feat: implement formal decision registry

.gitea/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "Bug"
+about: "Report a reproducible defect, regression, or incorrect behavior"
+title: "[Bug] "
+labels:
+  - type/bug
+  - status/triage
+  - module/core
+---
+
+## Scope
+
+- Repository:
+- Area/module:
+- Affected version or commit:
+
+## Behavior
+
+Expected:
+
+Actual:
+
+## Reproduction
+
+1.
+2.
+3.
+
+## Evidence
+
+Logs, screenshots, traces, or failing test output:
+
+## Verification Target
+
+Command or workflow that should pass when fixed:

.gitea/ISSUE_TEMPLATE/config.yaml

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+blank_issues_enabled: false

.gitea/ISSUE_TEMPLATE/docs_workflow.md

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+---
+name: "Docs / workflow"
+about: "Request documentation, process, or developer workflow changes"
+title: "[Docs] "
+labels:
+  - type/docs
+  - status/triage
+  - module/core
+  - area/docs
+---
+
+## Scope
+
+- Repository:
+- Document or workflow:
+
+## Current State
+
+What is missing, unclear, duplicated, or stale?
+
+## Desired State
+
+What should the docs or workflow make clear?
+
+## Verification Target
+
+How should this be checked?

.gitea/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "Feature"
+about: "Propose new user-visible behavior or platform capability"
+title: "[Feature] "
+labels:
+  - type/feature
+  - status/triage
+  - module/core
+---
+
+## Problem
+
+What user, operator, or developer problem should this solve?
+
+## Proposed Capability
+
+What should exist when this is done?
+
+## Ownership
+
+- Owning repository:
+- Related module repositories:
+- Extension point or integration boundary:
+
+## Acceptance Criteria
+
+- [ ]
+- [ ]
+
+## Verification Target
+
+Command, scenario, or UI flow that should prove completion:

.gitea/ISSUE_TEMPLATE/task.md

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+---
+name: "Task"
+about: "Track implementation, maintenance, or migration work"
+title: "[Task] "
+labels:
+  - type/task
+  - status/triage
+  - module/core
+---
+
+## Objective
+
+What needs to be completed?
+
+## Scope
+
+- Owning repository:
+- In-scope:
+- Out-of-scope:
+
+## Checklist
+
+- [ ]
+- [ ]
+
+## Verification Target
+
+Command or manual check:

.gitea/ISSUE_TEMPLATE/tech_debt.md

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+---
+name: "Tech debt"
+about: "Track cleanup, refactoring, risk reduction, or deferred engineering work"
+title: "[Debt] "
+labels:
+  - type/debt
+  - status/triage
+  - module/core
+---
+
+## Current Cost
+
+What does this make harder, riskier, slower, or more fragile?
+
+## Desired Shape
+
+What should the code, tests, or architecture look like afterwards?
+
+## Constraints
+
+What behavior, compatibility, or module boundary must be preserved?
+
+## Verification Target
+
+Focused checks that should pass:

.gitea/PULL_REQUEST_TEMPLATE.md

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+## Issue
+
+Closes #
+
+## Summary
+
+-
+
+## Verification
+
+-
+
+## Notes
+
+Follow-up issues:

.gitignore

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+# ---> Node
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
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+# Local WebUI test/build scratch directories
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+webui/.component-test-build/
+webui/.file-drop-test-build/
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+webui/.import-test-build/
+
+# Security audit reports
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+
+# ---> Python
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
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+.tox/
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+.cache
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+*.cover
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+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
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+
+# Django stuff:
+*.log
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+db.sqlite3-journal
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+instance/
+.webassets-cache
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+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# UV
+#   Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#uv.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/latest/usage/project/#working-with-version-control
+.pdm.toml
+.pdm-python
+.pdm-build/
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+# Ruff stuff:
+.ruff_cache/
+
+# PyPI configuration file
+.pypirc
+
+# ---> VisualStudioCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+*.db
+
+# GovOPlaN local runtime state
+runtime/
+
+# GovOPlaN WebUI test output
+webui/.module-test-build/
+webui/.component-test-build/

