pre-ping db pool, increased poll recycle from 4.5min to 1h
pre-ping db pool, increased poll recycle from 4.5min to 1h

https://docs.sqlalchemy.org/en/14/core/pooling.html#dealing-with-disconnects
https://stackoverflow.com/questions/55457069/how-to-fix-operationalerror-psycopg2-operationalerror-server-closed-the-conn
https://github.com/pallets-eco/flask-sqlalchemy/issues/589#issuecomment-361075700=

thenetcircle/dino,thenetcircle/dino,thenetcircle/dino,thenetcircle/dino