feat: implement procedure party registry

src/govoplan_parties/__init__.py

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+"""GovOPlaN Parties module."""
+
+__version__ = "0.1.14"

src/govoplan_parties/backend/__init__.py

@@ -0,0 +1 @@
+"""Parties backend."""

src/govoplan_parties/backend/db/__init__.py

@@ -0,0 +1,3 @@
+from govoplan_parties.backend.db.models import ProcedurePartyRevision
+
+__all__ = ["ProcedurePartyRevision"]

src/govoplan_parties/backend/db/models.py

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+from __future__ import annotations
+
+from datetime import datetime
+from typing import Any
+import uuid
+
+from sqlalchemy import DateTime, ForeignKey, Index, JSON, String, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column
+
+from govoplan_core.db.base import Base, TimestampMixin
+
+
+def new_uuid() -> str:
+    return str(uuid.uuid4())
+
+
+class ProcedurePartyRevision(Base, TimestampMixin):
+    __tablename__ = "procedure_party_revisions"
+    __table_args__ = (
+        UniqueConstraint("tenant_id", "party_id", "revision", name="uq_procedure_party_revision"),
+        Index("ix_procedure_party_current", "tenant_id", "party_id", "superseded_at"),
+        Index("ix_procedure_party_resolution", "tenant_id", "procedure_kind", "procedure_owner_module", "procedure_id", "status", "valid_from", "valid_to"),
+    )
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_uuid)
+    tenant_id: Mapped[str] = mapped_column(String(36), nullable=False, index=True)
+    party_id: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
+    procedure_kind: Mapped[str] = mapped_column(String(30), nullable=False, index=True)
+    procedure_owner_module: Mapped[str] = mapped_column(String(80), nullable=False, index=True)
+    procedure_id: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
+    revision: Mapped[str] = mapped_column(String(120), nullable=False)
+    previous_revision_id: Mapped[str | None] = mapped_column(
+        ForeignKey("procedure_party_revisions.id", ondelete="RESTRICT"),
+        nullable=True,
+        index=True,
+    )
+    status: Mapped[str] = mapped_column(String(30), nullable=False, index=True)
+    valid_from: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    valid_to: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    recorded_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, index=True)
+    superseded_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
+    payload: Mapped[dict[str, Any]] = mapped_column(JSON, nullable=False)
+    created_by: Mapped[str | None] = mapped_column(String(255), nullable=True, index=True)
+
+
+__all__ = ["ProcedurePartyRevision"]

