Squash logged errors from failed SQL rollbacks

Currently we unconditionally roll back transactions after error,
even if a commit has already been attempted. Commit is guaranteed
to end a transaction, though, whether by successfully committing
or by rolling back if that fails. As such, we attempt a double
rollback if a transaction fails at commit (for example, for a
constraint violation), which doesn't error but does log angry
warning messages. Ensure we don't try rolling back after commit
runs to prevent this.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #327
Approved by: rhatdan

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