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# Description closes #2782. Changes `sqlalchemy` connection pooling config : - **pool_pre_ping=True** : pessimistic disconnect handling. > - It is critical to note that the pre-ping approach does not accommodate **for connections dropped in the middle of transactions or other SQL operations** ! But this should only happen if we lose the database either due to network of DB server restart. - **pool_size=10**, with no db side pooling for now, if 6 uvicorn process workers are spawned (or 6 instances of the backed) we have a pool of 60 processes connecting to the database. - **pool_recycle=1800** : Recycles the pool every 30min Added additional session config : - expire_on_commit=False, When True, all instances will be fully expired after each commit, so that all attribute/object access subsequent to a completed transaction will load from the most recent database state. - autoflush=False, query operations will issue a Session.flush() call to this Session before proceeding. We are calling `session.commit` (which flushes) on each repository method so ne need to reflush on subsequent access |
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