src/govoplan_parties/backend/manifest.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+from govoplan_core.core.institutional import CAPABILITY_PARTY_RESOLVER
+from govoplan_core.core.module_guards import drop_table_retirement_provider, persistent_table_uninstall_guard
+from govoplan_core.core.modules import CapabilityDocumentation, DocumentationLink, DocumentationTopic, MigrationSpec, ModuleContext, ModuleInterfaceProvider, ModuleManifest, PermissionDefinition, RoleTemplate
+from govoplan_core.core.provider_governance import declared_module_architecture
+from govoplan_core.db.base import Base
+from govoplan_parties.backend.db import models as party_models
+from govoplan_parties.backend.service import SqlPartyResolver
+
+
+MODULE_ID = "parties"
+MODULE_NAME = "Parties"
+MODULE_VERSION = "0.1.14"
+READ_SCOPE = "parties:procedure:read"
+WRITE_SCOPE = "parties:procedure:write"
+ADMIN_SCOPE = "parties:procedure:admin"
+
+
+def _permission(scope: str, label: str, description: str) -> PermissionDefinition:
+    module_id, resource, action = scope.split(":", 2)
+    return PermissionDefinition(scope=scope, label=label, description=description, category="Parties", level="tenant", module_id=module_id, resource=resource, action=action)
+
+
+def _router(_context: ModuleContext):
+    from govoplan_parties.backend.router import router
+
+    return router
+
+
+def _resolver(_context: ModuleContext) -> SqlPartyResolver:
+    return SqlPartyResolver()
+
+
+manifest = ModuleManifest(
+    id=MODULE_ID,
+    name=MODULE_NAME,
+    version=MODULE_VERSION,
+    optional_dependencies=("identity", "organizations", "addresses", "cases", "workflow_engine", "decisions", "policy", "audit"),
+    provides_interfaces=(ModuleInterfaceProvider(name="parties.procedure", version="0.1.0"), ModuleInterfaceProvider(name="parties.representation", version="0.1.0")),
+    permissions=(
+        _permission(READ_SCOPE, "View procedure parties", "View procedure-local roles, contact snapshots, and representation evidence."),
+        _permission(WRITE_SCOPE, "Manage procedure parties", "Create and revise procedure parties and revoke representation powers."),
+        _permission(ADMIN_SCOPE, "Administer procedure parties", "Administer party lifecycle, access, and recovery."),
+    ),
+    role_templates=(
+        RoleTemplate(slug="party_manager", name="Party manager", description="Manage procedure-local parties and representation.", permissions=(READ_SCOPE, WRITE_SCOPE)),
+        RoleTemplate(slug="party_reader", name="Party reader", description="Inspect procedure parties and authority evidence.", permissions=(READ_SCOPE,)),
+    ),
+    route_factory=_router,
+    capability_factories={CAPABILITY_PARTY_RESOLVER: _resolver},
+    capability_documentation={CAPABILITY_PARTY_RESOLVER: CapabilityDocumentation(label="Procedure Party resolver", summary="Returns effective, tenant-bound procedure parties and representation powers.", contract_version="0.1.0")},
+    migration_spec=MigrationSpec(
+        module_id=MODULE_ID,
+        metadata=Base.metadata,
+        script_location=str(Path(__file__).with_name("migrations") / "versions"),
+        retirement_supported=True,
+        retirement_provider=drop_table_retirement_provider(party_models.ProcedurePartyRevision, label="Parties"),
+        retirement_notes="Destructive retirement requires a database snapshot and removes procedure Party history.",
+    ),
+    uninstall_guard_providers=(persistent_table_uninstall_guard(party_models.ProcedurePartyRevision, label="Parties"),),
+    documentation=(
+        DocumentationTopic(
+            id="parties.procedure-and-representation",
+            title="Procedure parties and representation",
+            summary="Keep procedure roles and authority distinct from subject master data.",
+            body="Parties stores immutable procedure participation and explicit representation powers. Powers cannot disappear silently and delivery uses frozen contact snapshots.",
+            layer="configured",
+            documentation_types=("admin", "user"),
+            audience=("user", "operator", "module_admin", "auditor"),
+            links=(DocumentationLink(label="Parties domain and recovery", href="govoplan-parties/docs/PARTIES_DOMAIN.md", kind="repository"),),
+        ),
+    ),
+    architecture=declared_module_architecture(
+        layer="human_work_procedure",
+        kind="domain",
+        maturity="vertical_slice",
+        documentation_ref="docs/PARTIES_DOMAIN.md",
+        test_ref="tests/test_parties.py",
+        known_limits=("No dedicated WebUI is included; procedure modules present Party data in context.",),
+        supported_authority_modes=("native_authoritative",),
+        owned_concepts=("procedure party", "representation power", "procedure delivery authority"),
+        non_owned_concepts=("identity master", "organization master", "contact point", "case lifecycle"),
+        reference_packages=("product.service-to-decision",),
+        migration_docs=("docs/PARTIES_DOMAIN.md",),
+        recovery_docs=("docs/PARTIES_DOMAIN.md",),
+        security_docs=("docs/PARTIES_DOMAIN.md",),
+        operations_docs=("docs/PARTIES_DOMAIN.md",),
+    ),
+)
+
+
+def get_manifest() -> ModuleManifest:
+    return manifest

src/govoplan_parties/backend/migrations/__init__.py

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+"""Parties migrations."""

src/govoplan_parties/backend/migrations/versions/__init__.py

@@ -0,0 +1 @@
+"""Parties migration revisions."""

src/govoplan_parties/backend/migrations/versions/c0d3e4f5a6b7_v0114_parties_baseline.py

