verified.mandates) != 1:
+        raise CaseDecisionError(
+            verified.explanation
+            or "A formal Decision requires exactly one effective active Mandate."
+        )
+    return verified.mandates[0]
+
+
+def _resolve_actor(
+    registry: object | None,
+    principal: object,
+    *,
+    case: CaseRecord,
+    mandate: MandateDefinition,
+    effective_at: datetime,
+) -> ActorRepresentationReference:
+    directory = _capability(registry, CAPABILITY_ACCESS_SEMANTIC_DIRECTORY)
+    lookup = getattr(directory, "get_function_assignment", None)
+    if not callable(lookup):
+        raise CaseDecisionUnavailable(
+            "Formal Decisions require the Access semantic directory to verify the acting assignment."
+        )
+    acting_id = _text(getattr(principal, "acting_assignment_id", None))
+    granted_ids = tuple(
+        sorted(
+            {
+                str(item).strip()
+                for item in (getattr(principal, "function_assignment_ids", ()) or ())
+                if str(item).strip()
+            }
+        )
+    )
+    if acting_id and acting_id not in granted_ids:
+        raise PermissionError("The selected acting assignment is not active for this account.")
+    candidate_ids = (acting_id,) if acting_id else granted_ids
+    matching = []
+    for assignment_id in candidate_ids:
+        assignment = lookup(assignment_id)
+        if assignment is None or not _assignment_matches(
+            assignment,
+            principal,
+            case=case,
+            effective_at=effective_at,
+        ):
+            continue
+        matching.append(assignment)
+    if not matching:
+        raise PermissionError(
+            "No active acting assignment matches the Case organization and function."
+        )
+    if len(matching) > 1:
+        raise CaseDecisionError(
+            "Select one acting assignment in the title bar before recording the Decision."
+        )
+    assignment = matching[0]
+    return ActorRepresentationReference(
+        tenant_id=case.reference.tenant_id,
+        account_id=_required_principal_text(principal, "account_id"),
+        identity_id=_text(getattr(principal, "identity_id", None))
+        or _text(getattr(assignment, "identity_id", None)),
+        represented_account_id=_text(
+            getattr(principal, "acting_for_account_id", None)
+        ),
+        represented_function_ref=case.context.function_ref,
+        function_assignment_ref=InstitutionalReference(
+            kind="function_assignment",
+            owner_module="access",
+            object_id=str(getattr(assignment, "id")),
+            tenant_id=case.reference.tenant_id,
+            valid_at=effective_at,
+        ),
+        delegation_ref=_text(
+            getattr(assignment, "delegated_from_assignment_id", None)
+        ),
+        mandate_ref=mandate.reference,
+    )
+
+
+def _assignment_matches(
+    assignment: object,
+    principal: object,
+    *,
+    case: CaseRecord,
+    effective_at: datetime,
+) -> bool:
+    organization = case.context.organization_unit_ref
+    function = case.context.function_ref
+    if organization is None or function is None:
+        raise CaseDecisionError(
+            "The Case lacks the responsible organization and function required for a formal Decision."
+        )
+    if str(getattr(assignment, "tenant_id", "")) != case.reference.tenant_id:
+        return False
+    if str(getattr(assignment, "account_id", "")) != _required_principal_text(
+        principal, "account_id"
+    ):
+        return False
+    if str(getattr(assignment, "function_id", "")) != function.object_id:
+        return False
+    if str(getattr(assignment, "organization_unit_id", "")) != organization.object_id:
+        return False
+    if str(getattr(assignment, "status", "active")) != "active":
+        return False
+    valid_from = getattr(assignment, "valid_from", None)
+    valid_until = getattr(assignment, "valid_until", None)
+    return not (
+        (valid_from is not None and effective_at < valid_from)
+        or (valid_until is not None and effective_at >= valid_until)
+    )
+
+
+def _decision_registry(registry: object | None) -> DecisionRegistry:
+    provider = _capability(registry, CAPABILITY_DECISION_REGISTRY)
+    if not isinstance(provider, DecisionRegistry):
+        raise CaseDecisionUnavailable(
+            "Formal Decisions require an enabled Decision registry."
+        )
+    return provider
+
+
+def _decision_id(case: CaseRecord, idempotency_key: str) -> str:
+    return str(
+        uuid.uuid5(
+            _DECISION_NAMESPACE,
+            ":".join(
+                (
+                    case.reference.tenant_id,
+                    case.reference.object_id,
+                    str(case.revision),
+                    idempotency_key.strip(),
+                )
+            ),
+        )
+    )
+
+
+def _validate_command(command: CaseDecisionCommand) -> None:
+    for value, label in (
+        (command.decision_type, "Decision type"),
+        (command.operative_result, "Operative result"),
+        (command.reasoning, "Decision reasoning"),
+        (command.change_reason, "Decision change reason"),
+        (command.idempotency_key, "Decision idempotency key"),
+    ):
+        if not value.strip():
+            raise CaseDecisionError(f"{label} is required.")
+    if command.expected_case_revision < 1:
+        raise CaseDecisionError("Expected Case revision must be positive.")
+    if command.effective_at.tzinfo is None or command.effective_at.utcoffset() is None:
+        raise CaseDecisionError("Decision effective_at must include a timezone.")
+
+
+def _capability(registry: object | None, name: str) -> object | None:
+    if (
+        registry is None
+        or not hasattr(registry, "has_capability")
+        or not hasattr(registry, "capability")
+        or not registry.has_capability(name)
+    ):
+        return None
+    return registry.capability(name)
+
+
+def _text(value: object | None) -> str | None:
+    normalized = str(value or "").strip()
+    return normalized or None
+
+
+def _required_principal_text(principal: object, name: str) -> str:
+    value = _text(getattr(principal, name, None))
+    if value is None:
+        raise PermissionError(f"The current principal has no {name.replace('_', ' ')}.")
+    return value
+
+
+__all__ = [
+    "CaseDecisionCommand",
+    "CaseDecisionError",
+    "CaseDecisionPath",
+    "CaseDecisionResult",
+    "CaseDecisionUnavailable",
+    "DECISION_READ_SCOPE",
+    "DECISION_SENSITIVE_READ_SCOPE",
+    "DECISION_WRITE_SCOPE",
+]

src/govoplan_cases/backend/dsar_provider.py

@@ -0,0 +1,729 @@
+from __future__ import annotations
+
+from collections.abc import Mapping, Sequence
+from dataclasses import dataclass
+from datetime import datetime, timezone
+
+from sqlalchemy import or_
+from sqlalchemy.orm import Session
+
+from govoplan_cases.backend.db.models import (
+    CaseAccessGrant,
+    CaseIdentity,
+    CaseRecordRevision,
+    CaseTimelineEntry,
+)
+from govoplan_cases.backend.domain import CaseRecord
+from govoplan_core.core.dsar import (
+    DsarErasureActionRef,
+    DsarExecutionResultRef,
+    DsarRecordRef,
+    DsarSubjectRef,
+    dsar_capability_name,
+)
+
+
+CASES_DSAR_CAPABILITY = dsar_capability_name("cases")
+_MAX_RECORDS = 5_000
+
+
+@dataclass(frozen=True, slots=True)
+class _SubjectSelectors:
+    account_id: str | None
+    identity_id: str | None
+    membership_id: str | None
+    case_id: str | None
+    revision_id: str | None
+    access_grant_id: str | None
+    timeline_id: str | None
+
+    @property
+    def actor_ids(self) -> tuple[str, ...]:
+        return tuple(
+            value
+            for value in (self.account_id, self.identity_id, self.membership_id)
+            if value
+        )
+
+    @property
+    def has_canonical_selector(self) -> bool:
+        return bool(self.actor_ids)
+
+    @property
+    def has_direct_selector(self) -> bool:
+        return bool(
+            self.case_id or self.revision_id or self.access_grant_id or self.timeline_id
+        )
+
+    @property
+    def has_recognized_selector(self) -> bool:
+        return self.has_canonical_selector or self.has_direct_selector
+
+
+class CasesDsarProvider:
+    provider_id = "cases"
+    module_id = "cases"
+
+    def search_subject(
+        self,
+        session: object,
+        *,
+        tenant_id: str,
+        subject: DsarSubjectRef,
+    ) -> Sequence[DsarRecordRef]:
+        db = _session(session)
+        selectors = _subject_selectors(subject)
+        if selectors is None or not selectors.has_recognized_selector:
+            return ()
+
+        identities = _matching_identities(db, tenant_id, selectors)
+        revisions = _matching_revisions(db, tenant_id, selectors)
+        grants = _matching_grants(db, tenant_id, selectors)
+        timeline = _matching_timeline(db, tenant_id, selectors)
+        if _direct_reference_conflicts(
+            selectors,
+            identities=identities,
+            revisions=revisions,
+            grants=grants,
+            timeline=timeline,
+        ):
+            return ()
+
+        direct_case_ids = _direct_case_ids(
+            selectors,
+            identities=identities,
+            revisions=revisions,
+            grants=grants,
+            timeline=timeline,
+        )
+        records: list[DsarRecordRef] = []
+        seen: set[tuple[str, str]] = set()
+
+        def append(record: DsarRecordRef) -> None:
+            key = (record.resource_type, record.resource_id)
+            if key in seen:
+                return
+            if len(records) >= _MAX_RECORDS:
+                raise ValueError(
+                    "Cases DSAR result limit exceeded; narrow the subject selectors."
+                )
+            seen.add(key)
+            records.append(record)
+
+        for identity in identities:
+            if identity.case_id in direct_case_ids:
+                append(_case_identity_record(identity))
+            if identity.created_by in selectors.actor_ids:
+                append(
+                    _operator_record(
+                        resource_id=f"identity:{identity.id}",
+                        case_id=identity.case_id,
+                        activity="created_case_identity",
+                        observed_at=identity.created_at,
+                    )
+                )
+
+        for revision in revisions:
+            if _revision_is_direct(revision, selectors, direct_case_ids):
+                record = CaseRecord.from_mapping(revision.snapshot)
+                append(_revision_record(revision, record))
+                if revision.superseded_at is None and revision.closed_at is None:
+                    append(_current_fact_record(revision, record))
+            if revision.changed_by in selectors.actor_ids:
+                append(
+                    _operator_record(
+                        resource_id=f"revision:{revision.id}",
+                        case_id=revision.case_id,
+                        activity="changed_case_revision",
+                        observed_at=revision.recorded_at,
+                        case_revision=revision.revision,
+                    )
+                )
+
+        for grant in grants:
+            if _grant_subject_matches(grant, selectors) or (
+                _grant_is_direct(grant, selectors)
+                and not selectors.has_canonical_selector
+            ):
+                append(_access_grant_record(grant))
+            if grant.created_by in selectors.actor_ids:
+                append(
+                    _operator_record(
+                        resource_id=f"grant:{grant.id}",
+                        case_id=grant.case_id,
+                        activity="changed_case_access_grant",
+                        observed_at=grant.updated_at,
+                    )
+                )
+
+        for entry in timeline:
+            direct = _timeline_is_direct(entry, selectors, direct_case_ids)
+            actor_match = entry.actor_id in selectors.actor_ids
+            if direct or actor_match:
+                append(
+                    _timeline_record(
+                        entry,
+                        expose_actor=actor_match,
+                        match_fields=(
+                            (["reference"] if direct else [])
+                            + (["actor_id"] if actor_match else [])
+                        ),
+                    )
+                )
+
+        return tuple(records)
+
+    def plan_erasure(
+        self,
+        session: object,
+        *,
+        tenant_id: str,
+        subject: DsarSubjectRef,
+        records: Sequence[DsarRecordRef],
+    ) -> Sequence[DsarErasureActionRef]:
+        del tenant_id
+        _session(session)
+        if _subject_selectors(subject) is None:
+            raise ValueError("Cases DSAR subject selectors conflict.")
+        actions: list[DsarErasureActionRef] = []
+        for record in records:
+            _validate_record(record)
+            if record.immutable_evidence:
+                kind = "retain"
+                title = f"Retain {record.title}"
+                rationale = record.retention_reason or (
+                    "Case history is retained as institutional evidence."
+                )
+            else:
+                kind = "manual_review"
+                title = f"Review {record.title}"
+                rationale = (
+                    "An authorized case operator must amend, close, supersede, or "
+                    "deactivate the current fact through the governed case lifecycle "
+                    "after reviewing legal, procedural, access, and third-party effects."
+                )
+            actions.append(
+                DsarErasureActionRef(
+                    action_id=f"cases:{kind}:{record.resource_type}:{record.resource_id}",
+                    provider_id=self.provider_id,
+                    module_id=self.module_id,
+                    kind=kind,
+                    resource_type=record.resource_type,
+                    resource_id=record.resource_id,
+                    title=title,
+                    rationale=rationale,
+                    executable=False,
+                )
+            )
+        return tuple(actions)
+
+    def execute_erasure(
+        self,
+        session: object,
+        *,
+        tenant_id: str,
+        subject: DsarSubjectRef,
+        actions: Sequence[DsarErasureActionRef],
+        request_id: str,
+    ) -> Sequence[DsarExecutionResultRef]:
+        del tenant_id
+        _session(session)
+        if _subject_selectors(subject) is None:
+            raise ValueError("Cases DSAR subject selectors conflict.")
+        results: list[DsarExecutionResultRef] = []
+        for action in actions:
+            _validate_action(action)
+            if action.executable:
+                raise ValueError(
+                    "Cases DSAR does not publish executable erasure actions."
+                )
+            results.append(
+                DsarExecutionResultRef(
+                    action_id=action.action_id,
+                    status="blocked",
+                    summary=(
+                        "Use the governed case or access lifecycle after legal, "
+                        "institutional-evidence, and third-party review."
+                    ),
+                    evidence={"request_id": request_id},
+                )
+            )
+        return tuple(results)
+
+
+def _matching_identities(
+    session: Session,
+    tenant_id: str,
+    selectors: _SubjectSelectors,
+) -> list[CaseIdentity]:
+    conditions = []
+    if selectors.actor_ids:
+        conditions.append(CaseIdentity.created_by.in_(selectors.actor_ids))
+    if selectors.case_id:
+        conditions.append(CaseIdentity.case_id == selectors.case_id)
+    return _query_conditions(session, CaseIdentity, tenant_id, conditions)
+
+
+def _matching_revisions(
+    session: Session,
+    tenant_id: str,
+    selectors: _SubjectSelectors,
+) -> list[CaseRecordRevision]:
+    conditions = []
+    if selectors.actor_ids:
+        conditions.append(CaseRecordRevision.changed_by.in_(selectors.actor_ids))
+    if selectors.case_id:
+        conditions.append(CaseRecordRevision.case_id == selectors.case_id)
+    if selectors.revision_id:
+        conditions.append(CaseRecordRevision.id == selectors.revision_id)
+    return _query_conditions(session, CaseRecordRevision, tenant_id, conditions)
+
+
+def _matching_grants(
+    session: Session,
+    tenant_id: str,
+    selectors: _SubjectSelectors,
+) -> list[CaseAccessGrant]:
+    conditions = []
+    for kind, value in (
+        ("account", selectors.account_id),
+        ("identity", selectors.identity_id),
+    ):
+        if value:
+            conditions.append(
+                (CaseAccessGrant.subject_kind == kind)
+                & (CaseAccessGrant.subject_id == value)
+            )
+    if selectors.actor_ids:
+        conditions.append(CaseAccessGrant.created_by.in_(selectors.actor_ids))
+    if selectors.case_id:
+        conditions.append(CaseAccessGrant.case_id == selectors.case_id)
+    if selectors.access_grant_id:
+        conditions.append(CaseAccessGrant.id == selectors.access_grant_id)
+    return _query_conditions(session, CaseAccessGrant, tenant_id, conditions)
+
+
+def _matching_timeline(
+    session: Session,
+    tenant_id: str,
+    selectors: _SubjectSelectors,
+) -> list[CaseTimelineEntry]:
+    conditions = []
+    if selectors.actor_ids:
+        conditions.append(CaseTimelineEntry.actor_id.in_(selectors.actor_ids))
+    if selectors.case_id:
+        conditions.append(CaseTimelineEntry.case_id == selectors.case_id)
+    if selectors.timeline_id:
+        conditions.append(CaseTimelineEntry.id == selectors.timeline_id)
+    return _query_conditions(session, CaseTimelineEntry, tenant_id, conditions)
+
+
+def _direct_reference_conflicts(
+    selectors: _SubjectSelectors,
+    *,
+    identities: Sequence[CaseIdentity],
+    revisions: Sequence[CaseRecordRevision],
+    grants: Sequence[CaseAccessGrant],
+    timeline: Sequence[CaseTimelineEntry],
+) -> bool:
+    referenced_case_ids: list[str] = []
+    if selectors.case_id:
+        if not any(row.case_id == selectors.case_id for row in identities):
+            return True
+        referenced_case_ids.append(selectors.case_id)
+    if selectors.revision_id:
+        row = next(
+            (item for item in revisions if item.id == selectors.revision_id), None
+        )
+        if row is None:
+            return True
+        referenced_case_ids.append(row.case_id)
+    if selectors.access_grant_id:
+        row = next(
+            (item for item in grants if item.id == selectors.access_grant_id), None
+        )
+        if row is None:
+            return True
+        if selectors.has_canonical_selector and not _grant_subject_matches(
+            row, selectors
+        ):
+            return True
+        referenced_case_ids.append(row.case_id)
+    if selectors.timeline_id:
+        row = next(
+            (item for item in timeline if item.id == selectors.timeline_id), None
+        )
+        if row is None:
+            return True
+        if selectors.has_canonical_selector and row.actor_id not in selectors.actor_ids:
+            return True
+        referenced_case_ids.append(row.case_id)
+    if len(set(referenced_case_ids)) > 1:
+        return True
+    if not selectors.has_canonical_selector or not referenced_case_ids:
+        return False
+    related_case_ids = {
+        row.case_id for row in identities if row.created_by in selectors.actor_ids
+    }
+    related_case_ids.update(
+        row.case_id for row in revisions if row.changed_by in selectors.actor_ids
+    )
+    related_case_ids.update(
+        row.case_id for row in grants if _grant_subject_matches(row, selectors)
+    )
+    related_case_ids.update(
+        row.case_id for row in timeline if row.actor_id in selectors.actor_ids
+    )
+    return referenced_case_ids[0] not in related_case_ids
+
+
+def _direct_case_ids(
+    selectors: _SubjectSelectors,
+    *,
+    identities: Sequence[CaseIdentity],
+    revisions: Sequence[CaseRecordRevision],
+    grants: Sequence[CaseAccessGrant],
+    timeline: Sequence[CaseTimelineEntry],
+) -> set[str]:
+    values = {selectors.case_id} if selectors.case_id else set()
+    values.update(row.case_id for row in revisions if row.id == selectors.revision_id)
+    values.update(row.case_id for row in grants if row.id == selectors.access_grant_id)
+    values.update(row.case_id for row in timeline if row.id == selectors.timeline_id)
+    values.update(
+        row.case_id
+        for row in identities
+        if selectors.case_id and row.case_id == selectors.case_id
+    )
+    return {value for value in values if value}
+
+
+def _revision_is_direct(
+    row: CaseRecordRevision,
+    selectors: _SubjectSelectors,
+    direct_case_ids: set[str],
+) -> bool:
+    if selectors.revision_id:
+        return row.id == selectors.revision_id
+    return bool(selectors.case_id and row.case_id in direct_case_ids)
+
+
+def _grant_is_direct(
+    row: CaseAccessGrant,
+    selectors: _SubjectSelectors,
+) -> bool:
+    return bool(selectors.access_grant_id and row.id == selectors.access_grant_id)
+
+
+def _timeline_is_direct(
+    row: CaseTimelineEntry,
+    selectors: _SubjectSelectors,
+    direct_case_ids: set[str],
+) -> bool:
+    if selectors.timeline_id:
+        return row.id == selectors.timeline_id
+    return bool(selectors.case_id and row.case_id in direct_case_ids)
+
+
+def _grant_subject_matches(
+    row: CaseAccessGrant,
+    selectors: _SubjectSelectors,
+) -> bool:
+    return bool(
+        (row.subject_kind == "account" and row.subject_id == selectors.account_id)
+        or (row.subject_kind == "identity" and row.subject_id == selectors.identity_id)
+    )
+
+
+def _case_identity_record(row: CaseIdentity) -> DsarRecordRef:
+    return _record(
+        "cases_case_identity",
+        row.id,
+        "case_identity",
+        "Case identity",
+        {
+            "match_fields": ["reference"],
+            "case_id": row.case_id,
+            "case_number": _bounded_text(row.case_number, 255),
+            "created_at": _iso(row.created_at),
+        },
+        observed_at=row.created_at,
+        immutable=True,
+        retention_reason=(
+            "The stable case identifier and number are retained so immutable case and "
+            "record evidence remains reconstructable."
+        ),
+    )
+
+
+def _revision_record(
+    row: CaseRecordRevision,
+    record: CaseRecord,
+) -> DsarRecordRef:
+    return _record(
+        "cases_case_revision",
+        row.id,
+        "case_history",
+        "Case revision",
+        {
+            "match_fields": ["reference"],
+            "case_id": row.case_id,
+            "case_number": _bounded_text(record.case_number, 255),
+            "revision": row.revision,
+            "previous_revision_id": row.previous_revision_id,
+            "case_type_key": row.case_type_key,
+            "status_key": row.status_key,
+            "title": _bounded_text(row.title, 500),
+            "access_mode": row.access_mode,
+            "opened_at": _iso(row.opened_at),
+            "deadline_at": _iso(row.deadline_at),
+            "closed_at": _iso(row.closed_at),
+            "recorded_at": _iso(row.recorded_at),
+            "superseded_at": _iso(row.superseded_at),
+            "service_ref": _institutional_reference(record.service_ref),
+            "party_reference_count": len(record.party_refs),
+            "assignment_reference_count": len(record.assignment_refs),
+            "evidence_reference_count": len(record.evidence_refs),
+            "decision_reference_count": len(record.decision_refs),
+            "record_reference_count": len(record.record_refs),
+            "access_grant_count": len(record.access_grants),
+        },
+        observed_at=row.recorded_at,
+        immutable=True,
+        retention_reason=(
+            "Case revisions are immutable procedure and accountability evidence; "
+            "corrections append a new governed revision."
+        ),
+    )
+
+
+def _current_fact_record(
+    row: CaseRecordRevision,
+    record: CaseRecord,
+) -> DsarRecordRef:
+    return _record(
+        "cases_current_case_fact",
+        row.case_id,
+        "current_case_fact",
+        "Current case fact",
+        {
+            "match_fields": ["reference"],
+            "revision_record_id": row.id,
+            "revision": row.revision,
+            "case_number": _bounded_text(record.case_number, 255),
+            "status_key": row.status_key,
+            "title": _bounded_text(row.title, 500),
+            "deadline_at": _iso(row.deadline_at),
+        },
+        observed_at=row.recorded_at,
+    )
+
+
+def _access_grant_record(row: CaseAccessGrant) -> DsarRecordRef:
+    immutable = not row.active
+    return _record(
+        "cases_access_grant",
+        row.id,
+        "case_access_fact",
+        "Case access grant",
+        {
+            "match_fields": ["subject"],
+            "case_id": row.case_id,
+            "subject_kind": row.subject_kind,
+            "subject_id": row.subject_id,
+            "permissions": [str(value)[:40] for value in row.permissions[:20]],
+            "source": _bounded_text(row.source, 30),
+            "active": row.active,
+            "source_revision": row.source_revision,
+            "created_at": _iso(row.created_at),
+            "updated_at": _iso(row.updated_at),
+        },
+        observed_at=row.updated_at,
+        immutable=immutable,
+        retention_reason=(
+            "Inactive access-grant state is retained to explain historical case access."
+            if immutable
+            else None
+        ),
+    )
+
+
+def _timeline_record(
+    row: CaseTimelineEntry,
+    *,
+    expose_actor: bool,
+    match_fields: Sequence[str],
+) -> DsarRecordRef:
+    return _record(
+        "cases_timeline_event",
+        row.id,
+        "case_lifecycle_evidence",
+        "Case lifecycle event",
+        {
+            "match_fields": list(match_fields),
+            "case_id": row.case_id,
+            "event_type": _bounded_text(row.event_type, 120),
+            "case_revision": row.case_revision,
+            "occurred_at": _iso(row.occurred_at),
+            "actor_id": row.actor_id if expose_actor else None,
+        },
+        observed_at=row.occurred_at,
+        immutable=True,
+        retention_reason=(
+            "Case timeline events are immutable lifecycle and accountability evidence."
+        ),
+    )
+
+
+def _operator_record(
+    *,
+    resource_id: str,
+    case_id: str,
+    activity: str,
+    observed_at: datetime | None,
+    case_revision: int | None = None,
+) -> DsarRecordRef:
+    return _record(
+        "cases_operator_attribution",
+        resource_id,
+        "operator_accountability_evidence",
+        "Case operator attribution",
+        {
+            "match_fields": ["actor_id"],
+            "case_id": case_id,
+            "activity": activity,
+            "case_revision": case_revision,
+            "observed_at": _iso(observed_at),
+        },
+        observed_at=observed_at,
+        immutable=True,
+        retention_reason=(
+            "Operator attribution is retained as accountability evidence; raw case, "
+            "party, evidence, change-reason, and event payload content is excluded."
+        ),
+    )
+
+
+def _subject_selectors(subject: DsarSubjectRef) -> _SubjectSelectors | None:
+    groups = {
+        "account_id": (
+            subject.account_id,
+            subject.external_references.get("cases.account"),
+            subject.external_references.get("access.account"),
+        ),
+        "identity_id": (
+            subject.identity_id,
+            subject.external_references.get("cases.identity"),
+            subject.external_references.get("identity.id"),
+        ),
+        "membership_id": (
+            subject.membership_id,
+            subject.external_references.get("cases.membership"),
+            subject.external_references.get("tenancy.membership"),
+        ),
+        "case_id": (subject.external_references.get("cases.case"),),
+        "revision_id": (subject.external_references.get("cases.revision"),),
+        "access_grant_id": (subject.external_references.get("cases.access_grant"),),
+        "timeline_id": (subject.external_references.get("cases.timeline"),),
+    }
+    normalized: dict[str, str | None] = {}
+    for key, values in groups.items():
+        distinct = {value for item in values if (value := _normalized_id(item))}
+        if len(distinct) > 1:
+            return None
+        normalized[key] = next(iter(distinct), None)
+    return _SubjectSelectors(**normalized)
+
+
+def _query_conditions(
+    session: Session,
+    model: type,
+    tenant_id: str,
+    conditions: Sequence[object],
+) -> list[object]:
+    if not conditions:
+        return []
+    rows = (
+        session.query(model)
+        .filter(model.tenant_id == tenant_id, or_(*conditions))
+        .order_by(model.id.asc())
+        .limit(_MAX_RECORDS + 1)
+        .all()
+    )
+    if len(rows) > _MAX_RECORDS:
+        raise ValueError("Cases DSAR match limit exceeded; narrow the selectors.")
+    return rows
+
+
+def _institutional_reference(value: object | None) -> dict[str, object] | None:
+    if value is None:
+        return None
+    return {
+        "kind": str(getattr(value, "kind", "")),
+        "owner_module": str(getattr(value, "owner_module", "")),
+        "object_id": str(getattr(value, "object_id", "")),
+        "version": _bounded_text(getattr(value, "version", None), 120),
+    }
+
+
+def _validate_record(record: DsarRecordRef) -> None:
+    if record.provider_id != "cases" or record.module_id != "cases":
+        raise ValueError("Cases DSAR received a foreign provider record.")
+
+
+def _validate_action(action: DsarErasureActionRef) -> None:
+    if action.provider_id != "cases" or action.module_id != "cases":
+        raise ValueError("Cases DSAR received a foreign provider action.")
+
+
+def _record(
+    resource_type: str,
+    resource_id: str,
+    category: str,
+    title: str,
+    data: Mapping[str, object],
+    *,
+    observed_at: datetime | None,
+    immutable: bool = False,
+    retention_reason: str | None = None,
+) -> DsarRecordRef:
+    return DsarRecordRef(
+        provider_id="cases",
+        module_id="cases",
+        resource_type=resource_type,
+        resource_id=resource_id,
+        category=category,
+        title=title,
+        data=data,
+        observed_at=observed_at,
+        immutable_evidence=immutable,
+        retention_reason=retention_reason,
+        source_path="/cases",
+    )
+
+
+def _session(value: object) -> Session:
+    if not isinstance(value, Session):
+        raise TypeError("Cases DSAR provider requires a SQLAlchemy session.")
+    return value
+
+
+def _bounded_text(value: str | None, limit: int) -> str | None:
+    return value[:limit] if value else None
+
+
+def _normalized_id(value: object) -> str | None:
+    if value is None:
+        return None
+    normalized = str(value).strip()
+    return normalized or None
+
+
+def _iso(value: datetime | None) -> str | None:
+    if value is None:
+        return None
+    if value.tzinfo is None:
+        value = value.replace(tzinfo=timezone.utc)
+    return value.isoformat()
+
+
+__all__ = ["CASES_DSAR_CAPABILITY", "CasesDsarProvider"]

