adds keepalive values to postgresql config #3333
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This was referenced Apr 16, 2024
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Closes #2305
Closes #2784
Related to pulibrary/bibdata#1566 and pulibrary/bibdata#1959
Controls TCP keepalive settings for postgresql using database configuration instead of accepting the default settings from the operating system.
Creating this as a draft until we determine the best time intervals to try. The current OS settings wait 2 hours before closing an inactive connection. Our goal is to close unused connections quickly enough that there are always connections available when they are needed, while still allowing enough time for long-running connections to finish their work.