README.md

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+# GovOPlaN Decisions
+
+<!-- govoplan-repository-type:start -->
+**Repository type:** module (domain).
+<!-- govoplan-repository-type:end -->
+
+`govoplan-decisions` owns reconstructable formal institutional outcomes:
+authority context, exact mandate and rule versions, facts and evidence,
+reasoning, operative result, conditions, requested and observed effects,
+delivery/publication, remedies, reviews, corrections, revocations, and
+supersession.
+
+Approvals owns review gates, Committee owns deliberation and voting, Workflow
+owns coordination, and domain modules own their effects. They record formal
+outcomes through `decisions.registry` without reading Decisions tables.
+
+See [docs/DECISIONS_DOMAIN.md](docs/DECISIONS_DOMAIN.md).

docs/DECISIONS_DOMAIN.md

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+# Formal Decisions Domain
+
+## Ownership And Reconstruction
+
+Decisions stores immutable formal-outcome revisions. Each outcome retains the
+responsible human or service actor, represented function/party, effective
+Mandate and jurisdiction, approvals, fact evidence, legal bases, rule versions,
+reasoning, operative result, requested and observed effects, delivery,
+publication, remedy, and review references.
+
+The ordinary read projection withholds protected reasoning and operative
+content. A separate sensitive-read permission is required to disclose it.
+
+## Lifecycle
+
+Writes use the shared Decision transition matrix and optimistic concurrency.
+Correction and revocation create linked revisions; they never edit the previous
+outcome in place. Replaying an identical tenant/decision/revision is idempotent,
+while a different payload under that revision fails.
+
+## Recovery
+
+Database restore is the persistence recovery unit. Requested effects remain
+separate from observed effects and keep audit/evidence references, allowing an
+operator to reconcile an outcome whose external effect was uncertain. Domain
+effect providers retain their own compensation and recovery behavior.

pyproject.toml

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+[build-system]
+requires = ["setuptools>=69", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "govoplan-decisions"
+version = "0.1.14"
+description = "Formal institutional decision lifecycle and reconstruction for GovOPlaN."
+readme = "README.md"
+requires-python = ">=3.12"
+authors = [{ name = "GovOPlaN" }]
+dependencies = ["govoplan-core>=0.1.14"]
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.setuptools.package-data]
+govoplan_decisions = ["py.typed"]
+
+[project.entry-points."govoplan.modules"]
+"decisions" = "govoplan_decisions.backend.manifest:get_manifest"

src/govoplan_decisions/__init__.py

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

src/govoplan_decisions/backend/__init__.py

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+"""Decisions backend."""

src/govoplan_decisions/backend/db/__init__.py

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+from govoplan_decisions.backend.db.models import FormalDecisionRevision
+
+__all__ = ["FormalDecisionRevision"]

src/govoplan_decisions/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 FormalDecisionRevision(Base, TimestampMixin):
+    __tablename__ = "formal_decision_revisions"
+    __table_args__ = (
+        UniqueConstraint("tenant_id", "decision_id", "revision", name="uq_formal_decision_revision"),
+        Index("ix_formal_decision_current", "tenant_id", "decision_id", "superseded_at"),
+        Index("ix_formal_decision_catalogue", "tenant_id", "state", "decision_type", "recorded_at"),
+    )
+
+    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)
+    decision_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("formal_decision_revisions.id", ondelete="RESTRICT"),
+        nullable=True,
+        index=True,
+    )
+    decision_type: Mapped[str] = mapped_column(String(120), nullable=False, index=True)
+    state: 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__ = ["FormalDecisionRevision"]

