Discard postgres connections periodically to free memory

[jberryman]

A workaround for hasura/graphql-engine#5087

[0x777]

@jberryman My concern with this workaround is that it might affect majority of our users negatively. This is based on my assumption that most of our users probably don't have a workload where their response sizes are in the order of MBs (and increasing over time).

If we have to include such a workaround, this parameter has to be configurable and the default has to be that the connection is not forcefully closed every 'x' seconds.

[jberryman]

@0x777 we now make this configurable like in --timeout with the default to no stale timeout.

most of our users probably don't have a workload where their response sizes are in the order of MBs (and increasing over time).

I'm not sure the best default. All it requires to trigger the behavior is:

• a relatively active server
• an occasional huge result set

[jberryman]

Linking the main PR which depends on this : hasura/graphql-engine#5089