anmolxlight opened a new pull request, #66674:
URL: https://github.com/apache/airflow/pull/66674

   ## What
   
   Fixes external DB manager upgrades when manager-owned tables already exist 
but the manager-specific Alembic version table does not.
   
   Previously, `BaseDBManager.upgradedb()` treated that state as an empty 
database, called `create_db_from_orm()`, and stamped the manager to head. 
Because `metadata.create_all()` is a no-op for existing tables, migration 
bodies were skipped while Alembic believed the schema was current.
   
   ## Why
   
   This breaks upgrades such as Airflow 3.1 + edge3 1.x to Airflow 3.2 + edge3 
3.4, where `edge_job`, `edge_worker`, and `edge_logs` already exist from the 
pre-`EdgeDBManager` era, but `alembic_version_edge3` does not. The old path 
stamped edge3 to head without applying migrations that add columns like 
`edge_worker.concurrency` and `edge_job.team_name`.
   
   ## How
   
   - Detect existing manager-owned tables before falling back to ORM creation 
in `BaseDBManager.upgradedb()`.
   - If tables exist with no manager revision, stamp the manager to its base 
revision, then run Alembic upgrade to heads.
   - Apply the same behavior to `FABDBManager.upgradedb()`, which has its own 
upgrade implementation.
   - Add generic `BaseDBManager` tests plus edge3 and FAB coverage.
   
   ## Tests
   
   - `uv run ruff check airflow-core/src/airflow/utils/db_manager.py 
airflow-core/tests/unit/utils/test_db_manager.py 
providers/edge3/tests/unit/edge3/models/test_db.py 
providers/fab/src/airflow/providers/fab/auth_manager/models/db.py 
providers/fab/tests/unit/fab/auth_manager/models/test_db.py`
   - `uv run --project airflow-core pytest 
airflow-core/tests/unit/utils/test_db_manager.py -q`
   - `uv run --project providers/edge3 pytest 
providers/edge3/tests/unit/edge3/models/test_db.py -q`
   - `uv run --project providers/fab pytest 
providers/fab/tests/unit/fab/auth_manager/models/test_db.py -q`
   
   Fixes: #66524
   


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