src/govoplan_decisions/backend/manifest.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+from govoplan_core.core.institutional import CAPABILITY_DECISION_REGISTRY
+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_decisions.backend.db import models as decision_models
+from govoplan_decisions.backend.service import SqlDecisionRegistry
+
+
+MODULE_ID = "decisions"
+MODULE_NAME = "Decisions"
+MODULE_VERSION = "0.1.14"
+READ_SCOPE = "decisions:decision:read"
+SENSITIVE_READ_SCOPE = "decisions:decision:read_sensitive"
+WRITE_SCOPE = "decisions:decision:write"
+ADMIN_SCOPE = "decisions:decision: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="Decisions", level="tenant", module_id=module_id, resource=resource, action=action)
+
+
+def _router(_context: ModuleContext):
+    from govoplan_decisions.backend.router import router
+
+    return router
+
+
+def _registry(_context: ModuleContext) -> SqlDecisionRegistry:
+    return SqlDecisionRegistry()
+
+
+manifest = ModuleManifest(
+    id=MODULE_ID,
+    name=MODULE_NAME,
+    version=MODULE_VERSION,
+    optional_dependencies=("mandates", "approvals", "committee", "cases", "audit", "policy", "records", "files", "postbox", "mail"),
+    provides_interfaces=(ModuleInterfaceProvider(name="decisions.formal_outcome", version="0.1.0"), ModuleInterfaceProvider(name="decisions.reconstruction", version="0.1.0")),
+    permissions=(
+        _permission(READ_SCOPE, "View Decision metadata", "View formal Decision metadata and evidence references."),
+        _permission(SENSITIVE_READ_SCOPE, "View protected Decisions", "View protected reasoning, operative results, and conditions."),
+        _permission(WRITE_SCOPE, "Record Decisions", "Record governed formal outcomes and lifecycle revisions."),
+        _permission(ADMIN_SCOPE, "Administer Decisions", "Administer Decision access, lifecycle, and recovery."),
+    ),
+    role_templates=(
+        RoleTemplate(slug="decision_officer", name="Decision officer", description="Record and inspect formal Decisions.", permissions=(READ_SCOPE, SENSITIVE_READ_SCOPE, WRITE_SCOPE)),
+        RoleTemplate(slug="decision_auditor", name="Decision auditor", description="Reconstruct protected formal outcomes.", permissions=(READ_SCOPE, SENSITIVE_READ_SCOPE)),
+    ),
+    route_factory=_router,
+    capability_factories={CAPABILITY_DECISION_REGISTRY: _registry},
+    capability_documentation={CAPABILITY_DECISION_REGISTRY: CapabilityDocumentation(label="Formal Decision registry", summary="Records and resolves immutable, reconstructable formal outcomes.", 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(decision_models.FormalDecisionRevision, label="Decisions"),
+        retirement_notes="Destructive retirement requires a database snapshot and removes formal Decision history.",
+    ),
+    uninstall_guard_providers=(persistent_table_uninstall_guard(decision_models.FormalDecisionRevision, label="Decisions"),),
+    documentation=(
+        DocumentationTopic(
+            id="decisions.formal-outcome",
+            title="Formal institutional Decisions",
+            summary="Reconstruct authority, evidence, reasoning, outcome, effects, and review history.",
+            body="Decisions preserves immutable formal outcomes. Corrections and revocations create linked revisions; requested and observed effects remain distinct for reconciliation.",
+            layer="configured",
+            documentation_types=("admin", "user"),
+            audience=("user", "operator", "module_admin", "auditor"),
+            links=(DocumentationLink(label="Decisions domain and recovery", href="govoplan-decisions/docs/DECISIONS_DOMAIN.md", kind="repository"),),
+        ),
+    ),
+    architecture=declared_module_architecture(
+        layer="governance_accountability",
+        kind="domain",
+        maturity="vertical_slice",
+        documentation_ref="docs/DECISIONS_DOMAIN.md",
+        test_ref="tests/test_decisions.py",
+        known_limits=("No dedicated Decision WebUI is included; consuming procedure modules present outcomes in context.",),
+        supported_authority_modes=("native_authoritative",),
+        owned_concepts=("formal decision", "decision correction", "decision effect observation"),
+        non_owned_concepts=("approval gate", "committee deliberation", "effect execution", "record binary"),
+        reference_packages=("product.service-to-decision",),
+        migration_docs=("docs/DECISIONS_DOMAIN.md",),
+        recovery_docs=("docs/DECISIONS_DOMAIN.md",),
+        security_docs=("docs/DECISIONS_DOMAIN.md",),
+        operations_docs=("docs/DECISIONS_DOMAIN.md",),
+    ),
+)
+
+
+def get_manifest() -> ModuleManifest:
+    return manifest

