python

Alembic can't locate migration revision

alembic\.util\.exc\.CommandError.*Can't locate revision

Fixes

1.Check migration files exist in alembic/versions/
2.Verify alembic_version table has a valid revision hash
3.Use 'alembic stamp' to fix the version tracking table

sqlalchemyalembic

Related Errors

Asyncio event loop already running

RuntimeError: This event loop is already running

•Use nest_asyncio.apply() to allow nested event loops
•Use asyncio.run_coroutine_threadsafe() instead of asyncio.run()

Coroutine never awaited

RuntimeWarning: coroutine '.*' was never awaited

•Add 'await' before the coroutine call
•Use asyncio.create_task() to schedule the coroutine

Asyncio task was cancelled

asyncio\.CancelledError

•Handle CancelledError in try/except within the task
•Use asyncio.shield() to protect critical sections from cancellation