fix: migration 036 — delete old channels before altering constraint + remove TravelLine refs + hide hotel_admin from roles tab

backend/migrations/036_channels_ru.sql

@@ -1,4 +1,7 @@
--- Replace old channel constraint with Russian market channels
+-- Remove old non-RU channels FIRST (before changing constraint)
+DELETE FROM channels WHERE name IN ('airbnb', 'expedia', 'vrbo');
+
+-- Now safely replace constraint
 ALTER TABLE channels DROP CONSTRAINT IF EXISTS channels_name_check;
 ALTER TABLE channels ADD CONSTRAINT channels_name_check
   CHECK (name IN (
@@ -12,9 +15,6 @@ ALTER TABLE channels ADD CONSTRAINT channels_name_check
     'onetwotrip'
   ));
 
--- Remove old non-RU channels from all hotels
-DELETE FROM channels WHERE name IN ('airbnb', 'expedia', 'vrbo');
-
 -- Add new Russian channels for all existing hotels (skip if already exists)
 INSERT INTO channels (hotel_id, name)
 SELECT h.id, c.name