Reduce SQLA connection pool size to 5

[jonathan-d-zhang]

Currently, the database is configured to have 25 max connections, with 3 reserved for superuser connections.

Closes #231.

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Speaking this into existence just to hear myself say it and to go on record-- this is not a production password, and is associated with a test instance of PostgreSQL that is built locally during development.

[jonathan-d-zhang]

Sounds reasonable to make configurable