Why:
- Establish explicit ownership and lifetime rules for application, request/job, and operation-scoped resources.
Changes:
- Define FastAPI lifespan ownership for engines, clients, graphs, and pools.
- Define dependency-managed sessions and request context.
- Require explicit transaction boundaries and dependency passing.
- Prohibit shared global SQLAlchemy sessions and import-time network clients.
Impact:
- Application resources are created and closed by their process owner.
- Request and job resources must not be shared across concurrent units of work.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