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+"""v0.1.14 Parties baseline.
+
+Revision ID: c0d3e4f5a6b7
+Revises: None
+"""
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = "c0d3e4f5a6b7"
+down_revision = None
+branch_labels = None
+depends_on = "4f2a9c8e7b6d"
+
+
+def upgrade() -> None:
+    op.create_table(
+        "procedure_party_revisions",
+        sa.Column("id", sa.String(length=36), nullable=False),
+        sa.Column("tenant_id", sa.String(length=36), nullable=False),
+        sa.Column("party_id", sa.String(length=255), nullable=False),
+        sa.Column("procedure_kind", sa.String(length=30), nullable=False),
+        sa.Column("procedure_owner_module", sa.String(length=80), nullable=False),
+        sa.Column("procedure_id", sa.String(length=255), nullable=False),
+        sa.Column("revision", sa.String(length=120), nullable=False),
+        sa.Column("previous_revision_id", sa.String(length=36), nullable=True),
+        sa.Column("status", sa.String(length=30), nullable=False),
+        sa.Column("valid_from", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("valid_to", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("recorded_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("superseded_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("payload", sa.JSON(), nullable=False),
+        sa.Column("created_by", sa.String(length=255), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False),
+        sa.ForeignKeyConstraint(["previous_revision_id"], ["procedure_party_revisions.id"], name=op.f("fk_procedure_party_revisions_previous_revision_id_procedure_party_revisions"), ondelete="RESTRICT"),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_procedure_party_revisions")),
+        sa.UniqueConstraint("tenant_id", "party_id", "revision", name="uq_procedure_party_revision"),
+    )
+    for column in ("tenant_id", "party_id", "procedure_kind", "procedure_owner_module", "procedure_id", "previous_revision_id", "status", "recorded_at", "superseded_at", "created_by"):
+        op.create_index(op.f(f"ix_procedure_party_revisions_{column}"), "procedure_party_revisions", [column], unique=False)
+    op.create_index("ix_procedure_party_current", "procedure_party_revisions", ["tenant_id", "party_id", "superseded_at"], unique=False)
+    op.create_index("ix_procedure_party_resolution", "procedure_party_revisions", ["tenant_id", "procedure_kind", "procedure_owner_module", "procedure_id", "status", "valid_from", "valid_to"], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_table("procedure_party_revisions")

src/govoplan_parties/backend/router.py

@@ -0,0 +1,90 @@
+from __future__ import annotations
+
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from govoplan_core.auth import ApiPrincipal, get_api_principal, has_scope
+from govoplan_core.core.institutional import InstitutionalContextError
+from govoplan_core.db.session import get_session
+from govoplan_parties.backend.manifest import READ_SCOPE, WRITE_SCOPE
+from govoplan_parties.backend.schemas import PartyListResponse, PartyResolutionRequest, PartyWriteRequest
+from govoplan_parties.backend.service import (
+    PartyStoreError,
+    SqlPartyResolver,
+    get_procedure_party,
+    party_from_mapping,
+    record_procedure_party,
+    reference_from_mapping,
+)
+
+
+router = APIRouter(prefix="/parties", tags=["parties"])
+
+
+def _require(principal: ApiPrincipal, scope: str) -> None:
+    if not has_scope(principal, scope):
+        raise HTTPException(status_code=403, detail=f"Missing scope: {scope}")
+
+
+def _error(exc: Exception) -> HTTPException:
+    message = str(exc)
+    return HTTPException(status_code=409 if "conflict" in message.lower() else 400, detail=message)
+
+
+@router.get("/{party_id}", response_model=dict[str, Any])
+def api_get_party(
+    party_id: str,
+    revision: str | None = None,
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> dict[str, Any]:
+    _require(principal, READ_SCOPE)
+    item = get_procedure_party(session, principal, party_id=party_id, revision=revision)
+    if item is None:
+        raise HTTPException(status_code=404, detail="Procedure Party not found")
+    return item.to_dict(include_inspection=True)
+
+
+@router.post("", response_model=dict[str, Any], status_code=status.HTTP_201_CREATED)
+def api_record_party(
+    payload: PartyWriteRequest,
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> dict[str, Any]:
+    _require(principal, WRITE_SCOPE)
+    try:
+        item = record_procedure_party(
+            session,
+            principal,
+            party=party_from_mapping(payload.party),
+            expected_revision=payload.expected_revision,
+        )
+        session.commit()
+    except (PartyStoreError, InstitutionalContextError) as exc:
+        session.rollback()
+        raise _error(exc) from exc
+    return item.to_dict(include_inspection=True)
+
+
+@router.post("/resolve", response_model=PartyListResponse)
+def api_resolve_parties(
+    payload: PartyResolutionRequest,
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> PartyListResponse:
+    _require(principal, READ_SCOPE)
+    try:
+        items = SqlPartyResolver().list_procedure_parties(
+            session,
+            principal,
+            procedure_ref=reference_from_mapping(payload.procedure_ref),
+            effective_at=payload.effective_at,
+        )
+    except (PartyStoreError, InstitutionalContextError) as exc:
+        raise _error(exc) from exc
+    return PartyListResponse(parties=[item.to_dict(include_inspection=True) for item in items])
+
+
+__all__ = ["router"]

