fix: Increase connection pool to 20 concurrent database connections #1924
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Due to the asynchronous nature of FastAPI and the number of requests, it can happen that we have to handle more than the default of 5 requests at the same time.
In addition, reduce the pool timeout to 5. The goal is to fail requests if they can't get a database session within 5 seconds instead of spawning a queue with wait times of 30 seconds, which can lead to a blocking backend.
Resolves #1914