feat(group-booking): draft schedules, coach-scoped seating, mixed classes

apps/edr-passenger-api/prisma/migrations/20260908120000_add_trip_status_draft/migration.sql

@@ -0,0 +1,13 @@
+-- Adds the DRAFT value to passenger."TripStatus".
+--
+-- This migration deliberately contains NOTHING ELSE. Postgres cannot use a newly added enum
+-- value inside the same transaction that adds it, and Prisma wraps each migration file in one
+-- transaction — so any DDL or DML that references 'DRAFT' must live in a LATER migration file.
+--
+-- IF NOT EXISTS makes it idempotent, so a re-run (or a database where it was applied out of
+-- band) is a no-op rather than a failure.
+--
+-- BEFORE 'SCHEDULED' keeps the physical enum order identical to the declaration order in
+-- schema.prisma, so `prisma migrate diff` sees no drift. (PG 15 here; ADD VALUE ... BEFORE has
+-- been available since 9.1 and IF NOT EXISTS since 12.)
+ALTER TYPE passenger."TripStatus" ADD VALUE IF NOT EXISTS 'DRAFT' BEFORE 'SCHEDULED';