src/govoplan_parties/backend/schemas.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from datetime import datetime
+from typing import Any
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class PartyWriteRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    party: dict[str, Any]
+    expected_revision: str | None = Field(default=None, max_length=120)
+
+
+class PartyResolutionRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    procedure_ref: dict[str, Any]
+    effective_at: datetime | None = None
+
+
+class PartyListResponse(BaseModel):
+    parties: list[dict[str, Any]]
+
+
+__all__ = ["PartyListResponse", "PartyResolutionRequest", "PartyWriteRequest"]

src/govoplan_parties/backend/service.py

@@ -0,0 +1,323 @@
+from __future__ import annotations
+
+from datetime import UTC, datetime
+from typing import Any, Mapping, Sequence
+
+from sqlalchemy import or_
+from sqlalchemy.orm import Session
+
+from govoplan_core.core.institutional import (
+    InstitutionalContextError,
+    InstitutionalReference,
+    PartyRepresentation,
+    ProcedureParty,
+    TemporalRevision,
+    revise_procedure_party,
+    revoke_party_representation,
+)
+from govoplan_parties.backend.db.models import ProcedurePartyRevision
+
+
+MAX_PARTY_CANDIDATES = 1_000
+
+
+class PartyStoreError(ValueError):
+    pass
+
+
+def record_procedure_party(
+    session: Session,
+    principal: object,
+    *,
+    party: ProcedureParty,
+    expected_revision: str | None = None,
+) -> ProcedureParty:
+    tenant_id = _principal_tenant(principal)
+    _validate_party(party, tenant_id=tenant_id)
+    payload = party.to_dict(include_inspection=True)
+    replay = (
+        session.query(ProcedurePartyRevision)
+        .filter(
+            ProcedurePartyRevision.tenant_id == tenant_id,
+            ProcedurePartyRevision.party_id == party.reference.object_id,
+            ProcedurePartyRevision.revision == party.temporal.revision,
+        )
+        .one_or_none()
+    )
+    if replay is not None:
+        if replay.payload != payload:
+            raise PartyStoreError(
+                "A different Party payload already uses this revision."
+            )
+        return _party_from_row(replay)
+
+    current_row = _current_row(
+        session,
+        tenant_id=tenant_id,
+        party_id=party.reference.object_id,
+        lock=True,
+    )
+    _validate_temporal(party.temporal)
+    if current_row is None:
+        if expected_revision is not None:
+            raise PartyStoreError("Party revision conflict: no current revision exists.")
+        _validate_new_representations(party.representations)
+    else:
+        current = _party_from_row(current_row)
+        if not _same_reference_identity(current.procedure_ref, party.procedure_ref):
+            raise PartyStoreError("A Party cannot move to another procedure.")
+        try:
+            revised = revise_procedure_party(
+                current,
+                expected_revision=expected_revision or "",
+                temporal=party.temporal,
+                status=party.status,
+                role=party.role,
+                subject=party.subject,
+                preferred_channels=party.preferred_channels,
+                permitted_channels=party.permitted_channels,
+                delivery_recipient=party.delivery_recipient,
+                representations=party.representations,
+                contact_snapshot_refs=party.contact_snapshot_refs,
+                evidence=party.evidence,
+            )
+        except InstitutionalContextError as exc:
+            raise PartyStoreError(str(exc)) from exc
+        if revised != party:
+            raise PartyStoreError(
+                "Party identity and immutable procedure reference must follow the lifecycle revision."
+            )
+        _validate_representation_changes(current.representations, party.representations)
+        current_row.superseded_at = party.temporal.recorded_at
+
+    row = ProcedurePartyRevision(
+        tenant_id=tenant_id,
+        party_id=party.reference.object_id,
+        procedure_kind=party.procedure_ref.kind,
+        procedure_owner_module=party.procedure_ref.owner_module,
+        procedure_id=party.procedure_ref.object_id,
+        revision=party.temporal.revision,
+        previous_revision_id=current_row.id if current_row is not None else None,
+        status=party.status,
+        valid_from=party.temporal.valid_from,
+        valid_to=party.temporal.valid_to,
