python

SQLAlchemy relationship copying column warning

sqlalchemy\.exc\.SAWarning.*relationship .* will copy column

Fixes

1.Set overlaps parameter on relationship: overlaps='other_rel'
2.Use back_populates instead of backref for explicit relationships
3.Review foreign key constraints for circular references

sqlalchemyrelationships

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