src/govoplan_decisions/backend/migrations/__init__.py

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+"""Decisions migrations."""

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

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

src/govoplan_decisions/backend/migrations/versions/d1e4f5a6b7c8_v0114_decisions_baseline.py

@@ -0,0 +1,47 @@
+"""v0.1.14 Decisions baseline.
+
+Revision ID: d1e4f5a6b7c8
+Revises: None
+"""
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = "d1e4f5a6b7c8"
+down_revision = None
+branch_labels = None
+depends_on = "4f2a9c8e7b6d"
+
+
+def upgrade() -> None:
+    op.create_table(
+        "formal_decision_revisions",
+        sa.Column("id", sa.String(length=36), nullable=False),
+        sa.Column("tenant_id", sa.String(length=36), nullable=False),
+        sa.Column("decision_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("decision_type", sa.String(length=120), nullable=False),
+        sa.Column("state", 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"], ["formal_decision_revisions.id"], name=op.f("fk_formal_decision_revisions_previous_revision_id_formal_decision_revisions"), ondelete="RESTRICT"),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_formal_decision_revisions")),
+        sa.UniqueConstraint("tenant_id", "decision_id", "revision", name="uq_formal_decision_revision"),
+    )
+    for column in ("tenant_id", "decision_id", "previous_revision_id", "decision_type", "state", "recorded_at", "superseded_at", "created_by"):
+        op.create_index(op.f(f"ix_formal_decision_revisions_{column}"), "formal_decision_revisions", [column], unique=False)
+    op.create_index("ix_formal_decision_current", "formal_decision_revisions", ["tenant_id", "decision_id", "superseded_at"], unique=False)
+    op.create_index("ix_formal_decision_catalogue", "formal_decision_revisions", ["tenant_id", "state", "decision_type", "recorded_at"], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_table("formal_decision_revisions")

