Resolves: #RHEL-153811
Backport upstream fixes for database connection pool exhaustion
that occurred during multi-host push attestation with multiple
agents, causing QueuePool timeout and HTTP 500 errors.
Upstream commits:
- 5b622eae Close DB sessions to prevent connection exhaustion
- bc28d5d2 Include thread-safe session management
- 4f5f09a6 Address some improvements from code review
- 309a0ef0 Fix race condition in SessionManager
- e75921f0 Fix linter errors in PersistableModel.get() and .all()
- 2d809d8b refactor: Remove dead code AuthSession.authenticate_agent()
- e935df8f db: Clean up scoped session after each request
- 08c0c67c fix: Check active flag in _extract_identity and guard receive_pop
- d74e7499 fix: Add fork-safety to DBManager via dispose()
Signed-off-by: Sergio Arroutbi <sarroutb@redhat.com>
