TransactionType.FIRST_SESSION_DISCOUNT ('first_session_discount', 22 chars) overflowed the VARCHAR(20) column, throwing in acceptPairingRequest AFTER the session was flipped to ACTIVE but before startSessionTimer/startSessionListener/PAIRED-notify ran. Every first-session-discount pairing thus half-completed: lost transaction row, no server-side timer, and a 500 to the mitra so its app never opened the chat. Widen the column (CREATE TABLE + idempotent ALTER). Deferred hardening (bookkeeping INSERT in the critical path) logged in TECH_DEBT.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Ramadhan Sjamsani
495eb98787