Fork Sync: Update from parent repository #4
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This adds a new configurable connection string for postgres writes.
This is an experimental change to see if we can reduce memory usage with large SQLite databases. If successful, we'll do this again and further reduce the database mmap size. This will cause greater use of the page cache, but that is more easily reclaimed by the kernel, and should reduce memory pressure, as well as making it clearer how much memory the application is actually using for connections, subscriptions, etc.
On lightly loaded relays, we free up memory faster by letting idle connections be reclaimed in 10 seconds instead of the default 10 minutes. This also sets the minimum to zero connections, instead of always trying to hold one open.
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