src/govoplan_decisions/backend/router.py

@@ -0,0 +1,91 @@
+from __future__ import annotations
+
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, Query, status
+from sqlalchemy.orm import Session
+
+from govoplan_core.auth import ApiPrincipal, get_api_principal, has_scope
+from govoplan_core.core.institutional import InstitutionalContextError, InstitutionalReference
+from govoplan_core.db.session import get_session
+from govoplan_decisions.backend.manifest import READ_SCOPE, SENSITIVE_READ_SCOPE, WRITE_SCOPE
+from govoplan_decisions.backend.schemas import DecisionListResponse, DecisionWriteRequest
+from govoplan_decisions.backend.service import DecisionStoreError, SqlDecisionRegistry, decision_from_mapping, list_decisions
+
+
+router = APIRouter(prefix="/decisions", tags=["decisions"])
+
+
+def _require(principal: ApiPrincipal, scope: str) -> None:
+    if not has_scope(principal, scope):
+        raise HTTPException(status_code=403, detail=f"Missing scope: {scope}")
+
+
+def _protected(principal: ApiPrincipal, requested: bool) -> bool:
+    if requested:
+        _require(principal, SENSITIVE_READ_SCOPE)
+    return requested
+
+
+def _error(exc: Exception) -> HTTPException:
+    message = str(exc)
+    return HTTPException(status_code=409 if "conflict" in message.lower() else 400, detail=message)
+
+
+@router.get("", response_model=DecisionListResponse)
+def api_list_decisions(
+    decision_state: str | None = Query(default=None, alias="state"),
+    decision_type: str | None = None,
+    include_protected: bool = False,
+    limit: int = Query(default=100, ge=1, le=200),
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> DecisionListResponse:
+    _require(principal, READ_SCOPE)
+    disclose = _protected(principal, include_protected)
+    items = list_decisions(session, principal, state=decision_state, decision_type=decision_type, limit=limit)
+    return DecisionListResponse(decisions=[item.to_dict(include_protected=disclose) for item in items])
+
+
+@router.get("/{decision_id}", response_model=dict[str, Any])
+def api_get_decision(
+    decision_id: str,
+    revision: str | None = None,
+    include_protected: bool = False,
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> dict[str, Any]:
+    _require(principal, READ_SCOPE)
+    disclose = _protected(principal, include_protected)
+    item = SqlDecisionRegistry().get_decision(
+        session,
+        principal,
+        reference=InstitutionalReference(kind="decision", owner_module="decisions", object_id=decision_id, tenant_id=principal.tenant_id, version=revision),
+    )
+    if item is None:
+        raise HTTPException(status_code=404, detail="Formal Decision not found")
+    return item.to_dict(include_protected=disclose)
+
+
+@router.post("", response_model=dict[str, Any], status_code=status.HTTP_201_CREATED)
+def api_record_decision(
+    payload: DecisionWriteRequest,
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> dict[str, Any]:
+    _require(principal, WRITE_SCOPE)
+    try:
+        item = SqlDecisionRegistry().record_decision(
+            session,
+            principal,
+            decision=decision_from_mapping(payload.decision),
+            expected_revision=payload.expected_revision,
+        )
+        session.commit()
+    except (DecisionStoreError, InstitutionalContextError) as exc:
+        session.rollback()
+        raise _error(exc) from exc
+    return item.to_dict(include_protected=True)
+
+
+__all__ = ["router"]

src/govoplan_decisions/backend/schemas.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+from typing import Any
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class DecisionWriteRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    decision: dict[str, Any]
+    expected_revision: str | None = Field(default=None, max_length=120)
+
+
+class DecisionListResponse(BaseModel):
+    decisions: list[dict[str, Any]]
+
+
+__all__ = ["DecisionListResponse", "DecisionWriteRequest"]

