On OperationalError, sql_update and run_sql_select were calling
sql_connect() → reconnect_db() which disposes the entire connection
pool mid-flight, killing other in-flight connections under concurrency.
Removed the sql_connect() calls; the existing retry blocks already open
a fresh engine.connect() context manager, and pool_pre_ping=True handles
stale connection detection. Also drops the now-unused sql_connect import.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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