src/govoplan_cases/backend/evidence_links.py

@@ -0,0 +1,239 @@
+from __future__ import annotations
+
+from collections.abc import Mapping
+from datetime import datetime
+import hashlib
+import json
+from urllib.parse import parse_qs, quote, urlsplit
+
+from sqlalchemy.orm import Session
+
+from govoplan_core.core.institutional import EvidenceReference
+from govoplan_cases.backend.domain import CaseRecord
+from govoplan_cases.backend.service import CaseStoreError, get_case, update_case
+
+
+_SOURCE_CONTRACT = "cases.quick-access-reference.v1"
+_SUPPORTED_REFERENCES = {
+    ("files", "file-version"): "document",
+    ("mail", "message"): "event",
+    ("campaigns", "campaign"): "event",
+}
+
+
+def link_case_evidence(
+    session: Session,
+    principal: object,
+    *,
+    case_id: str,
+    expected_revision: int,
+    reference: Mapping[str, object],
+    recorded_at: datetime,
+    change_reason: str,
+    idempotency_key: str,
+) -> CaseRecord:
+    base = _base_revision(
+        session,
+        principal,
+        case_id=case_id,
+        expected_revision=expected_revision,
+    )
+    evidence = _validated_evidence(reference, tenant_id=base.reference.tenant_id)
+    if any(item.evidence_id == evidence.evidence_id for item in base.evidence_refs):
+        raise CaseStoreError("The owner reference is already linked to this Case.")
+    return update_case(
+        session,
+        principal,
+        case_id=case_id,
+        expected_revision=expected_revision,
+        changes={"evidence_refs": (*base.evidence_refs, evidence)},
+        recorded_at=recorded_at,
+        change_reason=change_reason,
+        idempotency_key=idempotency_key,
+    )
+
+
+def unlink_case_evidence(
+    session: Session,
+    principal: object,
+    *,
+    case_id: str,
+    evidence_id: str,
+    expected_revision: int,
+    recorded_at: datetime,
+    change_reason: str,
+    idempotency_key: str,
+) -> CaseRecord:
+    base = _base_revision(
+        session,
+        principal,
+        case_id=case_id,
+        expected_revision=expected_revision,
+    )
+    evidence = next(
+        (item for item in base.evidence_refs if item.evidence_id == evidence_id),
+        None,
+    )
+    if evidence is None or linked_source(evidence) is None:
+        raise CaseStoreError("The linked owner reference was not found.")
+    return update_case(
+        session,
+        principal,
+        case_id=case_id,
+        expected_revision=expected_revision,
+        changes={
+            "evidence_refs": tuple(
+                item for item in base.evidence_refs if item.evidence_id != evidence_id
+            )
+        },
+        recorded_at=recorded_at,
+        change_reason=change_reason,
+        idempotency_key=idempotency_key,
+    )
+
+
+def linked_source(evidence: EvidenceReference) -> Mapping[str, str] | None:
+    if evidence.source_ref is None:
+        return None
+    try:
+        value = json.loads(evidence.source_ref)
+    except (TypeError, ValueError):
+        return None
+    if not isinstance(value, Mapping) or value.get("contract") != _SOURCE_CONTRACT:
+        return None
+    result = {
+        key: str(value.get(key) or "")
+        for key in ("owner_module", "kind", "object_id", "path")
+    }
+    if (
+        not all(result.values())
+        or (result["owner_module"], result["kind"]) not in _SUPPORTED_REFERENCES
+    ):
+        return None
+    return result
+
+
+def _base_revision(
+    session: Session,
+    principal: object,
+    *,
+    case_id: str,
+    expected_revision: int,
+) -> CaseRecord:
+    base = get_case(
+        session,
+        principal,
+        case_id=case_id,
+        revision=expected_revision,
+    )
+    if base is None:
+        raise LookupError("Case revision not found.")
+    return base
+
+
+def _validated_evidence(
+    value: Mapping[str, object],
+    *,
+    tenant_id: str,
+) -> EvidenceReference:
+    owner_module = _bounded(value.get("owner_module"), "Owner module", 120)
+    reference_kind = _bounded(value.get("kind"), "Owner reference kind", 120)
+    object_id = _bounded(value.get("object_id"), "Owner object id", 1_000)
+    reference_tenant = _bounded(value.get("tenant_id"), "Owner tenant id", 255)
+    version = _bounded(value.get("version"), "Owner version", 255)
+    path = _bounded(value.get("path"), "Owner path", 2_000)
+    evidence_kind = _SUPPORTED_REFERENCES.get((owner_module, reference_kind))
+    if evidence_kind is None:
+        raise CaseStoreError("The owner reference kind is not supported by Cases.")
+    if reference_tenant != tenant_id:
+        raise CaseStoreError("Owner references cannot cross Case tenants.")
+    _validate_owner_path(
+        owner_module=owner_module,
+        reference_kind=reference_kind,
+        object_id=object_id,
+        version=version,
+        path=path,
+    )
+    canonical = {
+        "contract": _SOURCE_CONTRACT,
+        "owner_module": owner_module,
+        "kind": reference_kind,
+        "object_id": object_id,
+        "path": path,
+    }
+    encoded = json.dumps(
+        canonical,
+        ensure_ascii=True,
+        sort_keys=True,
+        separators=(",", ":"),
+    )
+    digest = hashlib.sha256(
+        f"{tenant_id}\x1f{encoded}\x1f{version}".encode()
+    ).hexdigest()
+    return EvidenceReference(
+        kind=evidence_kind,  # type: ignore[arg-type]
+        owner_module=owner_module,
+        evidence_id=f"linked-{digest[:40]}",
+        tenant_id=tenant_id,
+        version=version,
+        source_ref=encoded,
+        derived_from=(_SOURCE_CONTRACT,),
+    )
+
+
+def _validate_owner_path(
+    *,
+    owner_module: str,
+    reference_kind: str,
+    object_id: str,
+    version: str,
+    path: str,
+) -> None:
+    parsed = urlsplit(path)
+    if parsed.scheme or parsed.netloc or not path.startswith("/") or path.startswith("//"):
+        raise CaseStoreError("Owner paths must be local platform routes.")
+    if (owner_module, reference_kind) == ("files", "file-version"):
+        query = parse_qs(parsed.query, keep_blank_values=True)
+        if (
+            parsed.path != "/files"
+            or query.get("versionId") != [object_id]
+            or version != object_id
+            or not query.get("fileId", [""])[0]
+        ):
+            raise CaseStoreError("Files links require an exact authorized version path.")
+        return
+    if (owner_module, reference_kind) == ("mail", "message"):
+        query = parse_qs(parsed.query, keep_blank_values=True)
+        profile = query.get("profile", [""])[0]
+        folder = query.get("folder", [""])[0]
+        message = query.get("message", [""])[0]
+        expected_id = f"{profile}:{folder}:{message}"
+        if (
+            parsed.path != "/mail"
+            or not profile
+            or not folder
+            or not message
+            or object_id != expected_id
+            or version != message
+        ):
+            raise CaseStoreError("Mail links require an exact mailbox message path.")
+        return
+    expected_path = f"/campaigns/{quote(object_id, safe='')}"
+    if path != expected_path:
+        raise CaseStoreError("Campaign links require an exact Campaign path.")
+
+
+def _bounded(value: object, label: str, maximum: int) -> str:
+    result = str(value or "").strip()
+    if not result:
+        raise CaseStoreError(f"{label} is required.")
+    if len(result) > maximum or any(ord(character) < 32 for character in result):
+        raise CaseStoreError(f"{label} is invalid.")
+    return result
+
+
+__all__ = [
+    "link_case_evidence",
+    "linked_source",
+    "unlink_case_evidence",
+]

src/govoplan_cases/backend/german_structured_documentation.py

@@ -0,0 +1,100 @@
+"""German translations for public structured documentation metadata."""
+
+from __future__ import annotations
+
+from typing import Any
+
+
+GERMAN_STRUCTURED_TRANSLATIONS: dict[str, dict[str, Any]] = {'cases.reference.lifecycle-access-and-evidence': {'consequence_classes': {'change_access': 'Beifügen '
+                                                                                            'eines '
+                                                                                            'bestätigten '
+                                                                                            'Ereignisses '
+                                                                                            'hinsichtlich '
+                                                                                            'der '
+                                                                                            'Sichtbarkeit/der '
+                                                                                            'Überarbeitung '
+                                                                                            'der '
+                                                                                            'Finanzhilfe '
+                                                                                            'und '
+                                                                                            'des '
+                                                                                            'Zeitplans',
+                                                                           'close_case': 'Anfügen '
+                                                                                         'einer '
+                                                                                         'Terminalrevision '
+                                                                                         'nach '
+                                                                                         'Close-Scope-Autorisierung',
+                                                                           'update_case': 'Anfügen '
+                                                                                          'eines '
+                                                                                          'OCC-geschützten '
+                                                                                          'unveränderlichen '
+                                                                                          'Revisions- '
+                                                                                          'und '
+                                                                                          'Zeitleistenereignisses'}},
+ 'cases.workflow.file-exact-revision': {'outcome': 'Der eAkte behält eine genaue '
+                                                   'Fall-Snapshot-Referenz, während Cases die '
+                                                   'Autorität behält.',
+                                        'prerequisites': ['Sie können derzeit den Fall lesen und '
+                                                          'Elemente in den Zieldatensatz eingeben.',
+                                                          'Die genaue Revision des '
+                                                          'unveränderlichen Falles wurde '
+                                                          'ermittelt.'],
+                                        'steps': ['Öffnen Sie den Fall und identifizieren Sie die '
+                                                  'Revision, die den Beweiszustand darstellt.',
+                                                  'Wählen Sie den Zieldatensatz und geben Sie den '
+                                                  'Zugangszweck und den Anmeldegrund an.',
+                                                  'Bestätigen Sie die Einreichung; Cases überprüft '
+                                                  'den aktuellen Zugriff erneut und löst die '
+                                                  'genaue Überarbeitung.',
+                                                  'Überprüfen Sie die Fallrevision und Snapshot '
+                                                  'Digest in der Datensatzchronologie.']},
+ 'cases.workflow.link-owner-references': {'consequence_classes': {'link_owner_reference': 'Eine '
+                                                                                          'unveränderliche '
+                                                                                          'Fallrevision, '
+                                                                                          'die nur '
+                                                                                          'die '
+                                                                                          'genaue '
+                                                                                          'typisierte '
+                                                                                          'Eigentümerreferenz '
+                                                                                          'enthält.',
+                                                                  'unlink_owner_reference': 'Hängt '
+                                                                                            'eine '
+                                                                                            'unveränderliche '
+                                                                                            'Case-Revision '
+                                                                                            'an '
+                                                                                            'und '
+                                                                                            'lässt '
+                                                                                            'das '
+                                                                                            'Owner-Objekt '
+                                                                                            'unverändert.'}},
+ 'cases.workflow.record-formal-decision': {'outcome': 'Das formale Ergebnis ist '
+                                                      'Entscheidungsbesitz und exakte Version aus '
+                                                      'dem Fall verknüpft.',
+                                           'prerequisites': ['Der Fall hat eine genaue '
+                                                             'verantwortliche Organisation, '
+                                                             'Funktion, Nachweise und rechtliche '
+                                                             'Grundlage Version.',
+                                                             'Eine aktive Handlungszuweisung und '
+                                                             'genau ein wirksames Mandat '
+                                                             'autorisieren den Entscheidungstyp.'],
+                                           'steps': ['Öffnen Sie den Fall und wählen Sie die '
+                                                     'entsprechende Handlungszuweisung in der '
+                                                     'Titelleiste aus.',
+                                                     'Notieren Sie das operative Ergebnis, die '
+                                                     'Begründung, die optionalen Bedingungen, die '
+                                                     'effektive Zeit und den Änderungsgrund.',
+                                                     'Bestätigen Sie die genauen Entscheidungs- '
+                                                     'und Fallrevisionen in der Fallzeitleiste.',
+                                                     'Wenn Records aktiviert ist, archivieren Sie '
+                                                     'die genaue Entscheidungs- oder Fallrevision '
+                                                     'im Zielort eAkte.']},
+ 'cases.workflow.ticket-escalation': {'consequence_classes': {'create_case': 'Erstellt ein '
+                                                                             'Fall-eigenes '
+                                                                             'formales Verfahren '
+                                                                             'und gibt seine '
+                                                                             'stabile Referenz '
+                                                                             'zurück.',
+                                                              'preserve_ticket': 'Konvertiert, '
+                                                                                 'kopiert oder '
+                                                                                 'verändert den '
+                                                                                 'Ticketverlauf '
+                                                                                 'nicht.'}}}

src/govoplan_cases/backend/manifest.py

@@ -1,14 +1,23 @@
 from __future__ import annotations
 
+from govoplan_core.core.modules import with_documentation_structured_translations
+from govoplan_cases.backend.german_structured_documentation import GERMAN_STRUCTURED_TRANSLATIONS
+
 from pathlib import Path
 
 from govoplan_core.core.module_guards import (
     drop_table_retirement_provider,
     persistent_table_uninstall_guard,
 )
-from govoplan_core.core.institutional import CAPABILITY_PARTY_RESOLVER
+from govoplan_core.core.access import CAPABILITY_ACCESS_SEMANTIC_DIRECTORY
+from govoplan_core.core.institutional import (
+    CAPABILITY_DECISION_REGISTRY,
+    CAPABILITY_MANDATE_RESOLVER,
+    CAPABILITY_PARTY_RESOLVER,
+)
 from govoplan_core.core.modules import (
     CapabilityDocumentation,
+    DocumentationCondition,
     DocumentationLink,
     DocumentationTopic,
     FrontendModule,
@@ -20,9 +29,12 @@ from govoplan_core.core.modules import (
     ModuleManifest,
     NavItem,
     PermissionDefinition,
+    ProductAreaContribution,
     RoleTemplate,
 )
 from govoplan_core.core.views import ViewSurface
+from govoplan_core.core.search import SearchSourceProviderRegistration
+from govoplan_core.core.tickets import CAPABILITY_TICKET_CASE_ESCALATION
 from govoplan_core.core.provider_governance import (
     ModuleArchitectureDeclaration,
     ModuleArchitectureDocumentation,
@@ -34,6 +46,10 @@ from govoplan_cases.backend.party_context import (
 )
 from govoplan_cases.backend.acl import CaseAclProvider
 from govoplan_cases.backend.db import models as case_models
+from govoplan_cases.backend.dsar_provider import (
+    CASES_DSAR_CAPABILITY,
+    CasesDsarProvider,
+)
 from govoplan_cases.backend.service_intake import (
     CAPABILITY_CASES_SERVICE_INTAKE,
     CaseServiceIntake,
@@ -46,11 +62,17 @@ from govoplan_cases.backend.service import (
     CAPABILITY_CASES_REGISTRY,
     SqlCaseRegistry,
 )
+from govoplan_cases.backend.record_source import (
+    CAPABILITY_RECORD_SOURCE_CASES,
+    create_cases_record_source,
+)
+from govoplan_cases.backend.search_source import create_cases_search_source
+from govoplan_cases.backend.ticket_escalation import TicketCaseEscalationProvider
 from govoplan_core.db.base import Base
 
 
 MODULE_ID = "cases"
-MODULE_VERSION = "0.1.15"
+MODULE_VERSION = "0.1.22"
 READ_SCOPE = "cases:case:read"
 CREATE_SCOPE = "cases:case:create"
 UPDATE_SCOPE = "cases:case:update"
@@ -79,6 +101,15 @@ def _service_launcher(context: ModuleContext) -> CaseServiceLauncher:
     return CaseServiceLauncher()
 