src/govoplan_decisions/backend/service.py

@@ -0,0 +1,246 @@
+from __future__ import annotations
+
+from datetime import UTC, datetime
+from typing import Any, Mapping
+
+from sqlalchemy.orm import Session
+
+from govoplan_core.core.institutional import (
+    FormalDecision,
+    InstitutionalContextError,
+    InstitutionalReference,
+    TemporalRevision,
+    revise_formal_decision,
+)
+from govoplan_decisions.backend.db.models import FormalDecisionRevision
+
+
+class DecisionStoreError(ValueError):
+    pass
+
+
+class SqlDecisionRegistry:
+    def get_decision(
+        self,
+        session: object,
+        principal: object,
+        *,
+        reference: InstitutionalReference,
+    ) -> FormalDecision | None:
+        tenant_id = _principal_tenant(principal)
+        if reference.kind != "decision" or reference.tenant_id != tenant_id:
+            raise InstitutionalContextError(
+                "Decision lookup requires a same-tenant Decision reference."
+            )
+        query = _session(session).query(FormalDecisionRevision).filter(
+            FormalDecisionRevision.tenant_id == tenant_id,
+            FormalDecisionRevision.decision_id == reference.object_id,
+        )
+        if reference.version is None:
+            query = query.filter(FormalDecisionRevision.superseded_at.is_(None))
+        else:
+            query = query.filter(FormalDecisionRevision.revision == reference.version)
+        row = query.order_by(FormalDecisionRevision.recorded_at.desc()).first()
+        return _decision_from_row(row) if row is not None else None
+
+    def record_decision(
+        self,
+        session: object,
+        principal: object,
+        *,
+        decision: FormalDecision,
+        expected_revision: str | None = None,
+    ) -> FormalDecision:
+        typed_session = _session(session)
+        tenant_id = _principal_tenant(principal)
+        _validate_decision(decision, tenant_id=tenant_id)
+        payload = decision.to_dict(include_protected=True)
+        replay = (
+            typed_session.query(FormalDecisionRevision)
+            .filter(
+                FormalDecisionRevision.tenant_id == tenant_id,
+                FormalDecisionRevision.decision_id == decision.reference.object_id,
+                FormalDecisionRevision.revision == decision.temporal.revision,
+            )
+            .one_or_none()
+        )
+        if replay is not None:
+            if replay.payload != payload:
+                raise DecisionStoreError(
+                    "A different Decision payload already uses this revision."
+                )
+            return _decision_from_row(replay)
+
+        current_row = _current_row(
+            typed_session,
+            tenant_id=tenant_id,
+            decision_id=decision.reference.object_id,
+            lock=True,
+        )
+        _validate_temporal(decision.temporal)
+        if current_row is None:
+            if expected_revision is not None:
+                raise DecisionStoreError(
+                    "Decision revision conflict: no current revision exists."
+                )
+        else:
+            current = _decision_from_row(current_row)
+            try:
+                revised = revise_formal_decision(
+                    current,
+                    expected_revision=expected_revision or "",
+                    temporal=decision.temporal,
+                    state=decision.state,
+                    operative_result=decision.operative_result,
+                    reasoning=decision.reasoning,
+                    conditions=decision.conditions,
+                    requested_effects=decision.requested_effects,
+                    observed_effects=decision.observed_effects,
+                    delivery_refs=decision.delivery_refs,
+                    publication_refs=decision.publication_refs,
+                    remedy_refs=decision.remedy_refs,
+                    review_refs=decision.review_refs,
+                    assurance_level=decision.assurance_level,
+                    automation_preparation_refs=decision.automation_preparation_refs,
+                )
+            except InstitutionalContextError as exc:
+                raise DecisionStoreError(str(exc)) from exc
+            if revised != decision:
+                raise DecisionStoreError(
+                    "Decision authority, subjects, facts, and legal bases cannot be rewritten by a lifecycle revision."
+                )
+            current_row.superseded_at = decision.temporal.recorded_at
+
+        row = FormalDecisionRevision(
+            tenant_id=tenant_id,
