Flask-SQLAlchemy: SQLALCHEMY_ENGINE_OPTIONS not set up correctly

Question

I just updated my projects Flask-SQLAlchemy Version to the latest one (v2.4). As some of the SQL-Alchemy config parameters were deprecated, I now follow the documentation an

Answer 1

As you have already mentioned in the comment the problem was in the pool parameter.

SQLAlchemy documentation specifies that an instance of Pool or QueuePool could be a pool parameter.

The valid example is:

SQLALCHEMY_ENGINE_OPTIONS = {
    'pool': QueuePool(creator),
    'pool_size': 10,
    'pool_recycle': 120,
    'pool_pre_ping': True
}