 
+def _dsar_provider(context: ModuleContext) -> CasesDsarProvider:
+    del context
+    return CasesDsarProvider()
+
+
+def _ticket_escalation(_context: ModuleContext) -> TicketCaseEscalationProvider:
+    return TicketCaseEscalationProvider()
+
+
 def _router(context: ModuleContext):
     del context
     from govoplan_cases.backend.router import router
@@ -131,23 +162,60 @@ manifest = ModuleManifest(
         "decisions",
         "forms_runtime",
         "workflow_engine",
+        "records",
+        "files",
+        "mail",
+        "campaigns",
+        "quick_access",
+    ),
+    optional_capabilities=(
+        CAPABILITY_PARTY_RESOLVER,
+        CAPABILITY_ACCESS_SEMANTIC_DIRECTORY,
+        CAPABILITY_MANDATE_RESOLVER,
+        CAPABILITY_DECISION_REGISTRY,
     ),
-    optional_capabilities=(CAPABILITY_PARTY_RESOLVER,),
     permissions=(
-        _permission(READ_SCOPE, "View cases", "Read tenant cases and their governed history."),
+        _permission(
-        _permission(CREATE_SCOPE, "Create cases", "Open a case from a configured case type or service intake."),
+            READ_SCOPE, "View cases", "Read tenant cases and their governed history."
-        _permission(UPDATE_SCOPE, "Update cases", "Create a guarded immutable case revision."),
+        ),
-        _permission(ASSIGN_SCOPE, "Assign cases", "Change stable function, assignment, or work-item references on a case."),
+        _permission(
-        _permission(CLOSE_SCOPE, "Close cases", "Move a case to a configured terminal status."),
+            CREATE_SCOPE,
-        _permission(SHARE_SCOPE, "Share cases", "Restrict a case and grant object-level access to selected principals."),
+            "Create cases",
-        _permission(ADMIN_SCOPE, "Administer cases", "Configure tenant case types and statuses."),
+            "Open a case from a configured case type or service intake.",
+        ),
+        _permission(
+            UPDATE_SCOPE, "Update cases", "Create a guarded immutable case revision."
+        ),
+        _permission(
+            ASSIGN_SCOPE,
+            "Assign cases",
+            "Change stable function, assignment, or work-item references on a case.",
+        ),
+        _permission(
+            CLOSE_SCOPE, "Close cases", "Move a case to a configured terminal status."
+        ),
+        _permission(
+            SHARE_SCOPE,
+            "Share cases",
+            "Restrict a case and grant object-level access to selected principals.",
+        ),
+        _permission(
+            ADMIN_SCOPE, "Administer cases", "Configure tenant case types and statuses."
+        ),
     ),
     role_templates=(
         RoleTemplate(
             slug="case_manager",
             name="Case manager",
             description="Create, assign, update, and close tenant cases.",
-            permissions=(READ_SCOPE, CREATE_SCOPE, UPDATE_SCOPE, ASSIGN_SCOPE, CLOSE_SCOPE, SHARE_SCOPE),
+            permissions=(
+                READ_SCOPE,
+                CREATE_SCOPE,
+                UPDATE_SCOPE,
+                ASSIGN_SCOPE,
+                CLOSE_SCOPE,
+                SHARE_SCOPE,
+            ),
         ),
         RoleTemplate(
             slug="case_reader",
@@ -159,7 +227,15 @@ manifest = ModuleManifest(
             slug="case_administrator",
             name="Case administrator",
             description="Configure case types and statuses and manage cases.",
-            permissions=(READ_SCOPE, CREATE_SCOPE, UPDATE_SCOPE, ASSIGN_SCOPE, CLOSE_SCOPE, SHARE_SCOPE, ADMIN_SCOPE),
+            permissions=(
+                READ_SCOPE,
+                CREATE_SCOPE,
+                UPDATE_SCOPE,
+                ASSIGN_SCOPE,
+                CLOSE_SCOPE,
+                SHARE_SCOPE,
+                ADMIN_SCOPE,
+            ),
         ),
     ),
     route_factory=_router,
@@ -198,6 +274,21 @@ manifest = ModuleManifest(
                 order=35,
             ),
         ),
+        product_areas=(
+            ProductAreaContribution(
+                id="services-cases",
+                module_id=MODULE_ID,
+                label="i18n:govoplan-core.product_area.services_cases",
+                icon="landmark",
+                description="i18n:govoplan-core.product_area.services_cases_description",
+                surface_ids=(
+                    "cases.nav.cases",
+                    "cases.route.cases",
+                    "cases.route.cases.caseid",
+                ),
+                order=20,
+            ),
+        ),
         view_surfaces=(
             ViewSurface(
                 id="cases.navigation",
@@ -276,6 +367,14 @@ manifest = ModuleManifest(
                 parent_id="cases.detail",
                 order=60,
             ),
+            ViewSurface(
+                id="cases.detail.decision",
+                module_id=MODULE_ID,
+                kind="action",
+                label="Prepare formal decision",
+                parent_id="cases.detail",
+                order=70,
+            ),
         ),
     ),
     provides_interfaces=(
@@ -283,17 +382,52 @@ manifest = ModuleManifest(
         ModuleInterfaceProvider(name="cases.party_context", version="0.1.0"),
         ModuleInterfaceProvider(name="cases.registry", version="0.1.0"),
         ModuleInterfaceProvider(name="cases.service_launcher", version="0.1.0"),
+        ModuleInterfaceProvider(name=CAPABILITY_RECORD_SOURCE_CASES, version="1.0.0"),
+        ModuleInterfaceProvider(name=CASES_DSAR_CAPABILITY, version="0.1.0"),
+        ModuleInterfaceProvider(
+            name=CAPABILITY_TICKET_CASE_ESCALATION, version="1.0.0"
+        ),
     ),
     requires_interfaces=(
-        ModuleInterfaceRequirement(name="services.definition", version_min="0.1.0", version_max_exclusive="0.2.0", optional=True),
+        ModuleInterfaceRequirement(
-        ModuleInterfaceRequirement(name="parties.procedure", version_min="0.1.0", version_max_exclusive="0.2.0", optional=True),
+            name="services.definition",
-        ModuleInterfaceRequirement(name="parties.representation", version_min="0.1.0", version_max_exclusive="0.2.0", optional=True),
+            version_min="0.1.0",
+            version_max_exclusive="0.2.0",
+            optional=True,
+        ),
+        ModuleInterfaceRequirement(
+            name="parties.procedure",
+            version_min="0.1.0",
+            version_max_exclusive="0.2.0",
+            optional=True,
+        ),
+        ModuleInterfaceRequirement(
+            name="parties.representation",
+            version_min="0.1.0",
+            version_max_exclusive="0.2.0",
+            optional=True,
+        ),
+        ModuleInterfaceRequirement(
+            name="mandates.resolution",
+            version_min="0.1.0",
+            version_max_exclusive="0.2.0",
+            optional=True,
+        ),
+        ModuleInterfaceRequirement(
+            name="decisions.formal_outcome",
+            version_min="0.1.0",
+            version_max_exclusive="0.2.0",
+            optional=True,
+        ),
     ),
     capability_factories={
         CAPABILITY_CASES_SERVICE_INTAKE: _service_intake,
         CAPABILITY_CASES_PARTY_CONTEXT: _party_context,
         CAPABILITY_CASES_REGISTRY: _case_registry,
         CAPABILITY_CASES_SERVICE_LAUNCHER: _service_launcher,
+        CAPABILITY_RECORD_SOURCE_CASES: create_cases_record_source,
+        CASES_DSAR_CAPABILITY: _dsar_provider,
+        CAPABILITY_TICKET_CASE_ESCALATION: _ticket_escalation,
     },
     capability_documentation={
         CAPABILITY_CASES_SERVICE_INTAKE: CapabilityDocumentation(
@@ -316,6 +450,21 @@ manifest = ModuleManifest(
             summary="Starts a replay-safe case from an exact available Service revision.",
             contract_version="0.1.0",
         ),
+        CAPABILITY_RECORD_SOURCE_CASES: CapabilityDocumentation(
+            label="Cases record source",
+            summary="Resolves currently authorized immutable case revisions for Records filing.",
+            contract_version="1.0.0",
+        ),
+        CASES_DSAR_CAPABILITY: CapabilityDocumentation(
+            label="Cases data-subject request provider",
+            summary="Finds minimized, tenant-scoped case access, attribution, and explicitly referenced lifecycle facts.",
+            contract_version="0.1.0",
+        ),
+        CAPABILITY_TICKET_CASE_ESCALATION: CapabilityDocumentation(
+            label="Ticket-to-Case escalation",
+            summary="Creates one replay-safe formal Case from a Ticket handoff and returns only the stable Case reference.",
+            contract_version="1.0.0",
+        ),
     },
     migration_spec=MigrationSpec(
         module_id=MODULE_ID,
@@ -345,8 +494,331 @@ manifest = ModuleManifest(
         ),
     ),
     resource_acl_providers=(CaseAclProvider(),),
+    search_sources=(
+        SearchSourceProviderRegistration(
+            id="cases.cases",
+            factory=create_cases_search_source,
+        ),
+    ),
     tenant_summary_providers=(_tenant_summary,),
     documentation=(
+        DocumentationTopic(
+            id="cases.workflow.ticket-escalation",
+            title="Create a formal Case from a Ticket escalation",
+            summary="Preserve the operational Ticket and start one replay-safe formal procedure with a stable cross-reference.",
+            body=(
+                "An authorized ticket triage actor selects an active Case type and submits a handoff note. "
+                "Cases rechecks the active tenant and cases:case:create permission, derives a stable Case identity from the Ticket and idempotency key, "
+                "uses the configured initial status, and records the exact Ticket work-item reference in the governed Case context. "
+                "The Ticket remains authoritative for intake, queue work, comments, and service resolution; the Case becomes authoritative for parties, evidence, decisions, deadlines, records, and retention. "
+                "Replaying the same request returns the existing Case. A changed request or missing/inactive Case type fails closed."
+            ),
+            layer="configured",
+            documentation_types=("admin", "user"),
+            audience=("case_manager", "ticket_manager", "operator", "auditor"),
+            related_modules=("tickets",),
+            order=11,
+            conditions=(
+                DocumentationCondition(
+                    required_modules=("cases", "tickets"),
+                    required_scopes=(CREATE_SCOPE, "tickets:ticket:triage"),
+                ),
+            ),
+            translations={
+                "de": {
+                    "title": "Aus einer Ticket-Eskalation einen förmlichen Vorgang anlegen",
+                    "summary": "Das operative Ticket erhalten und ein wiederholungssicheres förmliches Verfahren mit stabilem Querverweis starten.",
+                    "body": "Eine berechtigte Triage wählt einen aktiven Vorgangstyp und übergibt einen Hinweis. Cases prüft den aktiven Mandanten und die Berechtigung cases:case:create erneut, leitet aus Ticket und Idempotenzschlüssel eine stabile Vorgangskennung ab, verwendet den konfigurierten Anfangsstatus und hält den genauen Ticket-Verweis im geregelten Vorgangskontext fest. Das Ticket bleibt für Aufnahme, Warteschlangenarbeit, Kommentare und Servicelösung maßgeblich; der Vorgang wird für Beteiligte, Nachweise, Entscheidungen, Fristen, Akten und Aufbewahrung maßgeblich. Dieselbe Anfrage liefert den vorhandenen Vorgang; geänderte Anfragen sowie fehlende oder inaktive Vorgangstypen werden abgewiesen.",
+                }
+            },
+            metadata={
+                "kind": "workflow",
+                "help_contexts": [
+                    "tickets.action.escalate",
+                    "cases.state.ticket-escalation",
+                ],
+                "consequence_classes": {
+                    "create_case": "Creates one Cases-owned formal procedure and returns its stable reference.",
+                    "preserve_ticket": "Does not convert, copy, or mutate the Ticket history.",
+                },
+            },
+        ),
+        DocumentationTopic(
+            id="cases.workflow.link-owner-references",
+            title="Link exact Files, Mail, and Campaign references to a Case",
+            summary=(
+                "Append or remove an owner-authorized reference without copying "
+                "the provider's content into Cases."
+            ),
+            body=(
+                "On an active Case, Files, Mail, and Campaigns may return an exact "
+                "tenant-bound selection through the versioned Quick Access result "
+                "contract. Cases accepts only the supported owner and reference-kind "
+                "pairs, a matching tenant, a pinned version, and the owner's canonical "
+                "local route. Linking and unlinking recheck Case update authority, use "
+                "expected-revision concurrency and idempotency, and append immutable "
+                "Case history. Cases stores only a typed owner identifier, exact version, "
+                "and owner route; it never copies file bytes, message headers or bodies, "
+                "recipients, campaign content, or a source access decision. Opening a "
+                "link always enters the owning module, which rechecks current access. "
+                "If the owner module is disabled or source access is later revoked, the "
+                "Case retains the historical reference but does not disclose source "
+                "content. Unlinking removes only the reference from the next Case revision "
+                "and never deletes the owner object. Unsaved Case edits must be saved or "
+                "discarded before a Quick Access result can be linked."
+            ),
+            layer="configured",
+            documentation_types=("admin", "user"),
+            audience=("case_manager", "operator", "module_admin", "auditor"),
+            related_modules=("quick_access", "files", "mail", "campaigns"),
+            order=12,
+            conditions=(
+                DocumentationCondition(
+                    required_modules=("cases",),
+                    required_scopes=(UPDATE_SCOPE,),
+                ),
+            ),
+            links=(
+                DocumentationLink(label="Cases", href="/cases", kind="runtime"),
+                DocumentationLink(
+                    label="Quick Access architecture",
+                    href="govoplan/docs/architecture/QUICK_ACCESS_AND_PRODUCT_AREAS.md",
+                    kind="repository",
+                ),
+            ),
+            translations={
+                "de": {
+                    "title": "Exakte Files-, Mail- und Campaign-Verweise mit einem Vorgang verknüpfen",
+                    "summary": (
+                        "Einen vom zuständigen Modul autorisierten Verweis hinzufügen oder entfernen, ohne dessen Inhalt nach Cases zu kopieren."
+                    ),
+                    "body": (
+                        "Für einen aktiven Vorgang können Files, Mail und Campaigns über den versionierten Schnellzugriff-Ergebnisvertrag eine "
+                        "exakte mandantengebundene Auswahl zurückgeben. Cases akzeptiert nur unterstützte Kombinationen aus zuständigem Modul "
+                        "und Verweisart, den passenden Mandanten, eine festgelegte Version und die kanonische lokale Route des zuständigen Moduls. "
+                        "Verknüpfen und Entfernen prüfen die Änderungsberechtigung für den Vorgang erneut, verwenden erwartete Revision und "
+                        "Idempotenz und ergänzen eine unveränderliche Vorgangshistorie. Cases speichert nur typisierte Modulkennung, exakte "
+                        "Version und Modulroute; Dateibytes, Nachrichtenkopf oder -inhalt, Empfangende, Campaign-Inhalt oder eine frühere "
+                        "Zugriffsentscheidung werden nie kopiert. Das Öffnen wechselt stets in das zuständige Modul, das den aktuellen Zugriff "
+                        "erneut prüft. Wird dieses Modul deaktiviert oder der Quellzugriff später entzogen, behält der Vorgang den historischen "
+                        "Verweis, legt aber keinen Quellinhalt offen. Das Entfernen nimmt nur den Verweis aus der nächsten Vorgangsrevision und "
+                        "löscht niemals das Quellobjekt. Ungespeicherte Vorgangsänderungen müssen vor dem Verknüpfen eines Schnellzugriff-Ergebnisses "
+                        "gespeichert oder verworfen werden."
+                    ),
+                }
+            },
+            metadata={
+                "kind": "workflow",
+                "help_contexts": ["cases.detail.references"],
+                "consequence_classes": {
+                    "link_owner_reference": "Appends an immutable Case revision containing only the exact typed owner reference.",
+                    "unlink_owner_reference": "Appends an immutable Case revision and leaves the owner object unchanged.",
+                },
+            },
+        ),
+        DocumentationTopic(
+            id="cases.data-subject-requests",
+            title="Case data-subject requests",
+            summary="Report governed case facts without guessing applicant identity or exposing opaque case payloads.",
+            body=(
+                "The Cases DSAR provider matches exact-tenant account, identity, and membership attribution, account/identity access grants, and explicit Cases references. "
+                "A canonical selector combined with a direct reference must be corroborated by a Cases-owned relationship or the search fails closed. Direct case and revision references export a typed, minimized lifecycle projection; raw snapshots, metadata, search text, free-text change reasons, timeline payloads and summaries, evidence identifiers, request digests, idempotency keys, audit identifiers, and unrelated access subjects are excluded. "
+                "Immutable case identities, revisions, timelines, and attribution are retained. Current open case and active access facts require authorized manual review through the normal case/access lifecycle; no automatic erasure is published. Applicant-to-identity linkage remains owned by Parties, so Cases does not infer it from party identifiers."
+            ),
+            layer="configured",
+            documentation_types=("admin", "user"),
+            audience=("user", "operator", "module_admin", "auditor"),
+            related_modules=("parties", "records", "forms_runtime", "portal"),
+            links=(
+                DocumentationLink(
+                    label="Cases concept",
+                    href="govoplan-cases/docs/CONCEPT.md",
+                    kind="repository",
+                ),
+            ),
+            translations={
+                "de": {
+                    "title": "Betroffenenanfragen für Vorgänge",
+                    "summary": (
+                        "Gesteuerte Vorgangstatsachen ausgeben, ohne die antragstellende Identität zu erraten oder undurchsichtige "
+                        "Vorgangsdaten offenzulegen."
+                    ),
+                    "body": (
+                        "Der DSAR-Provider von Cases gleicht im exakten Mandanten Konten-, Identitäts- und Mitgliedschaftszuordnungen, "
+                        "Zugriffsfreigaben für Konten oder Identitäten und ausdrückliche Cases-Verweise ab. Wird ein kanonischer Selektor mit "
+                        "einem direkten Verweis kombiniert, muss eine Cases-eigene Beziehung beide bestätigen; andernfalls schließt die Suche "
+                        "sicher. Direkte Vorgangs- und Revisionsverweise exportieren eine typisierte, minimierte Lebenszyklusprojektion. Rohe "
+                        "Snapshots, Metadaten, Suchtext, Freitext-Änderungsgründe, Timeline-Nutzdaten und -Zusammenfassungen, Nachweiskennungen, "
+                        "Anfrage-Digests, Idempotenzschlüssel, Auditkennungen und unbeteiligte Zugriffsbetroffene sind ausgeschlossen. "
+                        "Unveränderliche Vorgangskennungen, Revisionen, Timelines und Zuordnungen werden aufbewahrt. Aktuelle offene Vorgänge und "
+                        "aktive Zugriffsmerkmale erfordern eine berechtigte manuelle Prüfung im normalen Vorgangs-/Zugriffslebenszyklus; eine "
+                        "automatische Löschung wird nicht angeboten. Die Verbindung zwischen antragstellender Person und Identität gehört Parties; "
+                        "Cases leitet sie daher nicht aus Beteiligtenkennungen ab."
+                    ),
+                }
+            },
+        ),
+        DocumentationTopic(
+            id="cases.workflow.quick-access-context",
+            title="Use task-local tools from an active Case",
+            summary="Launch an authorized full-page tool and return to the exact Case route and context.",
+            body=(
+                "After an exact Case revision loads, the Case detail page publishes a bounded active-object reference to Core. "
+                "Quick Access may carry that reference together with the current tenant, acting assignment, temporal selection, "
+                "View revision, and route when opening an owning module's full page. It never carries Case content or an access "
+                "decision. The destination reauthorizes its data and effects. Unsaved Case edits use the shared save/discard guard "
+                "before navigation, and the shell provides an explicit return action."
+            ),
+            layer="available",
+            documentation_types=("admin", "user"),
+            audience=("case_manager", "operator", "module_admin"),
+            related_modules=("quick_access", "views", "access"),
+            order=13,
+            links=(
+                DocumentationLink(label="Cases", href="/cases", kind="runtime"),
+                DocumentationLink(
+                    label="Quick Access architecture",
+                    href="govoplan/docs/architecture/QUICK_ACCESS_AND_PRODUCT_AREAS.md",
+                    kind="repository",
+                ),
+            ),
+            translations={
+                "de": {
+                    "title": "Aufgabenbezogene Werkzeuge aus einem aktiven Vorgang verwenden",
+                    "summary": "Ein berechtigtes Werkzeug oeffnen und zum genauen Vorgangskontext zurueckkehren.",
+                    "body": (
+                        "Nach dem Laden einer genauen Vorgangsrevision veroeffentlicht die Detailseite einen begrenzten Objektverweis an Core. "
+                        "Der Schnellzugriff darf diesen Verweis zusammen mit Mandant, handelnder Zuordnung, Zeitbezug, Ansichtsversion und Ruecksprungort uebergeben. "
+                        "Vorgangsinhalte oder Zugriffsentscheidungen werden nicht uebertragen. Das Ziel prueft Daten und Wirkungen erneut; ungespeicherte Aenderungen "
+                        "werden vor dem Wechsel durch den gemeinsamen Speichern-Verwerfen-Dialog geschuetzt."
+                    ),
+                }
+            },
+            metadata={"help_contexts": ["cases.detail.quick-access"]},
+        ),
+        DocumentationTopic(
+            id="cases.workflow.record-formal-decision",
+            title="Record a formal Decision from a Case",
+            summary="Revalidate acting authority and preserve an exact Decision revision in the Case history.",
+            body=(
+                "The Case detail action accepts only the operative result, reasoning, conditions, effective time, and change reason. "
+                "Cases resolves the exact Case revision, verifies object update access, resolves the current acting assignment through "
+                "Access, and requires exactly one effective Mandate for cases.formal_decision and the selected Decision type. It then "
+                "records the outcome through the optional Decisions registry and links the exact Decision revision to a new Case revision "
+                "in the same database transaction. A replay uses a deterministic Decision identifier; changed replay payloads fail closed."
+            ),
+            layer="configured",
+            documentation_types=("admin", "user"),
+            audience=("case_manager", "decision_officer", "operator", "auditor"),
+            related_modules=("access", "mandates", "decisions", "records"),
+            order=14,
+            conditions=(
+                DocumentationCondition(
+                    required_modules=("cases", "access", "mandates", "decisions"),
+                    required_scopes=("cases:case:update", "decisions:decision:write"),
+                ),
+            ),
+            links=(
+                DocumentationLink(label="Cases", href="/cases", kind="runtime"),
+                DocumentationLink(
+                    label="Cases concept",
+                    href="govoplan-cases/docs/CONCEPT.md",
+                    kind="repository",
+                ),
+                DocumentationLink(
+                    label="Decisions domain",
+                    href="govoplan-decisions/docs/DECISIONS_DOMAIN.md",
+                    kind="repository",
+                ),
+            ),
+            translations={
+                "de": {
+                    "title": "Förmliche Entscheidung aus einem Vorgang festhalten",
+                    "summary": "Handlungsbefugnis erneut prüfen und eine exakte Decision-Revision in der Vorgangshistorie bewahren.",
+                    "body": (
+                        "Die Aktion in der Vorgangsdetailansicht akzeptiert nur Tenor, Begründung, Bedingungen, Wirksamkeitszeitpunkt und "
+                        "Änderungsgrund. Cases löst die exakte Vorgangsrevision auf, prüft den objektbezogenen Änderungszugriff, ermittelt über "
+                        "Access die aktuelle Handlungszuweisung und verlangt genau ein wirksames Mandat für cases.formal_decision und den gewählten "
+                        "Decision-Typ. Anschließend wird das Ergebnis über das optionale Decisions-Register aufgezeichnet und die exakte "
+                        "Decision-Revision in derselben Datenbanktransaktion mit einer neuen Vorgangsrevision verknüpft. Eine Wiederholung "
+                        "verwendet eine deterministische Decision-Kennung; abweichende Nutzdaten schließen sicher."
+                    ),
+                }
+            },
+            metadata={
+                "kind": "workflow",
+                "help_contexts": ["cases.action.decide", "cases.decision.editor"],
+                "prerequisites": [
+                    "The Case has an exact responsible organization, function, evidence, and legal-basis version.",
+                    "An active acting assignment and exactly one effective Mandate authorize the Decision type.",
+                ],
+                "steps": [
+                    "Open the Case and select the appropriate acting assignment in the title bar.",
+                    "Record the operative result, reasoning, optional conditions, effective time, and change reason.",
+                    "Confirm the exact Decision and Case revisions in the Case timeline.",
+                    "When Records is enabled, file the exact Decision or Case revision into the destination eAkte.",
+                ],
+                "outcome": "The formal outcome is Decisions-owned and exact-version linked from the Case.",
+            },
+        ),
+        DocumentationTopic(
+            id="cases.workflow.file-exact-revision",
+            title="File an exact case revision into an eAkte",
+            summary="Preserve a reconstructable case snapshot in Records without moving case ownership.",
+            body=(
+                "When Records is enabled, Cases resolves an exact immutable case revision only after "
+                "current case permission and object-level access are checked. The filed reference includes "
+                "the case number, lifecycle state, represented valid interval, recorded time, and a SHA-256 "
+                "digest of the canonical snapshot. Cases remains authoritative for the case lifecycle."
+            ),
+            layer="configured",
+            documentation_types=("admin", "user"),
+            audience=("case_manager", "records_manager", "operator", "auditor"),
+            related_modules=("records",),
+            order=15,
+            conditions=(
+                DocumentationCondition(
+                    required_modules=("cases", "records"),
+                    required_scopes=("cases:case:read", "records:workspace:write"),
+                ),
+            ),
+            links=(
+                DocumentationLink(label="Cases", href="/cases", kind="runtime"),
+                DocumentationLink(label="Records", href="/records", kind="runtime"),
+                DocumentationLink(
+                    label="Cases concept",
+                    href="govoplan-cases/docs/CONCEPT.md",
+                    kind="repository",
+                ),
+            ),
+            translations={
+                "de": {
+                    "title": "Exakte Vorgangsrevision in eine eAkte ablegen",
+                    "summary": "Einen rekonstruierbaren Vorgangs-Snapshot in Records bewahren, ohne die Zuständigkeit von Cases zu verlagern.",
+                    "body": (
+                        "Ist Records aktiviert, löst Cases eine exakte unveränderliche Vorgangsrevision erst auf, nachdem aktuelle "
+                        "Vorgangsberechtigung und objektbezogener Zugriff geprüft wurden. Der abgelegte Verweis enthält Vorgangsnummer, "
+                        "Lebenszyklusstatus, dargestelltes Gültigkeitsintervall, Aufzeichnungszeitpunkt und einen SHA-256-Digest des kanonischen "
+                        "Snapshots. Cases bleibt für den Vorgangslebenszyklus maßgeblich."
+                    ),
+                }
+            },
+            metadata={
+                "kind": "workflow",
+                "help_contexts": ["cases.detail", "records.action.file"],
+                "prerequisites": [
+                    "You currently may read the case and file items into the destination record.",
+                    "The exact immutable case revision has been identified.",
+                ],
+                "steps": [
+                    "Open the case and identify the revision that represents the evidence state.",
+                    "Choose the destination record and state the access purpose and filing reason.",
+                    "Confirm filing; Cases rechecks current access and resolves the exact revision.",
+                    "Verify the case revision and snapshot digest in the record chronology.",
+                ],
+                "outcome": "The eAkte preserves an exact case snapshot reference while Cases retains authority.",
+            },
+        ),
         DocumentationTopic(
             id="cases.institutional-context",
             title="Case institutional context",
@@ -357,7 +829,10 @@ manifest = ModuleManifest(
                 "intake retains the exact Service, Mandate, jurisdiction, legal basis, form, "
                 "workflow, and result bindings. Procedure parties come from an optional provider "
                 "or a limited Cases-only compatibility projection. Assignment, evidence, Decision, "
-                "and record links remain stable references owned by their source modules."
+                "and record links remain stable references owned by their source modules. When "
+                "Search is enabled, Cases contributes a rebuildable metadata-only projection. "
+                "Evidence and protected Decision content are excluded, and every candidate is "
+                "rechecked against current Case access before disclosure."
             ),
             layer="available",
             documentation_types=("admin", "user"),
@@ -369,10 +844,28 @@ manifest = ModuleManifest(
                     kind="repository",
                 ),
             ),
+            translations={
+                "de": {
+                    "title": "Institutioneller Kontext eines Vorgangs",
+                    "summary": (
+                        "Cases bewahrt Service- und Beteiligtenverweise, ohne institutionelle Definitionen oder Betroffenenstammdaten zu übernehmen."
+                    ),
+                    "body": (
+                        "Vorgangstypen und -status sind Mandantenkonfiguration. Jede Anlage oder Änderung schreibt eine unveränderliche, durch "
+                        "optimistische Nebenläufigkeitskontrolle geschützte Revision und ein wiederholungssicheres Timeline-Ereignis. Die "
+                        "Service-Aufnahme hält exakte Bindungen an Service, Mandat, Zuständigkeit, Rechtsgrundlage, Formular, Workflow und Ergebnis "
+                        "fest. Verfahrensbeteiligte stammen von einem optionalen Provider oder einer begrenzten Cases-Kompatibilitätsprojektion. "
+                        "Zuweisungs-, Nachweis-, Decision- und Aktenverweise bleiben stabile Referenzen im Eigentum ihrer Quellmodule. Ist Search "
+                        "aktiviert, liefert Cases eine neu aufbaubare reine Metadatenprojektion. Nachweise und geschützte Decision-Inhalte sind "
+                        "ausgeschlossen; jeder Treffer wird vor der Offenlegung erneut gegen den aktuellen Vorgangszugriff geprüft."
+                    ),
+                }
+            },
             metadata={
                 "help_contexts": [
                     "cases.list",
                     "cases.detail",
+                    "cases.search.result",
                     "cases.state.read-only",
                     "cases.state.restricted",
                 ],
@@ -404,7 +897,26 @@ manifest = ModuleManifest(
                     kind="repository",
                 ),
             ),
+            translations={
+                "de": {
+                    "title": "Referenz für Vorgangslebenszyklus, Zugriff und Nachweise",
+                    "summary": (
+                        "Revisions-, Status-, Zugriffs- und Verweisfelder gemeinsam mit ihren dauerhaften Folgen erläutern."
+                    ),
+                    "body": (
+                        "Änderungen an Titel und Status ergänzen eine unveränderliche Vorgangsrevision, geschützt durch erwartete Revision und "
+                        "stabilen Idempotenzschlüssel. Jede akzeptierte Änderung ergänzt außerdem einen Timeline-Eintrag mit handelnder Person, "
+                        "Zeitpunkt und Änderungsgrund; ein abschließender Status verlangt zusätzlich die Berechtigung zum Schließen. Die Sichtbarkeit "
+                        "eines Vorgangs ist mandantenweit oder eingeschränkt. Eingeschränkte Vorgänge bleiben nur durch administrative Befugnis, "
+                        "Zuweisungs- oder Einheitenkontext, Erstellerbefugnis oder eine ausdrückliche Konto-/Gruppenfreigabe sichtbar. "
+                        "Zugriffsänderungen ergänzen eine weitere unveränderliche Revision und verlangen Bestätigung. Service-, Beteiligten-, "
+                        "Zuweisungs-, Decision- und Aktenverweise bezeichnen Objekte anderer Provider; Cases bewahrt ihre stabilen Kennungen und "
+                        "Versionen, ohne sie zu kopieren oder stillschweigend zu verändern."
+                    ),
+                }
+            },
             metadata={
+                "kind": "reference",
                 "help_contexts": [
                     "cases.field.title",
                     "cases.field.status",
@@ -459,5 +971,10 @@ manifest = ModuleManifest(
 )
 