+            decision_id=decision.reference.object_id,
+            revision=decision.temporal.revision,
+            previous_revision_id=current_row.id if current_row is not None else None,
+            decision_type=decision.decision_type,
+            state=decision.state,
+            valid_from=decision.temporal.valid_from,
+            valid_to=decision.temporal.valid_to,
+            recorded_at=_recorded_at(decision.temporal),
+            payload=payload,
+            created_by=_principal_actor(principal),
+        )
+        typed_session.add(row)
+        typed_session.flush()
+        return _decision_from_row(row)
+
+
+def list_decisions(
+    session: Session,
+    principal: object,
+    *,
+    state: str | None = None,
+    decision_type: str | None = None,
+    limit: int = 100,
+) -> tuple[FormalDecision, ...]:
+    tenant_id = _principal_tenant(principal)
+    if not 1 <= limit <= 200:
+        raise DecisionStoreError("Decision list limit must be between 1 and 200.")
+    query = session.query(FormalDecisionRevision).filter(
+        FormalDecisionRevision.tenant_id == tenant_id,
+        FormalDecisionRevision.superseded_at.is_(None),
+    )
+    if state:
+        query = query.filter(FormalDecisionRevision.state == state)
+    if decision_type:
+        query = query.filter(FormalDecisionRevision.decision_type == decision_type)
+    rows = query.order_by(FormalDecisionRevision.recorded_at.desc()).limit(limit).all()
+    return tuple(_decision_from_row(row) for row in rows)
+
+
+def decision_from_mapping(value: Mapping[str, object]) -> FormalDecision:
+    try:
+        return FormalDecision.from_mapping(value)
+    except InstitutionalContextError as exc:
+        raise DecisionStoreError(str(exc)) from exc
+
+
+def reference_from_mapping(value: Mapping[str, object]) -> InstitutionalReference:
+    try:
+        return InstitutionalReference.from_mapping(value)
+    except InstitutionalContextError as exc:
+        raise DecisionStoreError(str(exc)) from exc
+
+
+def _current_row(session: Session, *, tenant_id: str, decision_id: str, lock: bool) -> FormalDecisionRevision | None:
+    query = session.query(FormalDecisionRevision).filter(
+        FormalDecisionRevision.tenant_id == tenant_id,
+        FormalDecisionRevision.decision_id == decision_id,
+        FormalDecisionRevision.superseded_at.is_(None),
+    )
+    if lock:
+        query = query.with_for_update()
+    return query.one_or_none()
+
+
+def _decision_from_row(row: FormalDecisionRevision) -> FormalDecision:
+    payload: dict[str, Any] = dict(row.payload)
+    superseded_at = _datetime_text(row.superseded_at)
+    temporal = dict(payload.get("temporal") or {})
+    temporal["superseded_at"] = superseded_at
+    payload["temporal"] = temporal
+    authority = dict(payload.get("authority_context") or {})
+    authority_temporal = dict(authority.get("temporal") or {})
+    authority_temporal["superseded_at"] = superseded_at
+    authority["temporal"] = authority_temporal
+    payload["authority_context"] = authority
+    return FormalDecision.from_mapping(payload)
+
+
+def _validate_decision(decision: FormalDecision, *, tenant_id: str) -> None:
+    if decision.reference.owner_module != "decisions":
+        raise DecisionStoreError("Formal Decisions persisted in the registry must be owned by Decisions.")
+    if decision.reference.tenant_id != tenant_id:
+        raise DecisionStoreError("Formal Decisions cannot cross tenants.")
+    if decision.reference.version != decision.temporal.revision:
+        raise DecisionStoreError("Decision reference version must match its temporal revision.")
+    if decision.temporal.superseded_at is not None:
+        raise DecisionStoreError("Clients cannot set Decision superseded_at.")
+
+
+def _validate_temporal(temporal: TemporalRevision) -> None:
+    _recorded_at(temporal)
+    if not str(temporal.change_reason or "").strip():
+        raise DecisionStoreError("A Decision revision requires recorded_at and change_reason.")
+
+
+def _recorded_at(temporal: TemporalRevision) -> datetime:
+    if temporal.recorded_at is None:
+        raise DecisionStoreError("A Decision revision requires recorded_at.")
+    return temporal.recorded_at
+
+
+def _principal_tenant(principal: object) -> str:
+    tenant_id = str(getattr(principal, "tenant_id", "") or "").strip()
+    if not tenant_id:
+        raise InstitutionalContextError("Decision 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("Decision registry 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__ = ["DecisionStoreError", "SqlDecisionRegistry", "decision_from_mapping", "list_decisions", "reference_from_mapping"]