+        recorded_at=_recorded_at(party.temporal),
+        payload=payload,
+        created_by=_principal_actor(principal),
+    )
+    session.add(row)
+    session.flush()
+    return _party_from_row(row)
+
+
+def get_procedure_party(
+    session: Session,
+    principal: object,
+    *,
+    party_id: str,
+    revision: str | None = None,
+) -> ProcedureParty | None:
+    tenant_id = _principal_tenant(principal)
+    query = session.query(ProcedurePartyRevision).filter(
+        ProcedurePartyRevision.tenant_id == tenant_id,
+        ProcedurePartyRevision.party_id == party_id,
+    )
+    if revision is None:
+        query = query.filter(ProcedurePartyRevision.superseded_at.is_(None))
+    else:
+        query = query.filter(ProcedurePartyRevision.revision == revision)
+    row = query.order_by(ProcedurePartyRevision.recorded_at.desc()).first()
+    return _party_from_row(row) if row is not None else None
+
+
+class SqlPartyResolver:
+    def list_procedure_parties(
+        self,
+        session: object,
+        principal: object,
+        *,
+        procedure_ref: InstitutionalReference,
+        effective_at: datetime | None = None,
+    ) -> Sequence[ProcedureParty]:
+        tenant_id = _principal_tenant(principal)
+        if procedure_ref.tenant_id != tenant_id or procedure_ref.kind not in {"case", "workflow", "decision"}:
+            raise InstitutionalContextError(
+                "Party resolution requires a same-tenant case, workflow, or decision reference."
+            )
+        typed_session = _session(session)
+        query = typed_session.query(ProcedurePartyRevision).filter(
+            ProcedurePartyRevision.tenant_id == tenant_id,
+            ProcedurePartyRevision.procedure_kind == procedure_ref.kind,
+            ProcedurePartyRevision.procedure_owner_module == procedure_ref.owner_module,
+            ProcedurePartyRevision.procedure_id == procedure_ref.object_id,
+        )
+        if effective_at is None:
+            query = query.filter(ProcedurePartyRevision.superseded_at.is_(None))
+        else:
+            query = query.filter(
+                or_(ProcedurePartyRevision.valid_from.is_(None), ProcedurePartyRevision.valid_from <= effective_at),
+                or_(ProcedurePartyRevision.valid_to.is_(None), ProcedurePartyRevision.valid_to > effective_at),
+            )
+        rows = query.order_by(
+            ProcedurePartyRevision.party_id.asc(),
+            ProcedurePartyRevision.recorded_at.desc(),
+        ).limit(MAX_PARTY_CANDIDATES + 1).all()
+        if len(rows) > MAX_PARTY_CANDIDATES:
+            raise InstitutionalContextError("Party resolution candidate bound was exceeded.")
+        latest: dict[str, ProcedureParty] = {}
+        for row in rows:
+            latest.setdefault(row.party_id, _party_from_row(row))
+        return tuple(latest.values())
+
+
+def party_from_mapping(value: Mapping[str, object]) -> ProcedureParty:
+    try:
+        return ProcedureParty.from_mapping(value)
+    except InstitutionalContextError as exc:
+        raise PartyStoreError(str(exc)) from exc
+
+
+def reference_from_mapping(value: Mapping[str, object]) -> InstitutionalReference:
+    try:
+        return InstitutionalReference.from_mapping(value)
+    except InstitutionalContextError as exc:
+        raise PartyStoreError(str(exc)) from exc
+
+
+def _validate_representation_changes(
+    current: Sequence[PartyRepresentation],
+    revised: Sequence[PartyRepresentation],
+) -> None:
+    next_by_key = {_representation_key(item): item for item in revised}
+    if len(next_by_key) != len(revised):
+        raise PartyStoreError("Party representations cannot contain duplicate powers.")
+    current_keys = {_representation_key(item) for item in current}
+    if not current_keys.issubset(next_by_key):
+        raise PartyStoreError(
+            "Representation powers cannot be removed; revoke them explicitly."
+        )
+    for previous in current:
+        next_item = next_by_key[_representation_key(previous)]
+        if next_item == previous:
+            continue
+        if previous.revoked_at is not None:
+            raise PartyStoreError("A revoked representation power is immutable.")
+        if next_item.revoked_at is None:
+            raise PartyStoreError(
+                "An existing representation power can only change through revocation."
+            )
+        try:
+            expected = revoke_party_representation(
+                previous,
+                expected_revision=previous.temporal.revision,