 
+manifest = with_documentation_structured_translations(
+    manifest, locale="de", translations=GERMAN_STRUCTURED_TRANSLATIONS
+)
+
+
 def get_manifest() -> ModuleManifest:
     return manifest

src/govoplan_cases/backend/record_source.py

@@ -0,0 +1,115 @@
+from __future__ import annotations
+
+from collections.abc import Sequence
+import hashlib
+import json
+from urllib.parse import quote
+
+from sqlalchemy.orm import Session
+
+from govoplan_core.core.records import (
+    RecordContractError,
+    RecordSourceLocator,
+    RecordSourceReference,
+)
+from govoplan_cases.backend.db.models import CaseIdentity, CaseRecordRevision
+from govoplan_cases.backend.service import can_access_case
+
+
+CAPABILITY_RECORD_SOURCE_CASES = "records.source.cases"
+
+
+class CasesRecordSource:
+    provider_id = "cases"
+
+    def resource_types(self) -> Sequence[str]:
+        return ("case_revision",)
+
+    def resolve(
+        self,
+        session: object,
+        principal: object,
+        *,
+        locator: RecordSourceLocator,
+        purpose: str,
+    ) -> RecordSourceReference:
+        if not isinstance(session, Session):
+            raise RecordContractError(
+                "Case record references require a database session."
+            )
+        tenant_id = str(getattr(principal, "tenant_id", "") or "").strip()
+        if not tenant_id or locator.tenant_id != tenant_id:
+            raise RecordContractError("Case record references cannot cross tenants.")
+        if locator.source_module != "cases" or locator.resource_type != "case_revision":
+            raise RecordContractError("Unsupported Cases record source type.")
+        if not str(purpose or "").strip():
+            raise RecordContractError("Case record references require a purpose.")
+        if not hasattr(principal, "has") or not (
+            principal.has("cases:case:read") or principal.has("cases:case:admin")
+        ):
+            raise RecordContractError("Current Cases read permission is required.")
+        if not can_access_case(
+            session, principal, case_id=locator.resource_id, permission="read"
+        ):
+            raise RecordContractError("The current principal cannot read this case.")
+        try:
+            revision = int(locator.source_revision)
+        except ValueError as exc:
+            raise RecordContractError("Case source revisions must be numeric.") from exc
+        row = (
+            session.query(CaseRecordRevision)
+            .filter(
+                CaseRecordRevision.tenant_id == tenant_id,
+                CaseRecordRevision.case_id == locator.resource_id,
+                CaseRecordRevision.revision == revision,
+            )
+            .one_or_none()
+        )
+        if row is None:
+            raise RecordContractError("The exact case revision does not exist.")
+        identity = (
+            session.query(CaseIdentity)
+            .filter(
+                CaseIdentity.tenant_id == tenant_id,
+                CaseIdentity.case_id == locator.resource_id,
+            )
+            .one_or_none()
+        )
+        if identity is None:
+            raise RecordContractError("The case identity is unavailable.")
+        snapshot_json = json.dumps(
+            row.snapshot,
+            sort_keys=True,
+            separators=(",", ":"),
+            default=str,
+        ).encode("utf-8")
+        return RecordSourceReference(
+            locator=locator,
+            label=f"{identity.case_number} - {row.title}",
+            authority_mode="external_authoritative",
+            content_sha256=hashlib.sha256(snapshot_json).hexdigest(),
+            content_type="application/vnd.govoplan.case-revision+json",
+            size_bytes=len(snapshot_json),
+            valid_from=row.opened_at,
+            valid_to=row.closed_at,
+            recorded_at=row.recorded_at,
+            launch_url=f"/cases/{quote(row.case_id, safe='')}",
+            metadata={
+                "case_number": identity.case_number,
+                "case_type_key": row.case_type_key,
+                "status_key": row.status_key,
+                "access_mode": row.access_mode,
+                "snapshot_sha256": hashlib.sha256(snapshot_json).hexdigest(),
+            },
+        )
+
+
+def create_cases_record_source(_context: object) -> CasesRecordSource:
+    return CasesRecordSource()
+
+
+__all__ = [
+    "CAPABILITY_RECORD_SOURCE_CASES",
+    "CasesRecordSource",
+    "create_cases_record_source",
+]

src/govoplan_cases/backend/router.py

@@ -32,6 +32,9 @@ from govoplan_cases.backend.manifest import (
     UPDATE_SCOPE,
 )
 from govoplan_cases.backend.schemas import (
+    CaseDecisionRequest,
+    CaseEvidenceLinkRequest,
+    CaseEvidenceUnlinkRequest,
     CaseHistoryResponse,
     CaseListResponse,
     CaseStatusWriteRequest,
@@ -40,6 +43,19 @@ from govoplan_cases.backend.schemas import (
     CaseUpdateRequest,
     CaseWriteRequest,
 )
+from govoplan_cases.backend.evidence_links import (
+    link_case_evidence,
+    unlink_case_evidence,
+)
+from govoplan_cases.backend.decision_path import (
+    CaseDecisionCommand,
+    CaseDecisionError,
+    CaseDecisionPath,
+    CaseDecisionUnavailable,
+    DECISION_READ_SCOPE,
+    DECISION_SENSITIVE_READ_SCOPE,
+    DECISION_WRITE_SCOPE,
+)
 from govoplan_cases.backend.service import (
     CaseStoreError,
     can_access_case,
@@ -66,7 +82,9 @@ def _require(principal: ApiPrincipal, scope: str) -> None:
 def _error(exc: Exception) -> HTTPException:
     message = str(exc)
     lowered = message.casefold()
-    if isinstance(exc, LookupError):
+    if isinstance(exc, CaseDecisionUnavailable):
+        code = status.HTTP_424_FAILED_DEPENDENCY
+    elif isinstance(exc, LookupError):
         code = 404
     elif isinstance(exc, PermissionError):
         code = 403
@@ -206,6 +224,78 @@ def api_create_case(
     return item.to_dict()
 
 
+@router.get("/{case_id}/decisions", response_model=dict[str, list[dict[str, Any]]])
+def api_case_decisions(
+    case_id: str,
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> dict[str, list[dict[str, Any]]]:
+    _require(principal, READ_SCOPE)
+    _require(principal, DECISION_READ_SCOPE)
+    try:
+        items = CaseDecisionPath(get_registry()).linked(
+            session,
+            principal,
+            case_id=case_id,
+        )
+    except (
+        CaseDecisionError,
+        InstitutionalContextError,
+        LookupError,
+        PermissionError,
+    ) as exc:
+        raise _error(exc) from exc
+    disclose = has_scope(principal, DECISION_SENSITIVE_READ_SCOPE)
+    return {
+        "decisions": [
+            item.to_dict(include_protected=disclose)
+            for item in items
+        ]
+    }
+
+
+@router.post(
+    "/{case_id}/decisions",
+    response_model=dict[str, Any],
+    status_code=status.HTTP_201_CREATED,
+)
+def api_record_case_decision(
+    case_id: str,
+    payload: CaseDecisionRequest,
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> dict[str, Any]:
+    _require(principal, UPDATE_SCOPE)
+    _require(principal, DECISION_WRITE_SCOPE)
+    try:
+        result = CaseDecisionPath(get_registry()).record(
+            session,
+            principal,
+            case_id=case_id,
+            command=CaseDecisionCommand(
+                expected_case_revision=payload.expected_case_revision,
+                effective_at=payload.effective_at,
+                decision_type=payload.decision_type,
+                operative_result=payload.operative_result,
+                reasoning=payload.reasoning,
+                conditions=tuple(payload.conditions),
+                change_reason=payload.change_reason,
+                idempotency_key=payload.idempotency_key,
+            ),
+        )
+        session.commit()
+    except (
+        CaseDecisionError,
+        InstitutionalContextError,
+        LookupError,
+        PermissionError,
+        ValueError,
+    ) as exc:
+        session.rollback()
+        raise _error(exc) from exc
+    return result.to_dict()
+
+
 @router.get("/{case_id}", response_model=dict[str, Any])
 def api_get_case(
     case_id: str,
@@ -265,6 +355,72 @@ def api_update_case(
     return item.to_dict()
 
 
+@router.post("/{case_id}/evidence-links", response_model=dict[str, Any])
+def api_link_case_evidence(
+    case_id: str,
+    payload: CaseEvidenceLinkRequest,
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> dict[str, Any]:
+    _require(principal, UPDATE_SCOPE)
+    try:
+        item = link_case_evidence(
+            session,
+            principal,
+            case_id=case_id,
+            expected_revision=payload.expected_revision,
+            reference=payload.reference.model_dump(),
+            recorded_at=payload.recorded_at,
+            change_reason=payload.change_reason,
+            idempotency_key=payload.idempotency_key,
+        )
+        session.commit()
+    except (
+        CaseStoreError,
+        InstitutionalContextError,
+        LookupError,
+        PermissionError,
+    ) as exc:
+        session.rollback()
+        raise _error(exc) from exc
+    return item.to_dict()
+
+
+@router.post(
+    "/{case_id}/evidence-links/{evidence_id}/unlink",
+    response_model=dict[str, Any],
+)
+def api_unlink_case_evidence(
+    case_id: str,
+    evidence_id: str,
+    payload: CaseEvidenceUnlinkRequest,
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> dict[str, Any]:
+    _require(principal, UPDATE_SCOPE)
+    try:
+        item = unlink_case_evidence(
+            session,
+            principal,
+            case_id=case_id,
+            evidence_id=evidence_id,
+            expected_revision=payload.expected_revision,
+            recorded_at=payload.recorded_at,
+            change_reason=payload.change_reason,
+            idempotency_key=payload.idempotency_key,
+        )
+        session.commit()
+    except (
+        CaseStoreError,
+        InstitutionalContextError,
+        LookupError,
+        PermissionError,
+    ) as exc:
+        session.rollback()
+        raise _error(exc) from exc
+    return item.to_dict()
+
+
 @router.get(
     "/{case_id}/share-target-options",
     response_model=ReferenceOptionListResponse,

src/govoplan_cases/backend/schemas.py

@@ -82,6 +82,49 @@ class CaseUpdateRequest(BaseModel):
     metadata: dict[str, Any] | None = None
 
 
+class CaseOwnerReferenceRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    owner_module: str = Field(min_length=1, max_length=120)
+    kind: str = Field(min_length=1, max_length=120)
+    object_id: str = Field(min_length=1, max_length=1_000)
+    tenant_id: str = Field(min_length=1, max_length=255)
+    version: str = Field(min_length=1, max_length=255)
+    path: str = Field(min_length=1, max_length=2_000)
+
+
+class CaseEvidenceLinkRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    expected_revision: int = Field(ge=1)
+    recorded_at: datetime
+    change_reason: str = Field(min_length=1, max_length=1_000)
+    idempotency_key: str = Field(min_length=1, max_length=255)
+    reference: CaseOwnerReferenceRequest
+
+
+class CaseEvidenceUnlinkRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    expected_revision: int = Field(ge=1)
+    recorded_at: datetime
+    change_reason: str = Field(min_length=1, max_length=1_000)
+    idempotency_key: str = Field(min_length=1, max_length=255)
+
+
+class CaseDecisionRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    expected_case_revision: int = Field(ge=1)
+    effective_at: datetime
+    decision_type: str = Field(min_length=1, max_length=120)
+    operative_result: str = Field(min_length=1, max_length=20_000)
+    reasoning: str = Field(min_length=1, max_length=50_000)
+    conditions: list[str] = Field(default_factory=list, max_length=100)
+    change_reason: str = Field(min_length=1, max_length=1_000)
+    idempotency_key: str = Field(min_length=1, max_length=255)
+
+
 class CaseListResponse(BaseModel):
     cases: list[dict[str, Any]]
     total: int
@@ -99,6 +142,9 @@ class CaseTimelineResponse(BaseModel):
 
 __all__ = [
     "CaseGrantRequest",
+    "CaseDecisionRequest",
+    "CaseEvidenceLinkRequest",
+    "CaseEvidenceUnlinkRequest",
     "CaseHistoryResponse",
     "CaseListResponse",
     "CaseStatusWriteRequest",

src/govoplan_cases/backend/search_source.py

@@ -0,0 +1,283 @@
+from __future__ import annotations
+
+from collections.abc import Mapping, Sequence
+from urllib.parse import quote
+
+from sqlalchemy import func, select
+from sqlalchemy.orm import Session
+
+from govoplan_core.auth import ApiPrincipal
+from govoplan_core.core.events import PlatformEvent
+from govoplan_core.core.modules import ModuleContext
+from govoplan_core.core.search import (
+    SearchAuthorizationRequest,
+    SearchBackfillPage,
+    SearchBackfillRequest,
+    SearchDocument,
+    SearchIndexChange,
+    SearchResourceReference,
+    SearchResourceType,
+)
+from govoplan_cases.backend.db.models import (
+    CaseAccessGrant,
+    CaseIdentity,
+    CaseRecordRevision,
+)
+from govoplan_cases.backend.service import can_access_case
+
+
+PROVIDER_ID = "cases.cases"
+RESOURCE_TYPE = "case"
+READ_SCOPE = "cases:case:read"
+ADMIN_SCOPE = "cases:case:admin"
+
+
+class CasesSearchSource:
+    def resource_types(self) -> Sequence[SearchResourceType]:
+        return (
+            SearchResourceType(
+                provider_id=PROVIDER_ID,
+                module_id="cases",
+                resource_type=RESOURCE_TYPE,
+                label="Cases",
+                requires_authorization_recheck=True,
+            ),
+        )
+
+    def backfill(
+        self,
+        session: object,
+        *,
+        request: SearchBackfillRequest,
+    ) -> SearchBackfillPage:
+        _assert_source(request.provider_id, request.resource_type)
+        db = _session(session)
+        statement = (
+            select(CaseRecordRevision, CaseIdentity)
+            .join(CaseIdentity, CaseIdentity.id == CaseRecordRevision.identity_id)
+            .where(
+                CaseRecordRevision.tenant_id == request.tenant_id,
+                CaseRecordRevision.superseded_at.is_(None),
+            )
+        )
+        if request.cursor:
+            statement = statement.where(CaseRecordRevision.case_id > request.cursor)
+        rows = list(
+            db.execute(
+                statement.order_by(CaseRecordRevision.case_id).limit(request.limit + 1)
+            ).all()
+        )
+        has_more = len(rows) > request.limit
+        selected = rows[: request.limit]
+        grants = _grants_by_case(
+            db,
+            request.tenant_id,
+            [row.case_id for row, _identity in selected],
+        )
+        high_watermark = db.scalar(
+            select(func.max(CaseRecordRevision.recorded_at)).where(
+                CaseRecordRevision.tenant_id == request.tenant_id,
+                CaseRecordRevision.superseded_at.is_(None),
+            )
+        )
+        return SearchBackfillPage(
+            documents=tuple(
+                _document(
+                    row,
+                    identity=identity,
+                    grants=grants.get(row.case_id, ()),
+                )
+                for row, identity in selected
+            ),
+            next_cursor=selected[-1][0].case_id if has_more and selected else None,
+            complete=not has_more,
+            high_watermark=high_watermark.isoformat() if high_watermark else None,
+        )
+
+    def authorize(
+        self,
+        session: object,
+        principal: object,
+        *,
+        requests: Sequence[SearchAuthorizationRequest],
+    ) -> Mapping[str, bool]:
+        decisions = {item.reference.key: False for item in requests}
+        if not isinstance(principal, ApiPrincipal) or not principal.has(READ_SCOPE):
+            return decisions
+        db = _session(session)
+        for request in requests:
+            reference = request.reference
+            if (
+                reference.tenant_id != principal.tenant_id
+                or reference.module_id != "cases"
+                or reference.resource_type != RESOURCE_TYPE
+            ):
+                continue
+            decisions[reference.key] = can_access_case(
+                db,
+                principal,
+                case_id=reference.resource_id,
+                permission="read",
+            )
+        return decisions
+
+    def index_changes_for_event(
+        self,
+        session: object,
+        *,
+        event: PlatformEvent,
+        delivery_key: str,
+    ) -> Sequence[SearchIndexChange]:
+        if (
+            event.module_id != "cases"
+            or event.tenant is None
+            or event.resource is None
+            or event.resource.type != RESOURCE_TYPE
+            or event.resource.id is None
+        ):
+            return ()
+        db = _session(session)
+        row = db.scalar(
+            select(CaseRecordRevision).where(
+                CaseRecordRevision.tenant_id == event.tenant.id,
+                CaseRecordRevision.case_id == event.resource.id,
+                CaseRecordRevision.superseded_at.is_(None),
+            )
+        )
+        identity = db.scalar(
+            select(CaseIdentity).where(
+                CaseIdentity.tenant_id == event.tenant.id,
+                CaseIdentity.case_id == event.resource.id,
+            )
+        )
+        deleted = row is None or identity is None
+        cursor = event.event_id
+        document = None
+        if not deleted:
+            document = _document(
+                row,
+                identity=identity,
+                grants=_grants_by_case(
+                    db,
+                    event.tenant.id,
+                    [row.case_id],
+                ).get(row.case_id, ()),
+                change_cursor=cursor,
+            )
+        reference = SearchResourceReference(
+            tenant_id=event.tenant.id,
+            module_id="cases",
+            resource_type=RESOURCE_TYPE,
+            resource_id=event.resource.id,
+        )
+        return (
+            SearchIndexChange(
+                change_id=f"{delivery_key}:{PROVIDER_ID}",
+                provider_id=PROVIDER_ID,
+                kind="delete" if deleted else "upsert",
+                reference=reference,
+                source_revision=(document.source_revision if document else cursor),
+                cursor=cursor,
+                document=document,
+                occurred_at=event.occurred_at,
+            ),
+        )
+
+
+def create_cases_search_source(_context: ModuleContext) -> CasesSearchSource:
+    return CasesSearchSource()
+
+
+def _document(
+    row: CaseRecordRevision,
+    *,
+    identity: CaseIdentity,
+    grants: Sequence[CaseAccessGrant],
+    change_cursor: str | None = None,
+) -> SearchDocument:
+    tokens = [f"scope:{READ_SCOPE}", f"scope:{ADMIN_SCOPE}"]
+    if identity.created_by:
+        tokens.extend(
+            (f"account:{identity.created_by}", f"membership:{identity.created_by}")
+        )
+    prefixes = {
+        "account": "account",
+        "identity": "identity",
+        "group": "group",
+        "role": "role",
+        "function": "function",
+        "function_assignment": "function",
+    }
+    for grant in grants:
+        prefix = prefixes.get(grant.subject_kind)
+        if prefix:
+            tokens.append(f"{prefix}:{grant.subject_id}")
+    return SearchDocument(
+        tenant_id=row.tenant_id,
+        module_id="cases",
+        provider_id=PROVIDER_ID,
+        resource_type=RESOURCE_TYPE,
+        resource_id=row.case_id,
+        title=row.title,
+        url=f"/cases/{quote(row.case_id, safe='')}",
+        summary=f"{identity.case_number} - {row.status_key}",
+        body=row.search_text[:200_000],
+        keywords=(
+            identity.case_number[:200],
+            row.case_type_key[:200],
+            row.status_key[:200],
+        ),
+        visibility="restricted",
+        acl_tokens=tuple(dict.fromkeys(tokens)),
+        metadata={
+            "case_number": identity.case_number,
+            "case_type_key": row.case_type_key,
+            "status_key": row.status_key,
+            "access_mode": row.access_mode,
+        },
+        source_revision=str(row.revision),
+        change_cursor=change_cursor,
+        source_updated_at=row.recorded_at,
+        requires_authorization_recheck=True,
+    )
+
+
+def _grants_by_case(
+    session: Session,
+    tenant_id: str,
+    case_ids: Sequence[str],
+) -> dict[str, tuple[CaseAccessGrant, ...]]:
+    grouped: dict[str, list[CaseAccessGrant]] = {
+        case_id: [] for case_id in case_ids
+    }
+    if not case_ids:
+        return {}
+    rows = session.scalars(
+        select(CaseAccessGrant).where(
+            CaseAccessGrant.tenant_id == tenant_id,
+            CaseAccessGrant.case_id.in_(tuple(case_ids)),
+            CaseAccessGrant.active.is_(True),
+        )
+    )
+    for row in rows:
+        grouped.setdefault(row.case_id, []).append(row)
+    return {key: tuple(value) for key, value in grouped.items()}
+
+
+def _assert_source(provider_id: str, resource_type: str) -> None:
+    if provider_id != PROVIDER_ID or resource_type != RESOURCE_TYPE:
+        raise ValueError("Unsupported Cases search source.")
+
+
+def _session(value: object) -> Session:
+    if not isinstance(value, Session):
+        raise TypeError("Cases search requires a SQLAlchemy session.")
+    return value
+
+
+__all__ = [
+    "CasesSearchSource",
+    "PROVIDER_ID",
+    "RESOURCE_TYPE",
+    "create_cases_search_source",
+]

src/govoplan_cases/backend/service.py

@@ -331,6 +331,8 @@ def create_case_from_intake(
             "result_refs": list(plan.result_refs),
             "required_evidence_types": list(plan.required_evidence_types),
             "deadline_refs": list(plan.deadline_refs),
+            "remedy_refs": list(plan.remedy_refs),
+            "service_level_refs": list(plan.service_level_refs),
         },
     )
     return create_case(

src/govoplan_cases/backend/service_intake.py

@@ -26,6 +26,8 @@ class CaseIntakePlan:
     result_refs: tuple[str, ...] = ()
     required_evidence_types: tuple[str, ...] = ()
     deadline_refs: tuple[str, ...] = ()
+    remedy_refs: tuple[str, ...] = ()
+    service_level_refs: tuple[str, ...] = ()
 
 
 class CaseServiceIntake:
@@ -91,6 +93,8 @@ class CaseServiceIntake:
             result_refs=_binding_refs(definition, "result"),
             required_evidence_types=definition.required_evidence_types,
             deadline_refs=definition.deadline_refs,
+            remedy_refs=definition.remedy_refs,
+            service_level_refs=definition.service_level_refs,
         )
 
