Queries are left running and consume all database CPU

[saulcosta]

Hello!

When starting a console in read-only mode, a basic query (like a SELECT) is left running, even after the command has completed in the console itself. It appears to be the last query that was executed.

This results in the database's CPU usage continually climbing to a point where it finally is using almost all of the CPU. Once the query is killed or the console is closed, the CPU immediately drops to normal levels.

We are using gem version 0.5.0 and PostgreSQL 9.6.