refactor code interacting with pool for consistency, and misc fixes #2398
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Largely, this collects all interaction with the connection pool in AppState helpers
usePool
andreleasePool
. (It's not obviously better to useAppState.usePool
in place ofSQL.use . AppState.getPool
, but for now this approach is more consistent than what we had before, and will allow easily doing things like putting the pool in an IORef in the context of #2391.)