 

src/govoplan_cases/backend/ticket_escalation.py

@@ -0,0 +1,161 @@
+from __future__ import annotations
+
+from urllib.parse import quote
+import uuid
+
+from sqlalchemy.orm import Session
+
+from govoplan_core.core.institutional import (
+    GovernedContextEnvelope,
+    InstitutionalReference,
+    TemporalRevision,
+)
+from govoplan_core.core.tickets import (
+    TicketCaseEscalationCommand,
+    TicketCaseEscalationResult,
+)
+from govoplan_core.security.module_permissions import scopes_grant_compatible
+from govoplan_cases.backend.domain import CaseRecord
+from govoplan_cases.backend.service import create_case, get_case, list_case_catalog
+
+
+_CASE_NAMESPACE = uuid.uuid5(
+    uuid.NAMESPACE_URL,
+    "https://govoplan.add-ideas.de/contracts/tickets/case-escalation/v1",
+)
+
+
+class TicketCaseEscalationProvider:
+    """Create one replay-safe formal Case while keeping Ticket history separate."""
+
+    def escalate_ticket(
+        self,
+        session: object,
+        principal: object,
+        *,
+        command: TicketCaseEscalationCommand,
+    ) -> TicketCaseEscalationResult:
+        db = _session(session)
+        tenant_id = str(getattr(principal, "tenant_id", "") or "").strip()
+        if command.tenant_id != tenant_id:
+            raise PermissionError("Ticket escalation cannot cross tenants.")
+        if not _has_scope(principal, "cases:case:create"):
+            raise PermissionError("Ticket escalation requires cases:case:create.")
+        case_id = str(
+            uuid.uuid5(
+                _CASE_NAMESPACE,
+                "\0".join((tenant_id, command.ticket_id, command.idempotency_key)),
+            )
+        )
+        existing = get_case(db, principal, case_id=case_id)
+        if existing is not None:
+            return _result(existing, replayed=True)
+
+        catalog = list_case_catalog(db, principal)
+        case_type = next(
+            (
+                item
+                for item in catalog["types"]
+                if item.get("type_key") == command.case_type_key and item.get("active")
+            ),
+            None,
+        )
+        if case_type is None:
+            raise ValueError(
+                f"Case type {command.case_type_key!r} is not configured or active."
+            )
+        case_ref = InstitutionalReference(
+            kind="case",
+            owner_module="cases",
+            object_id=case_id,
+            tenant_id=tenant_id,
+            version="1",
+            valid_at=command.occurred_at,
+        )
+        ticket_ref = InstitutionalReference(
+            kind="work_item",
+            owner_module="tickets",
+            object_id=command.ticket_id,
+            tenant_id=tenant_id,
+            version=str(command.metadata.get("ticket_revision") or "1"),
+            valid_at=command.occurred_at,
+            label=command.ticket_number,
+        )
+        change_reason = f"Escalated from ticket {command.ticket_number}."
+        context = GovernedContextEnvelope(
+            tenant_id=tenant_id,
+            temporal=TemporalRevision(
+                revision="1",
+                valid_from=command.occurred_at,
+                recorded_at=command.occurred_at,
+                change_reason=change_reason,
+            ),
+            case_ref=case_ref,
+            work_item_ref=ticket_ref,
+        )
+        record = CaseRecord(
+            reference=case_ref,
+            case_number=_case_number(command, case_id),
+            case_type_key=command.case_type_key,
+            status_key=str(case_type["initial_status_key"]),
+            title=command.title,
+            context=context,
+            opened_at=command.occurred_at,
+            recorded_at=command.occurred_at,
+            change_reason=change_reason,
+            metadata={
+                "source_module": "tickets",
+                "source_resource_type": "ticket",
+                "source_resource_id": command.ticket_id,
+                "source_resource_number": command.ticket_number,
+                "source_revision": str(command.metadata.get("ticket_revision") or "1"),
+                "handoff_note": command.handoff_note,
+                "integration_contract": "tickets.case_escalation/v1",
+            },
+        )
+        created = create_case(
+            db,
+            principal,
+            record=record,
+            idempotency_key=f"ticket-escalation:{command.idempotency_key}",
+        )
+        return _result(created, replayed=False)
+
+
+def _result(record: CaseRecord, *, replayed: bool) -> TicketCaseEscalationResult:
+    return TicketCaseEscalationResult(
+        provider_id="cases",
+        case_id=record.reference.object_id,
+        case_number=record.case_number,
+        case_url=f"/cases/{quote(record.reference.object_id, safe='')}",
+        replayed=replayed,
+        metadata={
+            "case_revision": record.revision,
+            "case_type_key": record.case_type_key,
+            "status_key": record.status_key,
+        },
+    )
+
+
+def _case_number(command: TicketCaseEscalationCommand, case_id: str) -> str:
+    prefix = f"CASE-{command.ticket_number}"[:230].rstrip("-")
+    return f"{prefix}-{case_id[:8].upper()}"
+
+
+def _has_scope(principal: object, scope: str) -> bool:
+    method = getattr(principal, "has", None)
+    if callable(method):
+        return bool(method(scope))
+    return scopes_grant_compatible(
+        frozenset(getattr(principal, "scopes", ()) or ()),
+        scope,
+    )
+
+
+def _session(value: object) -> Session:
+    if not isinstance(value, Session):
+        raise TypeError("Ticket Case escalation requires a SQLAlchemy session.")
+    return value
+
+
+__all__ = ["TicketCaseEscalationProvider"]

tests/test_decision_path.py

@@ -0,0 +1,350 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import UTC, datetime, timedelta
+import unittest
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session
+
+from govoplan_core.core.access import (
+    CAPABILITY_ACCESS_SEMANTIC_DIRECTORY,
+    FunctionAssignmentRef,
+)
+from govoplan_core.core.institutional import (
+    CAPABILITY_DECISION_REGISTRY,
+    CAPABILITY_MANDATE_RESOLVER,
+    EvidenceReference,
+    FormalDecision,
+    GovernedContextEnvelope,
+    InstitutionalReference,
+    LegalBasisReference,
+    MandateDefinition,
+    MandateResolution,
+    TemporalRevision,
+)
+from govoplan_cases.backend.db.models import (
+    CaseAccessGrant,
+    CaseIdentity,
+    CaseRecordRevision,
+    CaseStatusDefinition,
+    CaseTimelineEntry,
+    CaseTypeDefinition,
+)
+from govoplan_cases.backend.decision_path import (
+    CaseDecisionCommand,
+    CaseDecisionError,
+    CaseDecisionPath,
+)
+from govoplan_cases.backend.domain import CaseRecord
+from govoplan_cases.backend.service import (
+    create_case,
+    get_case,
+    upsert_case_status,
+    upsert_case_type,
+)
+
+
+NOW = datetime(2026, 8, 6, 9, 0, tzinfo=UTC)
+
+
+@dataclass
+class Principal:
+    tenant_id: str = "tenant-1"
+    account_id: str = "account-1"
+    identity_id: str = "identity-1"
+    acting_assignment_id: str | None = "assignment-1"
+    function_assignment_ids: tuple[str, ...] = ("assignment-1",)
+    scopes: frozenset[str] = frozenset(
+        {"cases:case:read", "cases:case:update", "decisions:decision:write"}
+    )
+
+
+class Registry:
+    def __init__(self, providers: dict[str, object]) -> None:
+        self.providers = providers
+
+    def has_capability(self, name: str) -> bool:
+        return name in self.providers
+
+    def capability(self, name: str) -> object:
+        return self.providers[name]
+
+
+class AccessDirectory:
+    def get_function_assignment(self, assignment_id: str):
+        if assignment_id != "assignment-1":
+            return None
+        return FunctionAssignmentRef(
+            id=assignment_id,
+            tenant_id="tenant-1",
+            account_id="account-1",
+            identity_id="identity-1",
+            function_id="permit-officer",
+            organization_unit_id="permits",
+            valid_from=NOW - timedelta(days=30),
+            valid_until=NOW + timedelta(days=30),
+        )
+
+
+class Mandates:
+    def __init__(self, mandate: MandateDefinition) -> None:
+        self.mandate = mandate
+
+    def resolve_mandate(self, session, principal, *, request):
+        del session, principal
+        return MandateResolution(competent=True, mandates=(self.mandate,))
+
+
+class Decisions:
+    def __init__(self) -> None:
+        self.items: dict[tuple[str, str], FormalDecision] = {}
+
+    def get_decision(self, session, principal, *, reference):
+        del session, principal
+        return self.items.get((reference.object_id, reference.version or ""))
+
+    def record_decision(self, session, principal, *, decision, expected_revision=None):
+        del session, principal, expected_revision
+        key = (decision.reference.object_id, decision.reference.version or "")
+        existing = self.items.get(key)
+        if existing is not None and existing != decision:
+            raise ValueError("A different Decision payload already uses this revision.")
+        self.items[key] = decision
+        return decision
+
+
+def ref(kind: str, object_id: str, owner: str, *, version: str = "1") -> InstitutionalReference:
+    return InstitutionalReference(
+        kind=kind,  # type: ignore[arg-type]
+        owner_module=owner,
+        object_id=object_id,
+        tenant_id="tenant-1",
+        version=version,
+        valid_at=NOW,
+    )
+
+
+def legal_basis() -> LegalBasisReference:
+    return LegalBasisReference(
+        kind="law",
+        authority="Example legislature",
+        reference="permit-law:3",
+        version="2026-01",
+    )
+
+
+def evidence() -> EvidenceReference:
+    return EvidenceReference(
+        kind="document",
+        owner_module="files",
+        evidence_id="application-1",
+        tenant_id="tenant-1",
+        version="3",
+        captured_at=NOW,
+    )
+
+
+def case_record() -> CaseRecord:
+    case_ref = ref("case", "case-1", "cases")
+    context = GovernedContextEnvelope(
+        tenant_id="tenant-1",
+        temporal=TemporalRevision(
+            revision="1",
+            valid_from=NOW,
+            recorded_at=NOW,
+            change_reason="Case intake.",
+        ),
+        organization_unit_ref=ref("organization_unit", "permits", "organizations"),
+        function_ref=ref("function", "permit-officer", "organizations"),
+        mandate_ref=ref("mandate", "permit-mandate", "mandates", version="4"),
+        jurisdiction_refs=(ref("jurisdiction", "city-1", "organizations"),),
+        service_ref=ref("service", "permit", "services", version="4"),
+        case_ref=case_ref,
+        legal_bases=(legal_basis(),),
+    )
+    return CaseRecord(
+        reference=case_ref,
+        case_number="PERMIT-2026-0001",
+        case_type_key="permit-application",
+        status_key="review",
+        title="Permit application",
+        context=context,
+        service_ref=context.service_ref,
+        party_refs=(ref("party", "applicant", "parties"),),
+        assignment_refs=(ref("function_assignment", "assignment-1", "access"),),
+        evidence_refs=(evidence(),),
+        opened_at=NOW,
+        recorded_at=NOW,
+        change_reason="Application received.",
+    )
+
+
+def mandate() -> MandateDefinition:
+    return MandateDefinition(
+        reference=ref("mandate", "permit-mandate", "mandates", version="4"),
+        temporal=TemporalRevision(
+            revision="4",
+            valid_from=NOW - timedelta(days=30),
+            valid_to=NOW + timedelta(days=30),
+            recorded_at=NOW - timedelta(days=31),
+            change_reason="Permit authority delegated.",
+        ),
+        task_types=("cases.formal_decision",),
+        authority_types=("permit",),
+        organization_unit_refs=(ref("organization_unit", "permits", "organizations"),),
+        function_refs=(ref("function", "permit-officer", "organizations"),),
+        jurisdiction_refs=(ref("jurisdiction", "city-1", "organizations"),),
+        legal_bases=(legal_basis(),),
+        evidence=(evidence(),),
+    )
+
+
+def command(
+    *,
+    key: str = "decision-1",
+    result: str = "Permit granted.",
+    expected_case_revision: int = 1,
+) -> CaseDecisionCommand:
+    return CaseDecisionCommand(
+        expected_case_revision=expected_case_revision,
+        effective_at=NOW + timedelta(minutes=5),
+        decision_type="permit",
+        operative_result=result,
+        reasoning="The submitted evidence satisfies the effective rule.",
+        conditions=("Display the permit visibly.",),
+        change_reason="Formal permit Decision recorded.",
+        idempotency_key=key,
+    )
+
+
+class CaseDecisionPathTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self.engine = create_engine("sqlite+pysqlite:///:memory:")
+        for table in (
+            CaseStatusDefinition.__table__,
+            CaseTypeDefinition.__table__,
+            CaseIdentity.__table__,
+            CaseRecordRevision.__table__,
+            CaseAccessGrant.__table__,
+            CaseTimelineEntry.__table__,
+        ):
+            table.create(self.engine)
+        self.session = Session(self.engine)
+        self.principal = Principal()
+        upsert_case_status(
+            self.session,
+            self.principal,
+            status_key="review",
+            label="Review",
+        )
+        upsert_case_type(
+            self.session,
+            self.principal,
+            type_key="permit-application",
+            label="Permit application",
+            initial_status_key="review",
+            allowed_status_keys=("review",),
+        )
+        create_case(
+            self.session,
+            self.principal,
+            record=case_record(),
+            idempotency_key="case-1",
+        )
+        self.session.commit()
+        self.decisions = Decisions()
+        self.path = CaseDecisionPath(
+            Registry(
+                {
+                    CAPABILITY_ACCESS_SEMANTIC_DIRECTORY: AccessDirectory(),
+                    CAPABILITY_MANDATE_RESOLVER: Mandates(mandate()),
+                    CAPABILITY_DECISION_REGISTRY: self.decisions,
+                }
+            )
+        )
+
+    def tearDown(self) -> None:
+        self.session.close()
+        self.engine.dispose()
+
+    def test_records_and_links_exact_decision_in_one_case_revision(self) -> None:
+        result = self.path.record(
+            self.session,
+            self.principal,
+            case_id="case-1",
+            command=command(),
+        )
+        self.session.commit()
+
+        self.assertEqual(2, result.case.revision)
+        self.assertEqual("Permit granted.", result.decision.operative_result)
+        self.assertEqual("assignment-1", result.decision.authority_context.actor.function_assignment_ref.object_id)
+        self.assertEqual("permit-mandate", result.decision.authority_context.mandate_ref.object_id)
+        self.assertEqual(result.decision.reference, result.case.decision_refs[0])
+        self.assertEqual(
+            result.decision,
+            self.path.linked(self.session, self.principal, case_id="case-1")[0],
+        )
+
+    def test_unchanged_retry_replays_but_changed_payload_fails_closed(self) -> None:
+        first = self.path.record(
+            self.session,
+            self.principal,
+            case_id="case-1",
+            command=command(),
+        )
+        self.session.commit()
+        replay = self.path.record(
+            self.session,
+            self.principal,
+            case_id="case-1",
+            command=command(),
+        )
+
+        self.assertTrue(replay.replayed)
+        self.assertEqual(first.decision.reference, replay.decision.reference)
+        with self.assertRaisesRegex(ValueError, "different Decision payload"):
+            self.path.record(
+                self.session,
+                self.principal,
+                case_id="case-1",
+                command=command(result="Permit denied."),
+            )
+
+    def test_stale_case_revision_and_missing_acting_assignment_fail_closed(self) -> None:
+        self.path.record(
+            self.session,
+            self.principal,
+            case_id="case-1",
+            command=command(),
+        )
+        self.session.commit()
+
+        with self.assertRaisesRegex(CaseDecisionError, "revision conflict"):
+            self.path.record(
+                self.session,
+                self.principal,
+                case_id="case-1",
+                command=command(key="another-decision"),
+            )
+        without_assignment = Principal(
+            acting_assignment_id=None,
+            function_assignment_ids=(),
+        )
+        current = get_case(self.session, self.principal, case_id="case-1")
+        assert current is not None
+        with self.assertRaisesRegex(PermissionError, "No active acting assignment"):
+            self.path.record(
+                self.session,
+                without_assignment,
+                case_id="case-1",
+                command=command(
+                    key="third-decision",
+                    expected_case_revision=current.revision,
+                ),
+            )
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_dsar_provider.py

@@ -0,0 +1,471 @@
+from __future__ import annotations
+
+import json
+import unittest
+from dataclasses import dataclass
+from datetime import UTC, datetime, timedelta
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session
+
+from govoplan_cases.backend.domain import CaseGrant, CaseRecord
+from govoplan_cases.backend.dsar_provider import (
+    CASES_DSAR_CAPABILITY,
+    CasesDsarProvider,
+)
+from govoplan_cases.backend.manifest import manifest
+from govoplan_cases.backend.service import (
+    create_case,
+    update_case,
+    upsert_case_status,
+    upsert_case_type,
+)
+from govoplan_core.core.dsar import (
+    DsarErasureActionRef,
+    DsarProvider,
+    DsarRecordRef,
+    DsarSubjectRef,
+)
+from govoplan_core.core.institutional import (
+    EvidenceReference,
+    GovernedContextEnvelope,
+    InstitutionalReference,
+    TemporalRevision,
+)
+from govoplan_core.db.base import Base
+from govoplan_core.privacy.dsar_workflow import (
+    create_data_subject_request,
+    search_data_subject_request,
+)
+
+
+NOW = datetime(2026, 8, 21, 12, 0, tzinfo=UTC)
+
+
+@dataclass
+class _Principal:
+    tenant_id: str
+    account_id: str
+
+
+class _Registry:
+    def __init__(
+        self,
+        provider: CasesDsarProvider,
+        *,
+        cases_active: bool = True,
+    ) -> None:
+        self.provider = provider
+        self.cases_active = cases_active
+
+    def capability_names(self):
+        return (CASES_DSAR_CAPABILITY,)
+
+    def capability_owner(self, name):
+        self._assert_capability(name)
+        return "cases"
+
+    def tenant_entitlement_resolver(self):
+        cases_active = self.cases_active
+
+        class _Resolver:
+            @staticmethod
+            def resolve(session, tenant_id):
+                del session, tenant_id
+                return type(
+                    "State",
+                    (),
+                    {"effective_modules": ("cases",) if cases_active else ()},
+                )()
+
+        return _Resolver()
+
+    def require_tenant_capability(self, name, session, **kwargs):
+        del session, kwargs
+        self._assert_capability(name)
+        return self.provider
+
+    def manifests(self):
+        return (type("Manifest", (), {"id": "cases"})(),)
+
+    @staticmethod
+    def _assert_capability(name: str) -> None:
+        if name != CASES_DSAR_CAPABILITY:
+            raise KeyError(name)
+
+
+def _ref(
+    kind: str,
+    object_id: str,
+    owner: str,
+    *,
+    tenant_id: str,
+    version: str | None = "1",
+) -> InstitutionalReference:
+    return InstitutionalReference(
+        kind=kind,  # type: ignore[arg-type]
+        owner_module=owner,
+        object_id=object_id,
+        tenant_id=tenant_id,
+        version=version,
+        valid_at=NOW,
+    )
+
+
+def _record(
+    case_id: str,
+    *,
+    tenant_id: str = "tenant-1",
+    title: str = "Subject permit",
+    grants: tuple[CaseGrant, ...] = (),
+) -> CaseRecord:
+    case_ref = _ref("case", case_id, "cases", tenant_id=tenant_id)
+    service_ref = _ref("service", "permit", "services", tenant_id=tenant_id)
+    return CaseRecord(
+        reference=case_ref,
+        case_number=f"PERMIT-{case_id}",
+        case_type_key="permit",
+        status_key="open",
+        title=title,
+        access_mode="restricted" if grants else "tenant",
+        access_grants=grants,
+        context=GovernedContextEnvelope(
+            tenant_id=tenant_id,
+            temporal=TemporalRevision(
+                revision="1",
+                valid_from=NOW,
+                recorded_at=NOW,
+                change_reason="private-context-reason-do-not-export",
+            ),
+            service_ref=service_ref,
+            case_ref=case_ref,
+        ),
+        service_ref=service_ref,
+        party_refs=(
+            _ref(
+                "party",
+                "private-party-reference-do-not-export",
+                "parties",
+                tenant_id=tenant_id,
+            ),
+        ),
+        evidence_refs=(
+            EvidenceReference(
+                kind="document",
+                owner_module="files",
+                evidence_id="private-evidence-id-do-not-export",
+                tenant_id=tenant_id,
+                version="1",
+            ),
+        ),
+        opened_at=NOW,
+        recorded_at=NOW,
+        deadline_at=NOW + timedelta(days=30),
+        change_reason="private-create-reason-do-not-export",
+        metadata={"secret": "private-metadata-do-not-export"},
+    )
+
+
+class CasesDsarProviderTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self.engine = create_engine("sqlite+pysqlite:///:memory:")
+        Base.metadata.create_all(self.engine)
+        self.session = Session(self.engine)
+        self.provider = CasesDsarProvider()
+        self.assertIsInstance(self.provider, DsarProvider)
+
+        operator = _Principal("tenant-1", "operator-1")
+        other_operator = _Principal("tenant-1", "operator-other")
+        tenant_two_operator = _Principal("tenant-2", "operator-2")
+        for principal in (operator, tenant_two_operator):
+            upsert_case_status(
+                self.session,
+                principal,
+                status_key="open",
+                label="Open",
+            )
+            upsert_case_type(
+                self.session,
+                principal,
+                type_key="permit",
+                label="Permit",
+                initial_status_key="open",
+                allowed_status_keys=("open",),
+            )
+
+        create_case(
+            self.session,
+            operator,
+            record=_record(
+                "case-1",
+                grants=(
+                    CaseGrant("account", "account-subject", ("read",)),
+                    CaseGrant("identity", "identity-subject", ("read", "update")),
+                ),
+            ),
+            idempotency_key="private-create-key-do-not-export",
+        )
+        update_case(
+            self.session,
+            operator,
+            case_id="case-1",
+            expected_revision=1,
+            changes={
+                "title": "Subject permit revised",
+                "metadata": {"secret": "private-updated-metadata-do-not-export"},
+            },
+            recorded_at=NOW + timedelta(minutes=1),
+            change_reason="private-update-reason-do-not-export",
+            idempotency_key="private-update-key-do-not-export",
+        )
+        create_case(
+            self.session,
+            other_operator,
+            record=_record(
+                "case-unrelated",
+                title="private-unrelated-title-do-not-export",
+                grants=(CaseGrant("account", "account-other", ("read",)),),
+            ),
+            idempotency_key="unrelated-key-do-not-export",
+        )
+        create_case(
+            self.session,
+            tenant_two_operator,
+            record=_record(
+                "case-other-tenant",
+                tenant_id="tenant-2",
+                title="private-other-tenant-title-do-not-export",
+                grants=(CaseGrant("account", "account-subject", ("read",)),),
+            ),
+            idempotency_key="other-tenant-key-do-not-export",
+        )
+        self.session.commit()
+
+    def tearDown(self) -> None:
+        self.session.close()
+        self.engine.dispose()
+
+    def test_subject_access_grants_are_exact_tenant_and_minimized(self) -> None:
+        account_records = self.provider.search_subject(
+            self.session,
+            tenant_id="tenant-1",
+            subject=DsarSubjectRef(account_id="account-subject"),
+        )
+        self.assertEqual(1, len(account_records))
+        self.assertEqual("cases_access_grant", account_records[0].resource_type)
+        self.assertFalse(account_records[0].immutable_evidence)
+        self.assertEqual("account-subject", account_records[0].data["subject_id"])
+
+        identity_records = self.provider.search_subject(
+            self.session,
+            tenant_id="tenant-1",
+            subject=DsarSubjectRef(identity_id="identity-subject"),
+        )
+        self.assertEqual(1, len(identity_records))
+        self.assertEqual("identity", identity_records[0].data["subject_kind"])
+
+        exported = json.dumps(
+            [item.to_dict() for item in account_records + identity_records],
+            sort_keys=True,
+        )
+        self.assertNotIn("private-unrelated-title-do-not-export", exported)
+        self.assertNotIn("private-other-tenant-title-do-not-export", exported)
+        self.assertNotIn("private-metadata-do-not-export", exported)
+        self.assertNotIn("private-evidence-id-do-not-export", exported)
+
+    def test_direct_case_exports_typed_history_without_opaque_content(self) -> None:
+        records = self.provider.search_subject(
+            self.session,
+            tenant_id="tenant-1",
+            subject=DsarSubjectRef(external_references={"cases.case": "case-1"}),
+        )
+
+        types = [item.resource_type for item in records]
+        self.assertEqual(1, types.count("cases_case_identity"))
+        self.assertEqual(2, types.count("cases_case_revision"))
+        self.assertEqual(1, types.count("cases_current_case_fact"))
+        self.assertEqual(2, types.count("cases_timeline_event"))
+        exported = json.dumps([item.to_dict() for item in records], sort_keys=True)
+        self.assertIn("Subject permit revised", exported)
+        self.assertNotIn("account-subject", exported)
+        self.assertNotIn("identity-subject", exported)
+        self.assertNotIn("private-party-reference-do-not-export", exported)
+        self.assertNotIn("private-evidence-id-do-not-export", exported)
+        self.assertNotIn("private-create-reason-do-not-export", exported)
+        self.assertNotIn("private-update-reason-do-not-export", exported)
+        self.assertNotIn("private-create-key-do-not-export", exported)
+        self.assertNotIn("private-update-key-do-not-export", exported)
+        self.assertNotIn("private-metadata-do-not-export", exported)
+        self.assertNotIn("private-updated-metadata-do-not-export", exported)
+
+    def test_operator_attribution_excludes_raw_case_content(self) -> None:
+        records = self.provider.search_subject(
+            self.session,
+            tenant_id="tenant-1",
+            subject=DsarSubjectRef(account_id="operator-1"),
+        )
+        self.assertGreaterEqual(len(records), 5)
+        self.assertTrue(
+            all(
+                item.resource_type
+                in {"cases_operator_attribution", "cases_timeline_event"}
+                for item in records
+            )
+        )
+        exported = json.dumps([item.to_dict() for item in records], sort_keys=True)
+        self.assertNotIn("Subject permit revised", exported)
+        self.assertNotIn("account-subject", exported)
+        self.assertNotIn("identity-subject", exported)
+        self.assertNotIn("private-update-reason-do-not-export", exported)
+        self.assertNotIn("private-updated-metadata-do-not-export", exported)
+
+    def test_direct_and_canonical_selector_conflicts_fail_closed(self) -> None:
+        conflict = self.provider.search_subject(
+            self.session,
+            tenant_id="tenant-1",
+            subject=DsarSubjectRef(
+                account_id="account-subject",
+                external_references={"cases.case": "case-unrelated"},
+            ),
+        )
+        self.assertEqual((), conflict)
+
+        alias_conflict = self.provider.search_subject(
+            self.session,
+            tenant_id="tenant-1",
+            subject=DsarSubjectRef(
+                account_id="account-subject",
+                external_references={"cases.account": "account-other"},
+            ),
+        )
+        self.assertEqual((), alias_conflict)
+
+    def test_planning_retains_history_and_requires_current_fact_review(self) -> None:
+        subject = DsarSubjectRef(external_references={"cases.case": "case-1"})
+        records = self.provider.search_subject(
+            self.session,
+            tenant_id="tenant-1",
+            subject=subject,
+        )
+        actions = self.provider.plan_erasure(
+            self.session,
+            tenant_id="tenant-1",
+            subject=subject,
+            records=records,
+        )
+        self.assertEqual(5, sum(item.kind == "retain" for item in actions))
+        self.assertEqual(1, sum(item.kind == "manual_review" for item in actions))
+        self.assertTrue(all(not item.executable for item in actions))
+        results = self.provider.execute_erasure(
+            self.session,
+            tenant_id="tenant-1",
+            subject=subject,
+            actions=actions,
+            request_id="dsar-cases-1",
+        )
+        self.assertTrue(all(item.status == "blocked" for item in results))
+
+    def test_foreign_records_and_actions_are_rejected(self) -> None:
+        subject = DsarSubjectRef(account_id="account-subject")
+        foreign_record = DsarRecordRef(
+            provider_id="foreign",
+            module_id="foreign",
+            resource_type="foreign",
+            resource_id="foreign-1",
+            category="foreign",
+            title="Foreign record",
+        )
+        with self.assertRaisesRegex(ValueError, "foreign provider record"):
+            self.provider.plan_erasure(
+                self.session,
+                tenant_id="tenant-1",
+                subject=subject,
+                records=(foreign_record,),
+            )
+
+        foreign_action = DsarErasureActionRef(
+            action_id="foreign:delete:1",
+            provider_id="foreign",
+            module_id="foreign",
+            kind="delete",
+            resource_type="foreign",
+            resource_id="foreign-1",
+            title="Delete foreign",
+            rationale="No",
+            executable=True,
+        )
+        with self.assertRaisesRegex(ValueError, "foreign provider action"):
+            self.provider.execute_erasure(
+                self.session,
+                tenant_id="tenant-1",
+                subject=subject,
+                actions=(foreign_action,),
+                request_id="dsar-cases-1",
+            )
+
+    def test_workflow_discovers_only_the_active_tenant_capability(self) -> None:
+        active = create_data_subject_request(
+            self.session,
+            tenant_id="tenant-1",
+            reference="DSAR-CASES-1",
+            request_kind="access",
+            subject=DsarSubjectRef(account_id="account-subject"),
+            purpose="Subject access request",
+            legal_basis=None,
+            due_at=None,
+            requested_by_account_id="privacy-operator",
+        )
+        search_data_subject_request(
+            self.session,
+            registry=_Registry(self.provider),
+            row=active,
+            expected_revision=1,
+        )
+        self.assertEqual("searched", active.status)
+        self.assertEqual(
+            [CASES_DSAR_CAPABILITY], active.coverage["provider_capabilities"]
+        )
+        self.assertEqual(["cases"], active.coverage["covered_modules"])
+
+        inactive = create_data_subject_request(
+            self.session,
+            tenant_id="tenant-1",
+            reference="DSAR-CASES-2",
+            request_kind="access",
+            subject=DsarSubjectRef(account_id="account-subject"),
+            purpose="Inactive module coverage",
+            legal_basis=None,
+            due_at=None,
+            requested_by_account_id="privacy-operator",
+        )
+        search_data_subject_request(
+            self.session,
+            registry=_Registry(self.provider, cases_active=False),
+            row=inactive,
+            expected_revision=1,
+        )
+        self.assertEqual([], inactive.coverage["provider_capabilities"])
+        self.assertEqual(
+            [CASES_DSAR_CAPABILITY],
+            inactive.coverage["inactive_provider_capabilities"],
+        )
+        self.assertEqual(0, inactive.search_result["record_count"])
+
+    def test_manifest_registers_and_documents_the_capability(self) -> None:
+        self.assertIn(CASES_DSAR_CAPABILITY, manifest.capability_factories)
+        self.assertIn(CASES_DSAR_CAPABILITY, manifest.capability_documentation)
+        self.assertIn(
+            CASES_DSAR_CAPABILITY,
+            {item.name for item in manifest.provides_interfaces},
+        )
+        self.assertTrue(
+            any(
+                topic.id == "cases.data-subject-requests"
+                and {"admin", "user"}.issubset(topic.documentation_types)
+                for topic in manifest.documentation
+            )
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_evidence_links.py

