release should reset state of connection

[daurnimator]

When a connection is released back to the pool, the connection should be reset to a clean state.
This should probably be done by running

rollback;
discard all;

Alternatively/additionally, you should expose an event for a connection being added back to the pool. This would allow the query to be customisable.

Other pooling implementations have similar facilities, e.g. pgbouncer has the configuration parameter server_reset_query

[charmander]

(Formerly brianc/node-postgres#391 – from when the pool was part of pg)