Fixes #1441

This is a patch-level PR that swaps out the default implementation of insert_ for one that does not perform a secondary query. In local testing, this fixes the issue where insert and insert_ take the same amount of time for SQLite. All tests pass locally for postgresql. There is likely not a performance benefit for Postgres since it';sa ble to do insert ... returning ... However, the code never demands the result, so it is probably not parsed.

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