Add the PostgreSQL backend, migration and stopped-write transfer tools, lease-aware deployment manifests, tenancy declarations, and shared conformance coverage. Persist grouping mutations in durable stores and separate process liveness from database readiness.
Python 3.12 + FastAPI, pyproject.toml + Makefile mirroring
qonto-assistant's exactly. src/tenant_engine/{domain,store,app,main}.py:
- domain.py: Tenant, CapabilityRole (PLTF/IAM/VEN/CUS), RoleGrant,
PlanAssignment, create_role_grant() enforcing ADR-0014's invariants.
Refinement made while implementing: platform_default grants are valid
for trial-grouped tenants OR the reserved tenant:platform/tenant:coulomb
tenants (their baseline roles were never purchased either) -- the task
spec only named the trial case.
- store.py: TenantStore Protocol + InMemoryTenantStore, every mutation
emits a DomainEvent per the boundary contract's Audit Correlation
Contract.
- app.py/main.py: FastAPI factory + /health endpoint, verified live on
127.0.0.1:8090.
29 tests passing, including non-exclusive role coexistence (CUS+VEN
simultaneously) and append-only revoke semantics.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