+                temporal=next_item.temporal,
+                revoked_at=next_item.revoked_at,
+                evidence=next_item.evidence,
+            )
+        except InstitutionalContextError as exc:
+            raise PartyStoreError(str(exc)) from exc
+        if expected != next_item:
+            raise PartyStoreError(
+                "Representation revocation cannot rewrite parties, power, or permitted actions."
+            )
+    _validate_new_representations(
+        tuple(item for item in revised if _representation_key(item) not in current_keys)
+    )
+
+
+def _validate_new_representations(items: Sequence[PartyRepresentation]) -> None:
+    seen: set[tuple[str, str, str]] = set()
+    for item in items:
+        key = _representation_key(item)
+        if key in seen:
+            raise PartyStoreError("Party representations cannot contain duplicate powers.")
+        seen.add(key)
+        _validate_temporal(item.temporal)
+        if item.revoked_at is not None:
+            raise PartyStoreError("A new representation cannot already be revoked.")
+
+
+def _representation_key(item: PartyRepresentation) -> tuple[str, str, str]:
+    return (
+        item.power_ref,
+        item.representative_party_ref.object_id,
+        item.represented_party_ref.object_id,
+    )
+
+
+def _current_row(session: Session, *, tenant_id: str, party_id: str, lock: bool) -> ProcedurePartyRevision | None:
+    query = session.query(ProcedurePartyRevision).filter(
+        ProcedurePartyRevision.tenant_id == tenant_id,
+        ProcedurePartyRevision.party_id == party_id,
+        ProcedurePartyRevision.superseded_at.is_(None),
+    )
+    if lock:
+        query = query.with_for_update()
+    return query.one_or_none()
+
+
+def _party_from_row(row: ProcedurePartyRevision) -> ProcedureParty:
+    payload: dict[str, Any] = dict(row.payload)
+    temporal = dict(payload.get("temporal") or {})
+    temporal["superseded_at"] = _datetime_text(row.superseded_at)
+    payload["temporal"] = temporal
+    return ProcedureParty.from_mapping(payload)
+
+
+def _validate_party(party: ProcedureParty, *, tenant_id: str) -> None:
+    if party.reference.owner_module != "parties":
+        raise PartyStoreError("Procedure Parties must be owned by Parties.")
+    if party.reference.tenant_id != tenant_id:
+        raise PartyStoreError("Procedure Parties cannot cross tenants.")
+    if party.reference.version != party.temporal.revision:
+        raise PartyStoreError("Party reference version must match its temporal revision.")
+    if party.temporal.superseded_at is not None:
+        raise PartyStoreError("Clients cannot set Party superseded_at.")
+
+
+def _validate_temporal(temporal: TemporalRevision) -> None:
+    _recorded_at(temporal)
+    if not str(temporal.change_reason or "").strip():
+        raise PartyStoreError("A Party revision requires recorded_at and change_reason.")
+
+
+def _recorded_at(temporal: TemporalRevision) -> datetime:
+    if temporal.recorded_at is None:
+        raise PartyStoreError("A Party revision requires recorded_at.")
+    return temporal.recorded_at
+
+
+def _same_reference_identity(left: InstitutionalReference, right: InstitutionalReference) -> bool:
+    return (left.kind, left.owner_module, left.object_id, left.tenant_id) == (right.kind, right.owner_module, right.object_id, right.tenant_id)
+
+
+def _principal_tenant(principal: object) -> str:
+    tenant_id = str(getattr(principal, "tenant_id", "") or "").strip()
+    if not tenant_id:
+        raise InstitutionalContextError("Party operations require a tenant-bound principal.")
+    return tenant_id
+
+
+def _principal_actor(principal: object) -> str | None:
+    for name in ("account_id", "identity_id", "membership_id"):
+        value = str(getattr(principal, name, "") or "").strip()
+        if value:
+            return value
+    return None
+
+
+def _session(value: object) -> Session:
+    if not hasattr(value, "query"):
+        raise InstitutionalContextError("Party resolver requires a database session.")
+    return value  # type: ignore[return-value]
+
+
+def _datetime_text(value: datetime | None) -> str | None:
+    if value is None:
+        return None
+    if value.tzinfo is None:
+        value = value.replace(tzinfo=UTC)
+    return value.isoformat()
+
+
+__all__ = ["PartyStoreError", "SqlPartyResolver", "get_procedure_party", "party_from_mapping", "record_procedure_party", "reference_from_mapping"]

src/govoplan_parties/py.typed

@@ -0,0 +1 @@
+