Float epoch seconds carry ~16 significant digits, exceeding float64 precision,
and the arm path compares an in-memory created_at against the DB-stored
waiting_since. A float rounds differently on each side, so the armed key never
matched at fire time and the awaiting-agent automation was always skipped.
Use strftime('%s%6N') (integer microseconds) on both paths.
Tanmay Deep Sharma
e2cd372d2d