@@ -0,0 +1,280 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import UTC, datetime, timedelta
+import unittest
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session
+
+from govoplan_core.core.institutional import (
+    GovernedContextEnvelope,
+    InstitutionalReference,
+    TemporalRevision,
+)
+from govoplan_cases.backend.db.models import (
+    CaseAccessGrant,
+    CaseIdentity,
+    CaseRecordRevision,
+    CaseStatusDefinition,
+    CaseTimelineEntry,
+    CaseTypeDefinition,
+)
+from govoplan_cases.backend.domain import CaseRecord
+from govoplan_cases.backend.evidence_links import (
+    link_case_evidence,
+    linked_source,
+    unlink_case_evidence,
+)
+from govoplan_cases.backend.service import (
+    CaseStoreError,
+    case_history,
+    case_timeline,
+    create_case,
+    update_case,
+    upsert_case_status,
+    upsert_case_type,
+)
+
+
+NOW = datetime(2026, 8, 21, 14, 0, tzinfo=UTC)
+
+
+@dataclass
+class Principal:
+    tenant_id: str = "tenant-1"
+    account_id: str = "account-1"
+    scopes: frozenset[str] = frozenset()
+
+
+def ref(kind: str, object_id: str, owner: str) -> InstitutionalReference:
+    return InstitutionalReference(
+        kind=kind,  # type: ignore[arg-type]
+        owner_module=owner,
+        object_id=object_id,
+        tenant_id="tenant-1",
+        version="1",
+        valid_at=NOW,
+    )
+
+
+def case_record() -> CaseRecord:
+    case_ref = ref("case", "case-1", "cases")
+    return CaseRecord(
+        reference=case_ref,
+        case_number="PERMIT-2026-0001",
+        case_type_key="permit",
+        status_key="open",
+        title="Resident permit",
+        context=GovernedContextEnvelope(
+            tenant_id="tenant-1",
+            temporal=TemporalRevision(
+                revision="1",
+                valid_from=NOW,
+                recorded_at=NOW,
+                change_reason="Case intake.",
+            ),
+            case_ref=case_ref,
+        ),
+        opened_at=NOW,
+        recorded_at=NOW,
+        change_reason="Case created.",
+    )
+
+
+def file_reference(**changes: str) -> dict[str, str]:
+    result = {
+        "owner_module": "files",
+        "kind": "file-version",
+        "object_id": "version-1",
+        "tenant_id": "tenant-1",
+        "version": "version-1",
+        "path": "/files?fileId=file-1&versionId=version-1",
+    }
+    result.update(changes)
+    return result
+
+
+class CaseEvidenceLinkTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self.engine = create_engine("sqlite+pysqlite:///:memory:")
+        for table in (
+            CaseStatusDefinition.__table__,
+            CaseTypeDefinition.__table__,
+            CaseIdentity.__table__,
+            CaseRecordRevision.__table__,
+            CaseAccessGrant.__table__,
+            CaseTimelineEntry.__table__,
+        ):
+            table.create(self.engine)
+        self.session = Session(self.engine)
+        self.principal = Principal()
+        upsert_case_status(
+            self.session,
+            self.principal,
+            status_key="open",
+            label="Open",
+        )
+        upsert_case_type(
+            self.session,
+            self.principal,
+            type_key="permit",
+            label="Permit",
+            initial_status_key="open",
+        )
+        create_case(
+            self.session,
+            self.principal,
+            record=case_record(),
+            idempotency_key="create-case",
+        )
+        self.session.commit()
+
+    def tearDown(self) -> None:
+        self.session.close()
+        self.engine.dispose()
+
+    def link(self, **reference_changes: str) -> CaseRecord:
+        return link_case_evidence(
+            self.session,
+            self.principal,
+            case_id="case-1",
+            expected_revision=1,
+            reference=file_reference(**reference_changes),
+            recorded_at=NOW + timedelta(minutes=1),
+            change_reason="Linked exact file version.",
+            idempotency_key="link-file-1",
+        )
+
+    def test_link_appends_minimized_immutable_revision_and_audit_event(self) -> None:
+        linked = self.link()
+        self.session.commit()
+
+        self.assertEqual(2, linked.revision)
+        self.assertEqual(1, len(linked.evidence_refs))
+        evidence = linked.evidence_refs[0]
+        self.assertEqual("files", evidence.owner_module)
+        self.assertEqual("version-1", evidence.version)
+        self.assertTrue(evidence.evidence_id.startswith("linked-"))
+        source = linked_source(evidence)
+        self.assertEqual("file-version", source["kind"])
+        self.assertEqual("/files?fileId=file-1&versionId=version-1", source["path"])
+        self.assertNotIn("label", evidence.source_ref or "")
+        self.assertNotIn("content", evidence.source_ref or "")
+
+        history = case_history(
+            self.session,
+            self.principal,
+            case_id="case-1",
+        )
+        timeline = case_timeline(
+            self.session,
+            self.principal,
+            case_id="case-1",
+        )
+        self.assertEqual([2, 1], [item.revision for item in history])
+        self.assertEqual("cases.case.updated", timeline[0]["event_type"])
+        self.assertNotIn(evidence.evidence_id, str(timeline[0]["payload"]))
+
+    def test_link_is_replay_safe_and_rejects_duplicate_or_stale_changes(self) -> None:
+        first = self.link()
+        replay = self.link()
+        self.assertEqual(first.reference, replay.reference)
+        self.session.commit()
+
+        with self.assertRaisesRegex(CaseStoreError, "already linked"):
+            link_case_evidence(
+                self.session,
+                self.principal,
+                case_id="case-1",
+                expected_revision=2,
+                reference=file_reference(),
+                recorded_at=NOW + timedelta(minutes=2),
+                change_reason="Duplicate link.",
+                idempotency_key="duplicate-link",
+            )
+
+        updated = update_case(
+            self.session,
+            self.principal,
+            case_id="case-1",
+            expected_revision=2,
+            changes={"title": "Updated permit"},
+            recorded_at=NOW + timedelta(minutes=2),
+            change_reason="Updated title.",
+            idempotency_key="update-title",
+        )
+        self.assertEqual(3, updated.revision)
+        with self.assertRaisesRegex(CaseStoreError, "stale"):
+            link_case_evidence(
+                self.session,
+                self.principal,
+                case_id="case-1",
+                expected_revision=2,
+                reference={
+                    "owner_module": "campaigns",
+                    "kind": "campaign",
+                    "object_id": "campaign-1",
+                    "tenant_id": "tenant-1",
+                    "version": "campaign-version-1",
+                    "path": "/campaigns/campaign-1",
+                },
+                recorded_at=NOW + timedelta(minutes=3),
+                change_reason="Stale link.",
+                idempotency_key="stale-link",
+            )
+
+    def test_rejects_cross_tenant_unsupported_and_malformed_owner_paths(self) -> None:
+        for changes, message in (
+            ({"tenant_id": "tenant-2"}, "cross Case tenants"),
+            ({"owner_module": "unknown"}, "not supported"),
+            ({"path": "/files?versionId=version-1"}, "exact authorized"),
+            ({"path": "https://example.invalid/file"}, "local platform"),
+        ):
+            with self.subTest(changes=changes):
+                with self.assertRaisesRegex(CaseStoreError, message):
+                    self.link(**changes)
+
+    def test_unlink_only_removes_cases_owned_links_and_is_replay_safe(self) -> None:
+        linked = self.link()
+        self.session.commit()
+        evidence_id = linked.evidence_refs[0].evidence_id
+        unlinked = unlink_case_evidence(
+            self.session,
+            self.principal,
+            case_id="case-1",
+            evidence_id=evidence_id,
+            expected_revision=2,
+            recorded_at=NOW + timedelta(minutes=2),
+            change_reason="Removed obsolete link.",
+            idempotency_key="unlink-file-1",
+        )
+        replay = unlink_case_evidence(
+            self.session,
+            self.principal,
+            case_id="case-1",
+            evidence_id=evidence_id,
+            expected_revision=2,
+            recorded_at=NOW + timedelta(minutes=2),
+            change_reason="Removed obsolete link.",
+            idempotency_key="unlink-file-1",
+        )
+        self.assertEqual(3, unlinked.revision)
+        self.assertEqual(unlinked.reference, replay.reference)
+        self.assertEqual((), unlinked.evidence_refs)
+
+        with self.assertRaisesRegex(CaseStoreError, "not found"):
+            unlink_case_evidence(
+                self.session,
+                self.principal,
+                case_id="case-1",
+                evidence_id="ordinary-evidence",
+                expected_revision=3,
+                recorded_at=NOW + timedelta(minutes=3),
+                change_reason="Invalid unlink.",
+                idempotency_key="invalid-unlink",
+            )
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_interface_documentation_contract.py

@@ -10,6 +10,14 @@ REPO_ROOT = Path(__file__).resolve().parents[1]
 
 
 class CasesInterfaceDocumentationContractTests(unittest.TestCase):
+    def test_all_static_topics_have_complete_german_content(self) -> None:
+        for topic in get_manifest().documentation:
+            german = (topic.translations or {}).get("de", {})
+            self.assertEqual({"title", "summary", "body"}, set(german), topic.id)
+            self.assertTrue(
+                all(str(value).strip() for value in german.values()), topic.id
+            )
+
     def test_backend_surfaces_and_hierarchy_remain_declared(self) -> None:
         frontend = get_manifest().frontend
         self.assertIsNotNone(frontend)
@@ -26,6 +34,7 @@ class CasesInterfaceDocumentationContractTests(unittest.TestCase):
                 "cases.detail.timeline",
                 "cases.detail.history",
                 "cases.detail.access",
+                "cases.detail.decision",
             },
             set(surfaces),
         )
@@ -37,6 +46,7 @@ class CasesInterfaceDocumentationContractTests(unittest.TestCase):
             "cases.detail.timeline",
             "cases.detail.history",
             "cases.detail.access",
+            "cases.detail.decision",
         ):
             self.assertEqual("cases.detail", surfaces[surface_id].parent_id)
 
@@ -44,17 +54,23 @@ class CasesInterfaceDocumentationContractTests(unittest.TestCase):
         topics = {topic.id: topic for topic in get_manifest().documentation}
         context = topics["cases.institutional-context"]
         reference = topics["cases.reference.lifecycle-access-and-evidence"]
+        owner_links = topics["cases.workflow.link-owner-references"]
 
         self.assertIn("cases.state.read-only", context.metadata["help_contexts"])
         self.assertIn("cases.field.access-grant", reference.metadata["help_contexts"])
         self.assertIn("update_case", reference.metadata["consequence_classes"])
         self.assertIn("close_case", reference.metadata["consequence_classes"])
         self.assertIn("change_access", reference.metadata["consequence_classes"])
+        self.assertEqual("reference", reference.metadata["kind"])
+        self.assertIn(
+            "link_owner_reference",
+            owner_links.metadata["consequence_classes"],
+        )
 
     def test_webui_uses_shared_help_guard_and_confirmation_components(self) -> None:
-        list_page = (
+        list_page = (REPO_ROOT / "webui/src/features/cases/CasesPage.tsx").read_text(
-            REPO_ROOT / "webui/src/features/cases/CasesPage.tsx"
+            encoding="utf-8"
-        ).read_text(encoding="utf-8")
+        )
         detail_page = (
             REPO_ROOT / "webui/src/features/cases/CaseDetailPage.tsx"
         ).read_text(encoding="utf-8")
@@ -68,6 +84,9 @@ class CasesInterfaceDocumentationContractTests(unittest.TestCase):
             "DocumentationHelpLink",
             "FormField",
             "useUnsavedDraftGuard",
+            "QUICK_ACCESS_RESULT_EVENT",
+            "linkCaseEvidence",
+            "unlinkCaseEvidence",
         ):
             self.assertIn(component, detail_page)
         for component in (

tests/test_record_source.py

@@ -0,0 +1,107 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import UTC, datetime
+import unittest
+from unittest.mock import patch
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session
+
+from govoplan_core.core.records import RecordContractError, RecordSourceLocator
+from govoplan_cases.backend.db.models import CaseIdentity, CaseRecordRevision
+from govoplan_cases.backend.record_source import CasesRecordSource
+
+
+NOW = datetime(2026, 1, 6, 9, 0, tzinfo=UTC)
+
+
+@dataclass
+class Principal:
+    tenant_id: str = "tenant-1"
+
+    def has(self, scope: str) -> bool:
+        return scope == "cases:case:read"
+
+
+class CasesRecordSourceTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self.engine = create_engine("sqlite+pysqlite:///:memory:")
+        CaseIdentity.__table__.create(self.engine)
+        CaseRecordRevision.__table__.create(self.engine)
+        self.session = Session(self.engine)
+        identity = CaseIdentity(
+            id="identity-1",
+            tenant_id="tenant-1",
+            case_id="case-1",
+            case_number="2026/C-1",
+            created_by="account-1",
+        )
+        revision = CaseRecordRevision(
+            id="revision-1",
+            tenant_id="tenant-1",
+            case_id="case-1",
+            identity_id="identity-1",
+            revision=3,
+            case_type_key="permit",
+            status_key="review",
+            title="Permit application",
+            access_mode="restricted",
+            search_text="permit application",
+            opened_at=NOW,
+            recorded_at=NOW,
+            snapshot={
+                "case_id": "case-1",
+                "revision": 3,
+                "title": "Permit application",
+            },
+        )
+        self.session.add_all((identity, revision))
+        self.session.flush()
+
+    def tearDown(self) -> None:
+        self.session.close()
+        self.engine.dispose()
+
+    def locator(self) -> RecordSourceLocator:
+        return RecordSourceLocator(
+            tenant_id="tenant-1",
+            source_module="cases",
+            resource_type="case_revision",
+            resource_id="case-1",
+            source_revision="3",
+        )
+
+    def test_resolves_exact_currently_authorized_case_revision(self) -> None:
+        with patch(
+            "govoplan_cases.backend.record_source.can_access_case", return_value=True
+        ):
+            result = CasesRecordSource().resolve(
+                self.session,
+                Principal(),
+                locator=self.locator(),
+                purpose="preserve decision basis",
+            )
+
+        self.assertEqual("2026/C-1 - Permit application", result.label)
+        self.assertEqual(64, len(result.content_sha256 or ""))
+        self.assertEqual("review", result.metadata["status_key"])
+
+    def test_object_access_is_rechecked_and_fails_closed(self) -> None:
+        with (
+            patch(
+                "govoplan_cases.backend.record_source.can_access_case",
+                return_value=False,
+            ),
+            self.assertRaisesRegex(RecordContractError, "cannot read"),
+        ):
+            CasesRecordSource().resolve(
+                self.session,
+                Principal(),
+                locator=self.locator(),
+                purpose="preserve decision basis",
+            )
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_search_source.py

@@ -0,0 +1,174 @@
+from __future__ import annotations
+
+from datetime import UTC, datetime
+from types import SimpleNamespace
+import unittest
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session
+
+from govoplan_core.auth import ApiPrincipal
+from govoplan_core.core.access import PrincipalRef
+from govoplan_core.core.events import EventObjectRef, EventTenantRef, PlatformEvent
+from govoplan_core.core.institutional import (
+    GovernedContextEnvelope,
+    InstitutionalReference,
+    TemporalRevision,
+)
+from govoplan_core.core.search import (
+    SearchAuthorizationRequest,
+    SearchBackfillRequest,
+    SearchResourceReference,
+)
+from govoplan_cases.backend.db.models import (
+    CaseAccessGrant,
+    CaseIdentity,
+    CaseRecordRevision,
+    CaseStatusDefinition,
+    CaseTimelineEntry,
+    CaseTypeDefinition,
+)
+from govoplan_cases.backend.domain import CaseRecord
+from govoplan_cases.backend.search_source import CasesSearchSource, PROVIDER_ID
+from govoplan_cases.backend.service import (
+    create_case,
+    upsert_case_status,
+    upsert_case_type,
+)
+
+
+NOW = datetime(2026, 8, 6, 10, 0, tzinfo=UTC)
+
+
+class CasesSearchSourceTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self.engine = create_engine("sqlite+pysqlite:///:memory:")
+        for table in (
+            CaseStatusDefinition.__table__,
+            CaseTypeDefinition.__table__,
+            CaseIdentity.__table__,
+            CaseRecordRevision.__table__,
+            CaseAccessGrant.__table__,
+            CaseTimelineEntry.__table__,
+        ):
+            table.create(self.engine)
+        self.session = Session(self.engine)
+        principal = _principal({"cases:case:read", "cases:case:create"})
+        upsert_case_status(
+            self.session,
+            principal,
+            status_key="review",
+            label="Review",
+        )
+        upsert_case_type(
+            self.session,
+            principal,
+            type_key="permit",
+            label="Permit",
+            initial_status_key="review",
+        )
+        case_ref = _ref("case", "case-1", "cases")
+        create_case(
+            self.session,
+            principal,
+            record=CaseRecord(
+                reference=case_ref,
+                case_number="PERMIT-1",
+                case_type_key="permit",
+                status_key="review",
+                title="Permit application",
+                context=GovernedContextEnvelope(
+                    tenant_id="tenant-1",
+                    temporal=TemporalRevision(
+                        revision="1",
+                        valid_from=NOW,
+                        recorded_at=NOW,
+                        change_reason="Created.",
+                    ),
+                    case_ref=case_ref,
+                ),
+                opened_at=NOW,
+                recorded_at=NOW,
+                change_reason="Created.",
+            ),
+            idempotency_key="case-create",
+        )
+        self.session.commit()
+        self.source = CasesSearchSource()
+
+    def tearDown(self) -> None:
+        self.session.close()
+        self.engine.dispose()
+
+    def test_backfill_authorization_and_event_change_are_bounded(self) -> None:
+        page = self.source.backfill(
+            self.session,
+            request=SearchBackfillRequest(
+                tenant_id="tenant-1",
+                provider_id=PROVIDER_ID,
+                resource_type="case",
+                rebuild_id="rebuild-1",
+            ),
+        )
+        self.assertEqual(("case-1",), tuple(item.resource_id for item in page.documents))
+        self.assertEqual("PERMIT-1", page.documents[0].metadata["case_number"])
+        reference = SearchResourceReference(
+            tenant_id="tenant-1",
+            module_id="cases",
+            resource_type="case",
+            resource_id="case-1",
+        )
+        request = SearchAuthorizationRequest(reference=reference, source_revision="1")
+        self.assertTrue(
+            self.source.authorize(
+                self.session,
+                _principal({"cases:case:read"}),
+                requests=(request,),
+            )[reference.key]
+        )
+        self.assertFalse(
+            self.source.authorize(
+                self.session,
+                _principal(set()),
+                requests=(request,),
+            )[reference.key]
+        )
+        changes = self.source.index_changes_for_event(
+            self.session,
+            event=PlatformEvent(
+                type="cases.case.updated",
+                module_id="cases",
+                tenant=EventTenantRef(id="tenant-1"),
+                resource=EventObjectRef(type="case", id="case-1"),
+            ),
+            delivery_key="delivery-1",
+        )
+        self.assertEqual("upsert", changes[0].kind)
+
+
+def _ref(kind: str, object_id: str, owner: str) -> InstitutionalReference:
+    return InstitutionalReference(
+        kind=kind,  # type: ignore[arg-type]
+        owner_module=owner,
+        object_id=object_id,
+        tenant_id="tenant-1",
+        version="1",
+        valid_at=NOW,
+    )
+
+
+def _principal(scopes: set[str]) -> ApiPrincipal:
+    return ApiPrincipal(
+        principal=PrincipalRef(
+            account_id="account-1",
+            membership_id="membership-1",
+            tenant_id="tenant-1",
+            scopes=frozenset(scopes),
+        ),
+        account=SimpleNamespace(id="account-1"),
+        user=SimpleNamespace(id="membership-1"),
+    )
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_ticket_escalation.py