src/govoplan_decisions/py.typed

@@ -0,0 +1 @@
+

tests/test_decisions.py

@@ -0,0 +1,101 @@
+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 (
+    ActorRepresentationReference,
+    EvidenceReference,
+    FormalDecision,
+    GovernedContextEnvelope,
+    InstitutionalReference,
+    LegalBasisReference,
+    TemporalRevision,
+    revise_formal_decision,
+)
+from govoplan_decisions.backend.db.models import FormalDecisionRevision
+from govoplan_decisions.backend.service import DecisionStoreError, SqlDecisionRegistry
+
+
+NOW = datetime(2026, 8, 1, 12, 0, tzinfo=UTC)
+
+
+@dataclass
+class Principal:
+    tenant_id: str = "tenant-1"
+    account_id: str = "account-1"
+
+
+def reference(kind: str, object_id: str, owner: str, version: str | None = "1") -> InstitutionalReference:
+    return InstitutionalReference(kind=kind, owner_module=owner, object_id=object_id, tenant_id="tenant-1", version=version, valid_at=NOW)  # type: ignore[arg-type]
+
+
+def decision() -> FormalDecision:
+    temporal = TemporalRevision(revision="1", valid_from=NOW, recorded_at=NOW, change_reason="Decision accepted.")
+    decision_ref = reference("decision", "decision-1", "decisions")
+    mandate_ref = reference("mandate", "mandate-1", "mandates", "7")
+    evidence = EvidenceReference(kind="record", owner_module="committee", evidence_id="minutes-1", tenant_id="tenant-1", version="1", captured_at=NOW)
+    basis = LegalBasisReference(kind="statute", authority="Council", reference="rules:12", version="2026")
+    context = GovernedContextEnvelope(
+        tenant_id="tenant-1",
+        temporal=temporal,
+        actor=ActorRepresentationReference(tenant_id="tenant-1", account_id="account-1", identity_id="identity-1", mandate_ref=mandate_ref),
+        mandate_ref=mandate_ref,
+        decision_ref=decision_ref,
+        legal_bases=(basis,),
+        evidence=(evidence,),
+    )
+    return FormalDecision(
+        reference=decision_ref,
+        temporal=temporal,
+        decision_type="committee.resolution",
+        subject_refs=(reference("case", "case-1", "cases"),),
+        state="decided",
+        authority_context=context,
+        fact_evidence=(evidence,),
+        legal_bases=(basis,),
+        operative_result="Approved.",
+        reasoning="Requirements are met.",
+    )
+
+
+class DecisionTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self.engine = create_engine("sqlite+pysqlite:///:memory:")
+        FormalDecisionRevision.__table__.create(self.engine)
+        self.session = Session(self.engine)
+        self.principal = Principal()
+
+    def tearDown(self) -> None:
+        self.session.close()
+        self.engine.dispose()
+
+    def test_record_replay_revise_and_exact_history(self) -> None:
+        registry = SqlDecisionRegistry()
+        first = registry.record_decision(self.session, self.principal, decision=decision())
+        self.assertEqual(first, registry.record_decision(self.session, self.principal, decision=decision()))
+        temporal = TemporalRevision(revision="2", valid_from=NOW, recorded_at=NOW + timedelta(minutes=1), change_reason="Effect confirmed.")
+        revised = revise_formal_decision(first, expected_revision="1", temporal=temporal, state="effective")
+        registry.record_decision(self.session, self.principal, decision=revised, expected_revision="1")
+        current = registry.get_decision(self.session, self.principal, reference=reference("decision", "decision-1", "decisions", None))
+        historical = registry.get_decision(self.session, self.principal, reference=first.reference)
+        self.assertEqual("2", current.temporal.revision if current else None)
+        self.assertEqual("1", historical.temporal.revision if historical else None)
+
+    def test_occ_and_tenant_isolation(self) -> None:
+        registry = SqlDecisionRegistry()
+        first = registry.record_decision(self.session, self.principal, decision=decision())
+        temporal = TemporalRevision(revision="2", valid_from=NOW, recorded_at=NOW + timedelta(minutes=1), change_reason="Effect confirmed.")
+        revised = revise_formal_decision(first, expected_revision="1", temporal=temporal, state="effective")
+        with self.assertRaisesRegex(DecisionStoreError, "stale"):
+            registry.record_decision(self.session, self.principal, decision=revised, expected_revision="0")
+        with self.assertRaisesRegex(Exception, "same-tenant"):
+            registry.get_decision(self.session, Principal("tenant-2"), reference=first.reference)
+
+
+if __name__ == "__main__":
+    unittest.main()