_conn.execute() is not thread-safe for concurrent calls from multiple
threads. asyncio.gather submits each analytics query to the thread pool
via asyncio.to_thread, causing race conditions that silently returned
empty result sets. _conn.cursor() creates an independent cursor that is
safe to use from separate threads simultaneously.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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