@@ -0,0 +1,108 @@
+from __future__ import annotations
+
+from datetime import UTC, datetime
+from types import SimpleNamespace
+import unittest
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from govoplan_core.core.tickets import TicketCaseEscalationCommand
+from govoplan_core.db.base import Base
+from govoplan_cases.backend.db import models as _case_models
+from govoplan_cases.backend.service import upsert_case_status, upsert_case_type
+from govoplan_cases.backend.ticket_escalation import TicketCaseEscalationProvider
+
+
+NOW = datetime(2026, 8, 22, 10, 0, tzinfo=UTC)
+
+
+class _Principal:
+    def __init__(self, tenant_id: str = "tenant-1", *, can_create: bool = True) -> None:
+        self.tenant_id = tenant_id
+        self.account_id = "case-manager-1"
+        self.identity_id = None
+        self.membership_id = "membership-1"
+        self.group_ids = frozenset()
+        self.role_ids = frozenset()
+        self.function_assignment_ids = frozenset()
+        self.acting_assignment_id = None
+        self.scopes = frozenset({"cases:case:create", "cases:case:read"} if can_create else {"cases:case:read"})
+        self.user = SimpleNamespace(id=self.account_id)
+
+    def has(self, scope: str) -> bool:
+        return scope in self.scopes
+
+
+class TicketEscalationTests(unittest.TestCase):
+    def setUp(self) -> None:
+        engine = create_engine("sqlite+pysqlite:///:memory:", future=True)
+        Base.metadata.create_all(engine)
+        self.Session = sessionmaker(bind=engine, expire_on_commit=False)
+        self.principal = _Principal()
+
+    def test_escalation_creates_one_linked_case_and_replays(self) -> None:
+        with self.Session() as session:
+            upsert_case_status(
+                session,
+                self.principal,
+                status_key="open",
+                label="Open",
+            )
+            upsert_case_type(
+                session,
+                self.principal,
+                type_key="service-request",
+                label="Service request",
+                initial_status_key="open",
+            )
+            command = TicketCaseEscalationCommand(
+                tenant_id="tenant-1",
+                ticket_id="ticket-1",
+                ticket_number="TKT-2026-0001",
+                title="Broken streetlight",
+                case_type_key="service-request",
+                occurred_at=NOW,
+                idempotency_key="escalation-1",
+                handoff_note="Formal procedure required.",
+                metadata={"ticket_revision": 3},
+            )
+            provider = TicketCaseEscalationProvider()
+
+            created = provider.escalate_ticket(session, self.principal, command=command)
+            session.commit()
+            replay = provider.escalate_ticket(session, self.principal, command=command)
+
+            self.assertFalse(created.replayed)
+            self.assertTrue(replay.replayed)
+            self.assertEqual(created.case_id, replay.case_id)
+            self.assertEqual("service-request", created.metadata["case_type_key"])
+            self.assertTrue(created.case_url.startswith("/cases/"))
+            self.assertEqual(1, session.query(_case_models.CaseIdentity).count())
+            current = session.query(_case_models.CaseRecordRevision).filter(
+                _case_models.CaseRecordRevision.case_id == created.case_id,
+                _case_models.CaseRecordRevision.superseded_at.is_(None),
+            ).one()
+            self.assertEqual("tickets", current.snapshot["context"]["work_item_ref"]["owner_module"])
+            self.assertEqual("ticket-1", current.snapshot["metadata"]["source_resource_id"])
+
+    def test_escalation_fails_closed_for_cross_tenant_or_missing_permission(self) -> None:
+        command = TicketCaseEscalationCommand(
+            tenant_id="tenant-1",
+            ticket_id="ticket-1",
+            ticket_number="TKT-1",
+            title="Request",
+            case_type_key="service-request",
+            occurred_at=NOW,
+            idempotency_key="escalation-2",
+        )
+        provider = TicketCaseEscalationProvider()
+        with self.Session() as session:
+            with self.assertRaises(PermissionError):
+                provider.escalate_ticket(session, _Principal("tenant-2"), command=command)
+            with self.assertRaises(PermissionError):
+                provider.escalate_ticket(session, _Principal(can_create=False), command=command)
+
+
+if __name__ == "__main__":
+    unittest.main()

webui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@govoplan/cases-webui",
-  "version": "0.1.15",
+  "version": "0.1.22",
   "private": true,
   "type": "module",
   "main": "src/index.ts",
@@ -14,7 +14,7 @@
     "./styles/cases.css": "./src/styles/cases.css"
   },
   "peerDependencies": {
-    "@govoplan/core-webui": "^0.1.15",
+    "@govoplan/core-webui": "^0.1.30",
     "lucide-react": "^1.23.0",
     "react": ">=19.2.7 <20",
     "react-dom": ">=19.2.7 <20",

webui/src/api/cases.ts

@@ -21,6 +21,17 @@ export type EvidenceReference = {
   evidence_id: string;
   tenant_id: string;
   version?: string | null;
+  source_ref?: string | null;
+  derived_from?: string[];
+};
+
+export type OwnerReference = {
+  ownerModule: string;
+  kind: string;
+  objectId: string;
+  tenantId: string;
+  version?: string | null;
+  path?: string | null;
 };
 
 export type CaseRecord = {
@@ -96,6 +107,33 @@ export type CaseTimelineEntry = {
   payload: Record<string, unknown>;
 };
 
+export type FormalDecision = {
+  reference: InstitutionalReference;
+  temporal: {
+    revision: string;
+    valid_from?: string | null;
+    valid_to?: string | null;
+    recorded_at?: string | null;
+    change_reason?: string | null;
+  };
+  decision_type: string;
+  state: string;
+  assurance_level: string;
+  operative_result?: string | null;
+  reasoning?: string | null;
+  conditions: string[];
+  authority_context: Record<string, unknown>;
+  delivery_refs: string[];
+  remedy_refs: string[];
+  review_refs: string[];
+};
+
+export type CaseDecisionResult = {
+  case: CaseRecord;
+  decision: FormalDecision;
+  replayed: boolean;
+};
+
 export function listCases(
   settings: ApiSettings,
   options: {
@@ -147,6 +185,42 @@ export function caseTimeline(
   return apiFetch(settings, `/api/v1/cases/${encodeURIComponent(caseId)}/timeline`, { signal });
 }
 
+export function listCaseDecisions(
+  settings: ApiSettings,
+  caseId: string,
+  signal?: AbortSignal
+): Promise<{ decisions: FormalDecision[] }> {
+  return apiFetch(
+    settings,
+    `/api/v1/cases/${encodeURIComponent(caseId)}/decisions`,
+    { signal }
+  );
+}
+
+export function recordCaseDecision(
+  settings: ApiSettings,
+  caseId: string,
+  payload: {
+    expected_case_revision: number;
+    effective_at: string;
+    decision_type: string;
+    operative_result: string;
+    reasoning: string;
+    conditions: string[];
+    change_reason: string;
+    idempotency_key: string;
+  }
+): Promise<CaseDecisionResult> {
+  return apiFetch(
+    settings,
+    `/api/v1/cases/${encodeURIComponent(caseId)}/decisions`,
+    {
+      method: "POST",
+      body: JSON.stringify(payload)
+    }
+  );
+}
+
 export function updateCase(
   settings: ApiSettings,
   caseId: string,
@@ -167,6 +241,49 @@ export function updateCase(
   });
 }
 
+export function linkCaseEvidence(
+  settings: ApiSettings,
+  caseId: string,
+  payload: {
+    expected_revision: number;
+    recorded_at: string;
+    change_reason: string;
+    idempotency_key: string;
+    reference: {
+      owner_module: string;
+      kind: string;
+      object_id: string;
+      tenant_id: string;
+      version: string;
+      path: string;
+    };
+  }
+): Promise<CaseRecord> {
+  return apiFetch<CaseRecord>(
+    settings,
+    `/api/v1/cases/${encodeURIComponent(caseId)}/evidence-links`,
+    { method: "POST", body: JSON.stringify(payload) }
+  );
+}
+
+export function unlinkCaseEvidence(
+  settings: ApiSettings,
+  caseId: string,
+  evidenceId: string,
+  payload: {
+    expected_revision: number;
+    recorded_at: string;
+    change_reason: string;
+    idempotency_key: string;
+  }
+): Promise<CaseRecord> {
+  return apiFetch<CaseRecord>(
+    settings,
+    `/api/v1/cases/${encodeURIComponent(caseId)}/evidence-links/${encodeURIComponent(evidenceId)}/unlink`,
+    { method: "POST", body: JSON.stringify(payload) }
+  );
+}
+
 export function caseShareTargetProvider(
   settings: ApiSettings,
   caseId: string,

webui/src/features/cases/CaseDecisionDialog.tsx

@@ -0,0 +1,209 @@
+import { Scale } from "lucide-react";
+import { useEffect, useMemo, useRef, useState } from "react";
+import { FormGrid,
+  Button,
+  ConfirmDialog,
+  Dialog,
+  DismissibleAlert,
+  DocumentationHelpLink,
+  FormField,
+  i18nMessage,
+  type ApiSettings
+} from "@govoplan/core-webui";
+import {
+  recordCaseDecision,
+  type CaseDecisionResult,
+  type CaseRecord
+} from "../../api/cases";
+import { CASES_FIELDS_DOCUMENTATION } from "./interfacePatterns";
+
+
+export default function CaseDecisionDialog({
+  settings,
+  record,
+  open,
+  onClose,
+  onSaved
+}: {
+  settings: ApiSettings;
+  record: CaseRecord;
+  open: boolean;
+  onClose: () => void;
+  onSaved: (result: CaseDecisionResult) => void;
+}) {
+  const [decisionType, setDecisionType] = useState("");
+  const [effectiveAt, setEffectiveAt] = useState("");
+  const [operativeResult, setOperativeResult] = useState("");
+  const [reasoning, setReasoning] = useState("");
+  const [conditions, setConditions] = useState("");
+  const [changeReason, setChangeReason] = useState("");
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState("");
+  const [confirmOpen, setConfirmOpen] = useState(false);
+  const idempotencyKey = useRef(crypto.randomUUID());
+
+  useEffect(() => {
+    if (!open) return;
+    setDecisionType(defaultDecisionType(record));
+    setEffectiveAt(dateTimeLocalValue(new Date()));
+    setOperativeResult("");
+    setReasoning("");
+    setConditions("");
+    setChangeReason("");
+    setError("");
+    setConfirmOpen(false);
+    idempotencyKey.current = crypto.randomUUID();
+  }, [open, record]);
+
+  const disabledReason = useMemo(() => {
+    if (busy) return "The formal Decision is being recorded.";
+    if (
+      !decisionType.trim()
+      || !effectiveAt
+      || !operativeResult.trim()
+      || !reasoning.trim()
+      || !changeReason.trim()
+    ) {
+      return "Complete the Decision type, effective time, result, reasoning, and change reason.";
+    }
+    return undefined;
+  }, [busy, changeReason, decisionType, effectiveAt, operativeResult, reasoning]);
+
+  async function save() {
+    if (disabledReason) return;
+    setBusy(true);
+    setError("");
+    try {
+      const result = await recordCaseDecision(settings, record.reference.object_id, {
+        expected_case_revision: record.revision,
+        effective_at: new Date(effectiveAt).toISOString(),
+        decision_type: decisionType.trim(),
+        operative_result: operativeResult.trim(),
+        reasoning: reasoning.trim(),
+        conditions: conditions.split("\n").map((item) => item.trim()).filter(Boolean),
+        change_reason: changeReason.trim(),
+        idempotency_key: idempotencyKey.current
+      });
+      setConfirmOpen(false);
+      onSaved(result);
+      onClose();
+    } catch (reason) {
+      setConfirmOpen(false);
+      setError(reason instanceof Error ? reason.message : "The formal Decision could not be recorded.");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  return (
+    <>
+      <Dialog
+        open={open}
+        title={i18nMessage("i18n:govoplan-cases.decision_title", { value0: record.case_number })}
+        onClose={onClose}
+        closeDisabled={busy}
+        portal
+        className="case-decision-dialog"
+        footer={
+          <>
+            <Button disabled={busy} onClick={onClose}>Cancel</Button>
+            <Button
+              variant="primary"
+              disabledReason={disabledReason}
+              onClick={() => setConfirmOpen(true)}
+              helpContextId="cases.action.decide"
+            >
+              <Scale size={16} aria-hidden="true" />
+              Record decision
+            </Button>
+          </>
+        }
+      >
+        <div className="case-decision-content" data-help-context-id="cases.decision.editor">
+          <DocumentationHelpLink reference={CASES_FIELDS_DOCUMENTATION} />
+          {error ? <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert> : null}
+          <p className="case-decision-explanation">
+            The server verifies your current acting assignment, the effective Mandate, the exact Case revision, evidence, and legal basis before recording the outcome.
+          </p>
+          <FormGrid columns={2} gap="small" collapseAt="workspace" className="case-decision-grid">
+            <FormField label="Decision type" documentation={CASES_FIELDS_DOCUMENTATION}>
+              <input
+                value={decisionType}
+                disabled={busy}
+                maxLength={120}
+                onChange={(event) => setDecisionType(event.target.value)}
+              />
+            </FormField>
+            <FormField label="Effective at" documentation={CASES_FIELDS_DOCUMENTATION}>
+              <input
+                type="datetime-local"
+                value={effectiveAt}
+                disabled={busy}
+                onChange={(event) => setEffectiveAt(event.target.value)}
+              />
+            </FormField>
+          </FormGrid>
+          <FormField label="Operative result" documentation={CASES_FIELDS_DOCUMENTATION}>
+            <textarea
+              rows={4}
+              value={operativeResult}
+              disabled={busy}
+              maxLength={20_000}
+              onChange={(event) => setOperativeResult(event.target.value)}
+            />
+          </FormField>
+          <FormField label="Reasoning" documentation={CASES_FIELDS_DOCUMENTATION}>
+            <textarea
+              rows={7}
+              value={reasoning}
+              disabled={busy}
+              maxLength={50_000}
+              onChange={(event) => setReasoning(event.target.value)}
+            />
+          </FormField>
+          <FormField label="Conditions (one per line)" documentation={CASES_FIELDS_DOCUMENTATION}>
+            <textarea
+              rows={3}
+              value={conditions}
+              disabled={busy}
+              onChange={(event) => setConditions(event.target.value)}
+            />
+          </FormField>
+          <FormField label="Change reason" documentation={CASES_FIELDS_DOCUMENTATION}>
+            <input
+              value={changeReason}
+              disabled={busy}
+              maxLength={1_000}
+              onChange={(event) => setChangeReason(event.target.value)}
+            />
+          </FormField>
+        </div>
+      </Dialog>
+      <ConfirmDialog
+        open={confirmOpen}
+        title="Record formal Decision"
+        message="Record this formal outcome against the exact Case revision? The protected result and reasoning become an immutable Decisions revision."
+        confirmLabel="Record decision"
+        busy={busy}
+        onCancel={() => setConfirmOpen(false)}
+        onConfirm={() => void save()}
+      />
+    </>
+  );
+}
+
+
+function defaultDecisionType(record: CaseRecord): string {
+  const resultRefs = Array.isArray(record.metadata.result_refs)
+    ? record.metadata.result_refs
+    : [];
+  const result = resultRefs.find((item): item is string => typeof item === "string");
+  if (result) return result.replace(/^decision:/, "");
+  return record.case_type_key.replace(/-application$/, "");
+}
+
+
+function dateTimeLocalValue(value: Date): string {
+  const local = new Date(value.getTime() - value.getTimezoneOffset() * 60_000);
+  return local.toISOString().slice(0, 16);
+}

webui/src/features/cases/CaseDetailPage.tsx

@@ -1,7 +1,7 @@
-import { ArrowLeft, Save, Share2 } from "lucide-react";
+import { Archive, ArrowLeft, ExternalLink, Save, Scale, Share2, Unlink } from "lucide-react";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useParams } from "react-router";
-import {
+import { ActionToolbar,
   ActionBlockerHint,
   Button,
   DocumentationHelpLink,
@@ -11,23 +11,34 @@ import {
   LoadingIndicator,
   PageScrollViewport,
   StatusBadge,
+  QUICK_ACCESS_RESULT_EVENT,
   hasScope,
+  usePlatformModuleInstalled,
   useGuardedNavigate,
+  useRegisterActiveObject,
   useUnsavedDraftGuard,
-  type PlatformRouteContext
+  type PlatformRouteContext,
+  type QuickAccessLaunchContext,
+  type QuickAccessResult
 } from "@govoplan/core-webui";
 import {
   caseHistory,
   caseTimeline,
   getCase,
+  linkCaseEvidence,
+  listCaseDecisions,
   listCaseCatalog,
   updateCase,
+  unlinkCaseEvidence,
   type CaseCatalog,
   type CaseRecord,
   type CaseTimelineEntry,
+  type EvidenceReference,
+  type FormalDecision,
   type InstitutionalReference
 } from "../../api/cases";
 import CaseShareDialog from "./CaseShareDialog";
+import CaseDecisionDialog from "./CaseDecisionDialog";
 import {
   CASES_DOCUMENTATION,
   CASES_FIELDS_DOCUMENTATION,
@@ -42,6 +53,7 @@ export default function CaseDetailPage({ settings, auth }: PlatformRouteContext)
   const [catalog, setCatalog] = useState<CaseCatalog>({ statuses: [], types: [] });
   const [history, setHistory] = useState<CaseRecord[]>([]);
   const [timeline, setTimeline] = useState<CaseTimelineEntry[]>([]);
+  const [decisions, setDecisions] = useState<FormalDecision[]>([]);
   const [title, setTitle] = useState("");
   const [status, setStatus] = useState("");
   const [changeReason, setChangeReason] = useState("");
@@ -49,10 +61,40 @@ export default function CaseDetailPage({ settings, auth }: PlatformRouteContext)
   const [saving, setSaving] = useState(false);
   const [error, setError] = useState("");
   const [shareOpen, setShareOpen] = useState(false);
+  const [decisionOpen, setDecisionOpen] = useState(false);
+  const [linkingEvidence, setLinkingEvidence] = useState(false);
   const idempotencyKey = useRef(crypto.randomUUID());
   const canUpdate = hasScope(auth, "cases:case:update");
   const canClose = hasScope(auth, "cases:case:close");
   const canShare = hasScope(auth, "cases:case:share");
+  const decisionsAvailable = usePlatformModuleInstalled("decisions");
+  const mandatesAvailable = usePlatformModuleInstalled("mandates");
+  const accessAvailable = usePlatformModuleInstalled("access");
+  const recordsAvailable = usePlatformModuleInstalled("records");
+  const filesAvailable = usePlatformModuleInstalled("files");
+  const mailAvailable = usePlatformModuleInstalled("mail");
+  const campaignsAvailable = usePlatformModuleInstalled("campaigns");
+  const canReadDecisions = decisionsAvailable && hasScope(auth, "decisions:decision:read");
+  const decisionDisabledReason = !canUpdate
+    ? "Your account may not update this Case."
+    : !hasScope(auth, "decisions:decision:write")
+      ? "Your account may not record formal Decisions."
+      : !accessAvailable
+        ? "Enable Access to verify the acting assignment."
+        : !mandatesAvailable
+          ? "Enable Mandates to verify formal authority."
+          : undefined;
+  const canFileRecords = recordsAvailable && hasScope(auth, "records:workspace:write");
+  const activeCase = useMemo(() => record ? {
+    ownerModule: record.reference.owner_module,
+    kind: record.reference.kind,
+    objectId: record.reference.object_id,
+    tenantId: record.reference.tenant_id,
+    label: `${record.case_number} · ${record.title}`,
+    version: record.reference.version ?? String(record.revision),
+    path: `/cases/${encodeURIComponent(record.reference.object_id)}`
+  } : null, [record]);
+  useRegisterActiveObject(activeCase);
 
   const load = useCallback((signal?: AbortSignal) => {
     setLoading(true);
@@ -61,19 +103,23 @@ export default function CaseDetailPage({ settings, auth }: PlatformRouteContext)
       getCase(settings, caseId, signal),
       listCaseCatalog(settings, signal),
       caseHistory(settings, caseId, signal),
-      caseTimeline(settings, caseId, signal)
+      caseTimeline(settings, caseId, signal),
+      canReadDecisions
+        ? listCaseDecisions(settings, caseId, signal)
+        : Promise.resolve({ decisions: [] as FormalDecision[] })
     ]).
-      then(([nextRecord, nextCatalog, nextHistory, nextTimeline]) => {
+      then(([nextRecord, nextCatalog, nextHistory, nextTimeline, nextDecisions]) => {
         setRecord(nextRecord);
         setCatalog(nextCatalog);
         setHistory(nextHistory.revisions);
         setTimeline(nextTimeline.entries);
+        setDecisions(nextDecisions.decisions);
         setTitle(nextRecord.title);
         setStatus(nextRecord.status_key);
         setChangeReason("");
       }).
       finally(() => setLoading(false));
-  }, [caseId, settings]);
+  }, [canReadDecisions, caseId, settings]);
 
   useEffect(() => {
     const controller = new AbortController();
@@ -96,6 +142,69 @@ export default function CaseDetailPage({ settings, auth }: PlatformRouteContext)
   const changed = Boolean(record && (title.trim() !== record.title || status !== record.status_key));
   const draftDirty = Boolean(record && canUpdate && (changed || changeReason.trim()));
 
+  useEffect(() => {
+    if (!record || !canUpdate) return;
+    const receiveReference = (event: Event) => {
+      const detail = (event as CustomEvent<{
+        launchContext?: QuickAccessLaunchContext;
+        result?: QuickAccessResult;
+      }>).detail;
+      const sourceCase = detail?.launchContext?.activeObject;
+      const result = detail?.result;
+      if (
+        !sourceCase
+        || sourceCase.ownerModule !== "cases"
+        || sourceCase.kind !== "case"
+        || sourceCase.objectId !== record.reference.object_id
+        || sourceCase.tenantId !== record.reference.tenant_id
+        || result?.outcome !== "completed"
+        || result.action !== "selected"
+        || !result.reference
+      ) return;
+      if (draftDirty) {
+        setError(
+          "Save or discard the current Case edits before linking the selected reference."
+        );
+        return;
+      }
+      const reference = result.reference;
+      if (!reference.version || !reference.path) {
+        setError("The selected owner reference is not an exact versioned link.");
+        return;
+      }
+      setLinkingEvidence(true);
+      setError("");
+      void linkCaseEvidence(settings, caseId, {
+        expected_revision: record.revision,
+        recorded_at: new Date().toISOString(),
+        change_reason: `Linked ${reference.ownerModule}.${reference.kind} through Quick Access.`,
+        idempotency_key: crypto.randomUUID(),
+        reference: {
+          owner_module: reference.ownerModule,
+          kind: reference.kind,
+          object_id: reference.objectId,
+          tenant_id: reference.tenantId,
+          version: reference.version,
+          path: reference.path
+        }
+      }).then((saved) => {
+        setRecord(saved);
+        setTitle(saved.title);
+        setStatus(saved.status_key);
+        return load();
+      }).catch((reason) => {
+        setError(reason instanceof Error
+          ? reason.message
+          : "The selected reference could not be linked to this Case.");
+      }).finally(() => setLinkingEvidence(false));
+    };
+    window.addEventListener(QUICK_ACCESS_RESULT_EVENT, receiveReference);
+    return () => window.removeEventListener(
+      QUICK_ACCESS_RESULT_EVENT,
+      receiveReference
+    );
+  }, [canUpdate, caseId, draftDirty, load, record, settings]);
+
   function discardDraft() {
     if (!record) return;
     setTitle(record.title);
@@ -137,6 +246,36 @@ export default function CaseDetailPage({ settings, auth }: PlatformRouteContext)
     }
   }
 
+  async function unlinkEvidence(evidence: EvidenceReference): Promise<void> {
+    if (!record || draftDirty || linkingEvidence) return;
+    if (!window.confirm("Remove this owner reference from the Case? The owner data is not deleted.")) return;
+    setLinkingEvidence(true);
+    setError("");
+    try {
+      const saved = await unlinkCaseEvidence(
+        settings,
+        caseId,
+        evidence.evidence_id,
+        {
+          expected_revision: record.revision,
+          recorded_at: new Date().toISOString(),
+          change_reason: `Unlinked ${evidence.owner_module} reference from the Case.`,
+          idempotency_key: crypto.randomUUID()
+        }
+      );
+      setRecord(saved);
+      setTitle(saved.title);
+      setStatus(saved.status_key);
+      await load();
+    } catch (reason) {
+      setError(reason instanceof Error
+        ? reason.message
+        : "The owner reference could not be removed from this Case.");
+    } finally {
+      setLinkingEvidence(false);
+    }
+  }
+
   useUnsavedDraftGuard({
     dirty: draftDirty,
     title: "i18n:govoplan-cases.unsaved_title",
@@ -156,21 +295,41 @@ export default function CaseDetailPage({ settings, auth }: PlatformRouteContext)
   return (
     <main className="cases-page">
       <div className="case-detail-shell">
-        <div className="case-detail-toolbar">
+        <ActionToolbar className="case-detail-toolbar">
           <button type="button" className="btn btn-ghost" onClick={() => navigate("/cases")}>
             <ArrowLeft size={16} aria-hidden="true" />
             Cases
           </button>
           {record && <span>{record.case_number}</span>}
-          {record ? <IconButton
+          {record ? (
+            <div className="case-detail-actions">
+              {decisionsAvailable ? (
+                <IconButton
+                  label="Record formal decision"
+                  icon={<Scale size={16} />}
+                  disabledReason={decisionDisabledReason}
+                  onClick={() => setDecisionOpen(true)}
+                  helpContextId="cases.action.decide"
+                />
+              ) : null}
+              {canFileRecords ? (
+                <IconButton
+                  label="File Case in eAkte"
+                  icon={<Archive size={16} />}
+                  onClick={() => navigate(recordFilingPath(record.reference, record.case_number, "cases", "case_revision"))}
+                  helpContextId="records.action.file"
+                />
+              ) : null}
+              <IconButton
                 label="Manage case access"
                 icon={<Share2 size={16} />}
-            className="case-share-button"
                 disabledReason={!canShare ? CASES_I18N.shareReason : undefined}
                 onClick={() => setShareOpen(true)}
-          /> : null}
+              />
-          <DocumentationHelpLink reference={CASES_DOCUMENTATION} />
             </div>
+          ) : null}
+          <DocumentationHelpLink reference={CASES_DOCUMENTATION} />
+        </ActionToolbar>
         <PageScrollViewport className="case-detail-viewport">
           {error &&
             <DismissibleAlert tone="danger" resetKey={error}>
@@ -250,7 +409,30 @@ export default function CaseDetailPage({ settings, auth }: PlatformRouteContext)
 
