Why: - Establish the application-owned relational source of truth for tenants, authentication, ingestion, audit, graph runs, LLM usage, and feedback. Changes: - Define SQLAlchemy 2.x and Alembic conventions. - Specify tenant, API-key, ingestion, audit, graph-run, pricing, usage, and feedback tables. - Document indexing, retention, privacy, and multitenancy rules. Impact: - Postgres schema changes must be implemented through Alembic migrations. - FastAPI must not run DDL during startup. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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