python

SQLAlchemy table does not exist

sqlalchemy\.exc\.ProgrammingError.*relation.*does not exist

Fixes

1.Run alembic upgrade head to apply migrations
2.Use Base.metadata.create_all(engine) for development
3.Check schema name if using non-default PostgreSQL schema

sqlalchemymigration

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