                 <ReferenceSection title="Parties" references={record.party_refs} />
                 <ReferenceSection title="Assignments" references={record.assignment_refs} />
+                <EvidenceSection
+                  references={record.evidence_refs}
+                  providers={{
+                    files: filesAvailable,
+                    mail: mailAvailable,
+                    campaigns: campaignsAvailable
+                  }}
+                  canUnlink={canUpdate && !draftDirty && !linkingEvidence}
+                  onUnlink={(evidence) => void unlinkEvidence(evidence)}
+                />
+                {canReadDecisions ? (
+                  <DecisionSection
+                    decisions={decisions}
+                    canFile={canFileRecords}
+                    onFile={(decision) => navigate(recordFilingPath(
+                      decision.reference,
+                      `${humanize(decision.decision_type)} Decision`,
+                      "decisions",
+                      "decision_revision"
+                    ))}
+                  />
+                ) : (
                   <ReferenceSection title="Decisions" references={record.decision_refs} />
+                )}
                 <ReferenceSection title="Records" references={record.record_refs} />
               </section>
 
@@ -298,6 +480,24 @@ export default function CaseDetailPage({ settings, auth }: PlatformRouteContext)
           }}
         />
       ) : null}
+      {record ? (
+        <CaseDecisionDialog
+          settings={settings}
+          record={record}
+          open={decisionOpen}
+          onClose={() => setDecisionOpen(false)}
+          onSaved={(result) => {
+            setRecord(result.case);
+            setDecisions((current) => [
+              result.decision,
+              ...current.filter((item) => item.reference.object_id !== result.decision.reference.object_id)
+            ]);
+            void load().catch((reason) => {
+              setError(reason instanceof Error ? reason.message : "Case could not be reloaded.");
+            });
+          }}
+        />
+      ) : null}
     </main>
   );
 }
@@ -323,6 +523,151 @@ function ReferenceSection({ title, references }: { title: string; references: In
   );
 }
 
+function EvidenceSection({
+  references,
+  providers,
+  canUnlink,
+  onUnlink
+}: {
+  references: EvidenceReference[];
+  providers: Record<string, boolean>;
+  canUnlink: boolean;
+  onUnlink: (reference: EvidenceReference) => void;
+}) {
+  return (
+    <section className="case-reference-section case-evidence-section">
+      <h2>Linked files, mail, and campaigns</h2>
+      <p className="muted small-note">
+        Select an authorized exact item in Quick Access to link it. Cases stores
+        only the owner reference; the owning module checks access again when opened.
+      </p>
+      {references.length ? (
+        <div className="case-reference-list">
+          {references.map((reference) => {
+            const source = linkedEvidenceSource(reference);
+            const available = source
+              ? providers[source.owner_module] !== false
+              : providers[reference.owner_module] !== false;
+            return (
+              <span key={`${reference.owner_module}:${reference.evidence_id}:${reference.version ?? "current"}`}>
+                <strong>{humanize(source?.kind ?? reference.kind)}</strong>
+                <small>{reference.owner_module} · version {reference.version ?? "not pinned"}</small>
+                {source && available ? (
+                  <a href={source.path} className="btn btn-secondary">
+                    <ExternalLink size={15} aria-hidden="true" /> Open in owner
+                  </a>
+                ) : source ? (
+                  <small>Owner module unavailable; the reference remains in Case history.</small>
+                ) : null}
+                {source ? (
+                  <Button
+                    variant="danger"
+                    disabled={!canUnlink}
+                    disabledReason={!canUnlink
+                      ? "Save or discard Case edits before removing a link."
+                      : undefined}
+                    onClick={() => onUnlink(reference)}
+                  >
+                    <Unlink size={15} aria-hidden="true" /> Unlink
+                  </Button>
+                ) : null}
+              </span>
+            );
+          })}
+        </div>
+      ) : (
+        <p className="muted">No owner references are linked.</p>
+      )}
+    </section>
+  );
+}
+
+function linkedEvidenceSource(reference: EvidenceReference): {
+  owner_module: string;
+  kind: string;
+  path: string;
+} | null {
+  if (!reference.source_ref) return null;
+  try {
+    const value = JSON.parse(reference.source_ref) as Record<string, unknown>;
+    const owner = String(value.owner_module ?? "");
+    const kind = String(value.kind ?? "");
+    const path = String(value.path ?? "");
+    if (
+      value.contract !== "cases.quick-access-reference.v1"
+      || !owner
+      || !kind
+      || !path.startsWith("/")
+      || path.startsWith("//")
+    ) return null;
+    return { owner_module: owner, kind, path };
+  } catch {
+    return null;
+  }
+}
+
+function DecisionSection({
+  decisions,
+  canFile,
+  onFile
+}: {
+  decisions: FormalDecision[];
+  canFile: boolean;
+  onFile: (decision: FormalDecision) => void;
+}) {
+  if (decisions.length === 0) return null;
+  return (
+    <section className="case-reference-section">
+      <h2>Decisions</h2>
+      <div className="case-decision-list">
+        {decisions.map((decision) => (
+          <article key={`${decision.reference.object_id}:${decision.reference.version ?? "current"}`}>
+            <div className="case-decision-heading">
+              <div>
+                <strong>{humanize(decision.decision_type)}</strong>
+                <span>Revision {decision.reference.version ?? decision.temporal.revision}</span>
+              </div>
+              <StatusBadge status={decision.state === "effective" || decision.state === "decided" ? "active" : "inactive"} label={humanize(decision.state)} />
+              {canFile ? (
+                <IconButton
+                  label="File Decision in eAkte"
+                  icon={<Archive size={16} />}
+                  onClick={() => onFile(decision)}
+                  helpContextId="records.action.file"
+                />
+              ) : null}
+            </div>
+            {decision.operative_result ? <p><strong>Operative result</strong>{decision.operative_result}</p> : null}
+            {decision.reasoning ? <p><strong>Reasoning</strong>{decision.reasoning}</p> : null}
+            {!decision.operative_result && !decision.reasoning ? (
+              <p className="case-decision-protected">Protected Decision details require the sensitive-read permission.</p>
+            ) : null}
+            {decision.conditions.length > 0 ? (
+              <ul>{decision.conditions.map((condition) => <li key={condition}>{condition}</li>)}</ul>
+            ) : null}
+          </article>
+        ))}
+      </div>
+    </section>
+  );
+}
+
+function recordFilingPath(
+  reference: InstitutionalReference,
+  label: string,
+  sourceModule: string,
+  resourceType: string
+): string {
+  const query = new URLSearchParams({
+    sourceModule,
+    resourceType,
+    resourceId: reference.object_id,
+    sourceRevision: reference.version ?? "",
+    sourceLabel: label
+  });
+  return `/records?${query.toString()}`;
+}
+
 function formatDateTime(value?: string | null): string {
   return value ? new Intl.DateTimeFormat(undefined, { dateStyle: "medium", timeStyle: "short" }).format(new Date(value)) : "-";
 }

webui/src/features/cases/CasesPage.tsx

@@ -1,14 +1,20 @@
 import { Search } from "lucide-react";
 import { useEffect, useMemo, useState, type FormEvent } from "react";
-import {
+import { Button,
-  Button,
   DocumentationHelpLink,
   DismissibleAlert,
+  FilterBar,
   LoadingIndicator,
   PageScrollViewport,
+  SelectionList,
+  SelectionListItem,
+  SelectionListItemContent,
+  StatePanel,
   StatusBadge,
   i18nMessage,
   useGuardedNavigate,
+  WorkspaceActionBar,
+  WorkspaceFrame,
   type PlatformRouteContext
 } from "@govoplan/core-webui";
 import {
@@ -30,6 +36,7 @@ export default function CasesPage({ settings }: PlatformRouteContext) {
   const [total, setTotal] = useState(0);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState("");
+  const [reloadKey, setReloadKey] = useState(0);
 
   useEffect(() => {
     const controller = new AbortController();
@@ -55,7 +62,7 @@ export default function CasesPage({ settings }: PlatformRouteContext) {
       }).
       finally(() => setLoading(false));
     return () => controller.abort();
-  }, [settings, status, submittedQuery]);
+  }, [reloadKey, settings, status, submittedQuery]);
 
   const statusLabels = useMemo(
     () => new Map(catalog.statuses.map((item) => [item.status_key, item])),
@@ -73,9 +80,15 @@ export default function CasesPage({ settings }: PlatformRouteContext) {
 
   return (
     <main className="cases-page">
-      <div className="cases-shell">
+      <WorkspaceFrame className="cases-shell" label="Cases" interfaceId="cases.catalogue" helpContextId="cases.page.catalogue" helpModuleId="cases">
-        <div className="cases-toolbar">
+        <WorkspaceActionBar
-          <form className="cases-search" onSubmit={submit}>
+          scope="collection-pane"
+          variant="collection"
+          refreshable
+          reloadAction={{ onReload: () => setReloadKey((value) => value + 1), loading }}
+          className="cases-toolbar"
+          contextActions={<>
+            <FilterBar as="form" surface="control" wrap="never" width="default" className="cases-search" onSubmit={submit}>
             <Search size={17} aria-hidden="true" />
             <input
               value={query}
@@ -90,7 +103,7 @@ export default function CasesPage({ settings }: PlatformRouteContext) {
             >
               Search
             </Button>
-          </form>
+            </FilterBar>
             <label className="cases-status-filter">
             <span>Status</span>
             <select value={status} onChange={(event) => setStatus(event.target.value)}>
@@ -101,8 +114,9 @@ export default function CasesPage({ settings }: PlatformRouteContext) {
             </select>
             </label>
             <span className="cases-count">{i18nMessage("i18n:govoplan-cases.case_count", { value0: total })}</span>
-          <DocumentationHelpLink reference={CASES_DOCUMENTATION} />
+          </>}
-        </div>
+          helpAction={<DocumentationHelpLink reference={CASES_DOCUMENTATION} />}
+        />
         <PageScrollViewport className="cases-list-viewport">
           {error &&
             <DismissibleAlert tone="error" onDismiss={() => setError("")}>
@@ -111,36 +125,29 @@ export default function CasesPage({ settings }: PlatformRouteContext) {
           }
           {loading && <LoadingIndicator label="Loading cases" />}
           {!loading && !error && cases.length === 0 &&
-            <div className="cases-empty">No matching cases.</div>
+            <StatePanel size="compact" description="No matching cases." />
           }
           {!loading && cases.length > 0 &&
-            <div className="cases-list" role="list">
+            <SelectionList variant="navigation" label="Cases">
               {cases.map((item) => {
                 const statusDefinition = statusLabels.get(item.status_key);
                 return (
-                  <button
+                  <SelectionListItem
-                    type="button"
+                    selected={false}
-                    className="case-list-row"
-                    role="listitem"
                     key={item.reference.object_id}
                     onClick={() => navigate(`/cases/${encodeURIComponent(item.reference.object_id)}`)}>
-                    <div className="case-list-primary">
+                    <SelectionListItemContent title={item.title} description={`${item.case_number} · ${typeLabels.get(item.case_type_key) ?? humanize(item.case_type_key)} · ${formatDate(item.deadline_at)}`} />
-                      <strong>{item.title}</strong>
-                      <span>{item.case_number}</span>
-                    </div>
-                    <span>{typeLabels.get(item.case_type_key) ?? humanize(item.case_type_key)}</span>
-                    <span>{formatDate(item.deadline_at)}</span>
                     <StatusBadge
                       status={statusDefinition?.terminal ? "inactive" : "active"}
                       label={statusDefinition?.label ?? humanize(item.status_key)}
                     />
-                  </button>
+                  </SelectionListItem>
                 );
               })}
-            </div>
+            </SelectionList>
           }
         </PageScrollViewport>
-      </div>
+      </WorkspaceFrame>
     </main>
   );
 }

webui/src/i18n/generatedTranslations.ts

@@ -12,6 +12,8 @@ const en = {
   "i18n:govoplan-cases.timeline": "Case timeline",
   "i18n:govoplan-cases.history": "Immutable case history",
   "i18n:govoplan-cases.access": "Case access",
+  "i18n:govoplan-cases.decision": "Record formal Decision",
+  "i18n:govoplan-cases.decision_title": "Record formal Decision - {value0}",
   "i18n:govoplan-cases.loading_reason": "The case is still loading.",
   "i18n:govoplan-cases.saving_reason": "The case change is still being saved.",
   "i18n:govoplan-cases.update_reason": "Your account may inspect this case but may not change its title or lifecycle state.",
@@ -78,7 +80,27 @@ const en = {
   "Target": "Target",
   "Permission": "Permission",
   "Save access": "Save access",
-  "No explicit access grants.": "No explicit access grants."
+  "No explicit access grants.": "No explicit access grants.",
+  "Record formal decision": "Record formal decision",
+  "File Case in eAkte": "File Case in eAkte",
+  "File Decision in eAkte": "File Decision in eAkte",
+  "Record decision": "Record decision",
+  "The formal Decision is being recorded.": "The formal Decision is being recorded.",
+  "Complete the Decision type, effective time, result, reasoning, and change reason.": "Complete the Decision type, effective time, result, reasoning, and change reason.",
+  "The formal Decision could not be recorded.": "The formal Decision could not be recorded.",
+  "The server verifies your current acting assignment, the effective Mandate, the exact Case revision, evidence, and legal basis before recording the outcome.": "The server verifies your current acting assignment, the effective Mandate, the exact Case revision, evidence, and legal basis before recording the outcome.",
+  "Decision type": "Decision type",
+  "Effective at": "Effective at",
+  "Operative result": "Operative result",
+  "Reasoning": "Reasoning",
+  "Conditions (one per line)": "Conditions (one per line)",
+  "Record formal Decision": "Record formal Decision",
+  "Record this formal outcome against the exact Case revision? The protected result and reasoning become an immutable Decisions revision.": "Record this formal outcome against the exact Case revision? The protected result and reasoning become an immutable Decisions revision.",
+  "Protected Decision details require the sensitive-read permission.": "Protected Decision details require the sensitive-read permission.",
+  "Your account may not update this Case.": "Your account may not update this Case.",
+  "Your account may not record formal Decisions.": "Your account may not record formal Decisions.",
+  "Enable Access to verify the acting assignment.": "Enable Access to verify the acting assignment.",
+  "Enable Mandates to verify formal authority.": "Enable Mandates to verify formal authority."
 } as const;
 
 const de: Record<keyof typeof en, string> = {
@@ -93,6 +115,8 @@ const de: Record<keyof typeof en, string> = {
   "i18n:govoplan-cases.timeline": "Vorgangszeitachse",
   "i18n:govoplan-cases.history": "Unveränderliche Vorgangshistorie",
   "i18n:govoplan-cases.access": "Vorgangszugriff",
+  "i18n:govoplan-cases.decision": "Formelle Entscheidung erfassen",
+  "i18n:govoplan-cases.decision_title": "Formelle Entscheidung erfassen - {value0}",
   "i18n:govoplan-cases.loading_reason": "Der Vorgang wird noch geladen.",
   "i18n:govoplan-cases.saving_reason": "Die Vorgangsänderung wird noch gespeichert.",
   "i18n:govoplan-cases.update_reason": "Ihr Konto darf diesen Vorgang einsehen, aber Titel und Status nicht ändern.",
@@ -159,7 +183,27 @@ const de: Record<keyof typeof en, string> = {
   "Target": "Ziel",
   "Permission": "Berechtigung",
   "Save access": "Zugriff speichern",
-  "No explicit access grants.": "Keine ausdrücklichen Zugriffsfreigaben."
+  "No explicit access grants.": "Keine ausdrücklichen Zugriffsfreigaben.",
+  "Record formal decision": "Formelle Entscheidung erfassen",
+  "File Case in eAkte": "Vorgang in eAkte verakten",
+  "File Decision in eAkte": "Entscheidung in eAkte verakten",
+  "Record decision": "Entscheidung erfassen",
+  "The formal Decision is being recorded.": "Die formelle Entscheidung wird erfasst.",
+  "Complete the Decision type, effective time, result, reasoning, and change reason.": "Vervollständigen Sie Entscheidungsart, Gültigkeitszeitpunkt, Entscheidungssatz, Begründung und Änderungsbegründung.",
+  "The formal Decision could not be recorded.": "Die formelle Entscheidung konnte nicht erfasst werden.",
+  "The server verifies your current acting assignment, the effective Mandate, the exact Case revision, evidence, and legal basis before recording the outcome.": "Der Server prüft vor der Erfassung den aktuellen Funktionskontext, das wirksame Mandat, die exakte Vorgangsrevision, die Nachweise und die Rechtsgrundlage.",
+  "Decision type": "Entscheidungsart",
+  "Effective at": "Gültig ab",
+  "Operative result": "Entscheidungssatz",
+  "Reasoning": "Begründung",
+  "Conditions (one per line)": "Nebenbestimmungen (eine pro Zeile)",
+  "Record formal Decision": "Formelle Entscheidung erfassen",
+  "Record this formal outcome against the exact Case revision? The protected result and reasoning become an immutable Decisions revision.": "Diese formelle Entscheidung zur exakten Vorgangsrevision erfassen? Entscheidungssatz und Begründung werden als unveränderliche Entscheidungsrevision gespeichert.",
+  "Protected Decision details require the sensitive-read permission.": "Geschützte Entscheidungsinhalte erfordern die Berechtigung zum Lesen sensibler Entscheidungen.",
+  "Your account may not update this Case.": "Ihr Konto darf diesen Vorgang nicht ändern.",
+  "Your account may not record formal Decisions.": "Ihr Konto darf keine formellen Entscheidungen erfassen.",
+  "Enable Access to verify the acting assignment.": "Aktivieren Sie Access, damit der Funktionskontext geprüft werden kann.",
+  "Enable Mandates to verify formal authority.": "Aktivieren Sie Mandates, damit die formelle Zuständigkeit geprüft werden kann."
 };
 
 export const generatedTranslations: PlatformTranslations = { en, de };

webui/src/module.ts

@@ -10,7 +10,7 @@ const CaseDetailPage = lazy(() => import("./features/cases/CaseDetailPage"));
 export const casesModule: PlatformWebModule = {
   id: "cases",
   label: "i18n:govoplan-cases.cases",
-  version: "0.1.8",
+  version: "0.1.21",
   optionalDependencies: [
     "access",
     "addresses",
@@ -19,7 +19,8 @@ export const casesModule: PlatformWebModule = {
     "mandates",
     "decisions",
     "forms_runtime",
-    "workflow_engine"
+    "workflow_engine",
+    "records"
   ],
   translations: generatedTranslations,
   routes: [
@@ -58,7 +59,8 @@ export const casesModule: PlatformWebModule = {
     { id: "cases.detail.references", moduleId: "cases", kind: "section", label: "i18n:govoplan-cases.references", parentId: "cases.detail", order: 30 },
     { id: "cases.detail.timeline", moduleId: "cases", kind: "section", label: "i18n:govoplan-cases.timeline", parentId: "cases.detail", order: 40 },
     { id: "cases.detail.history", moduleId: "cases", kind: "section", label: "i18n:govoplan-cases.history", parentId: "cases.detail", order: 50 },
-    { id: "cases.detail.access", moduleId: "cases", kind: "action", label: "i18n:govoplan-cases.access", parentId: "cases.detail", order: 60 }
+    { id: "cases.detail.access", moduleId: "cases", kind: "action", label: "i18n:govoplan-cases.access", parentId: "cases.detail", order: 60 },
+    { id: "cases.detail.decision", moduleId: "cases", kind: "action", label: "i18n:govoplan-cases.decision", parentId: "cases.detail", order: 70 }
   ]
 };
 

webui/src/styles/cases.css

@@ -1,19 +1,16 @@
 .cases-page,
-.cases-shell,
 .case-detail-shell {
   height: 100%;
   min-height: 0;
   overflow: hidden;
 }
 
-.cases-shell,
 .case-detail-shell {
   display: flex;
   flex-direction: column;
   background: var(--surface);
 }
 
-.cases-toolbar,
 .case-detail-toolbar {
   display: flex;
   align-items: center;
@@ -24,17 +21,7 @@
   background: var(--surface-raised);
 }
 
-.cases-search {
+.cases-search { flex: 1 1 560px; }
-  display: flex;
-  align-items: center;
-  gap: 8px;
-  width: min(560px, 100%);
-}
-
-.cases-search input {
-  min-width: 120px;
-  flex: 1;
-}
 
 .cases-status-filter {
   display: flex;
@@ -52,7 +39,10 @@
   margin-left: auto;
 }
 
-.case-share-button {
+.case-detail-actions {
+  display: flex;
+  align-items: center;
+  gap: 6px;
   margin-left: auto;
 }
 
@@ -63,58 +53,6 @@
   padding: 16px 18px 24px;
 }
 
-.cases-list {
-  overflow: hidden;
-  border: 1px solid var(--border);
-  border-radius: 6px;
-  background: var(--surface-raised);
-}
-
-.case-list-row {
-  display: grid;
-  grid-template-columns: minmax(260px, 2fr) minmax(150px, 1fr) minmax(150px, 0.8fr) auto;
-  align-items: center;
-  gap: 16px;
-  width: 100%;
-  min-height: 66px;
-  padding: 10px 14px;
-  border: 0;
-  border-bottom: 1px solid var(--border);
-  background: transparent;
-  color: inherit;
-  text-align: left;
-  cursor: pointer;
-}
-
-.case-list-row:last-child {
-  border-bottom: 0;
-}
-
-.case-list-row:hover,
-.case-list-row:focus-visible {
-  background: var(--hover-bg);
-}
-
-.case-list-primary {
-  display: flex;
-  min-width: 0;
-  flex-direction: column;
-  gap: 3px;
-}
-
-.case-list-primary strong,
-.case-list-primary span {
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-
-.case-list-primary span,
-.case-list-row > span:not(.status-badge) {
-  color: var(--text-soft);
-  font-size: 0.84rem;
-}
-
 .case-detail-content {
   display: grid;
   grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
@@ -159,7 +97,7 @@
   margin-top: 16px;
   padding: 14px;
   border: 1px solid var(--border);
-  border-radius: 6px;
+  border-radius: var(--radius-compact);
   background: var(--surface-raised);
 }
 
@@ -190,7 +128,7 @@
   margin-top: 18px;
   background: var(--border);
   border: 1px solid var(--border);
-  border-radius: 6px;
+  border-radius: var(--radius-compact);
   overflow: hidden;
 }
 
@@ -238,6 +176,15 @@
   border-bottom: 1px solid var(--border);
 }
 
+.case-evidence-section .case-reference-list > span {
+  align-items: center;
+  flex-wrap: wrap;
+}
+
+.case-evidence-section .case-reference-list small {
+  color: var(--text-soft);
+}
+
 .case-timeline {
   margin: 0;
   padding: 0;
@@ -254,17 +201,83 @@
   border-left: 2px solid var(--accent);
 }
 
-.cases-empty {
-  padding: 36px 0;
-  color: var(--text-soft);
-  text-align: center;
-}
-
 .case-share-dialog {
   width: min(860px, calc(100vw - 32px));
   max-height: min(760px, calc(100vh - 32px));
 }
 
+.case-decision-dialog {
+  width: min(900px, calc(100vw - 32px));
+  max-height: min(820px, calc(100vh - 32px));
+}
+
+.case-decision-content {
+  display: flex;
+  min-height: 0;
+  flex-direction: column;
+  gap: 14px;
+}
+
+.case-decision-explanation,
+.case-decision-protected {
+  margin: 0;
+  color: var(--text-soft);
+  font-size: 0.84rem;
+}
+
+.case-decision-grid {
+  grid-template-columns: minmax(0, 1fr) minmax(210px, 0.7fr);
+}
+
+.case-decision-content textarea {
+  resize: vertical;
+}
+
+.case-decision-list {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.case-decision-list > article {
+  padding: 12px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-compact);
+  background: var(--surface-raised);
+}
+
+.case-decision-heading {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.case-decision-heading > div:first-child {
+  display: flex;
+  min-width: 0;
+  flex: 1;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.case-decision-heading span {
+  color: var(--text-soft);
+  font-size: 0.78rem;
+}
+
+.case-decision-list p {
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+  margin: 10px 0 0;
+  white-space: pre-wrap;
+}
+
+.case-decision-list ul {
+  margin: 10px 0 0;
+  padding-left: 20px;
+}
+
 .case-share-content {
   display: flex;
   min-height: 0;
@@ -322,28 +335,11 @@
   font-size: 0.76rem;
 }
 
-@media (max-width: 860px) {
+@media (max-width: 900px) {
-  .cases-toolbar {
-    align-items: stretch;
-    flex-direction: column;
-  }
-
-  .cases-search {
-    width: 100%;
-  }
-
   .cases-count {
     margin-left: 0;
   }
 
-  .case-list-row {
-    grid-template-columns: minmax(0, 1fr) auto;
-  }
-
-  .case-list-row > span:not(.status-badge) {
-    display: none;
-  }
-
   .case-detail-content {
     grid-template-columns: 1fr;
   }
@@ -352,6 +348,10 @@
     grid-template-columns: 1fr;
   }
 
+  .case-detail-toolbar {
+    flex-wrap: wrap;
+  }
+
   .case-share-add-row .icon-button {
     justify-self: end;
   }