Matt Perpick

for example, ``` with execute(self.conn, sql, [VERSION_TABLE]) as cursor: return bool(cursor.fetchall()) ``` is the same as: ``` with contextlib.closing(self.conn.execute(sql, [VERSION_TABLE]) as cursor: return bool(cursor.fetchall()) ```

add support for other databases

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thinking about adding support for other databases. some thoughts: - keep migrations from depending on caribou, for simplicity's sake - pass in the cx string into migration methods, then people...

anthropic: add optional callback handlers

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This pull request adds the ability to add callbacks to Anthropic LLM calls for observability and other use cases. It also adds the missing callback handler and tests. It follows...