All three were missing the transient-connection retry that sql_update and
run_sql_select already had. On OperationalError (stale/dropped connection),
each now retries once with a fresh engine.connect() without disposing the pool.
IntegrityError (duplicate key, FK violation, NOT NULL) continues to return
None without retrying — the same data would fail again and None signals a
data conflict to callers, distinct from False (error) or an int (success).
sql_insert_or_update retry is safe because ON DUPLICATE KEY UPDATE is idempotent.
sql_insert retry is safe because OperationalError means MariaDB rolled back.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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