Since I moved my database from a mssql docker container to an azure database as a service my web application( flask) is being disconnected after several minutes.
It is simply solved by a refresh of the page but still, there is an issue here.
The error raised by SQLAlchemy is an Operational Error (https://docs.sqlalchemy.org/en/14/errors.html#error-e3q8)
I tried to implement the pool_pre_ping=True option in the create_engine function the error is not solved.
I think the disconnect is initiated by the database but I do not know if there is an option to change that. (database is SQL Server 12.0)
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Answer
As I am using Flask-SQLAlchemy there are configuration parameters to recycle the pool.
I solved my problem by removing the create_engine function.
I simply add SQLALCHEMY_POOL_RECYCLE = 300 to my configuration file.