Automate diary entries and add photo galleries

db/migrations/17_automatic_diary_entries.sql

@@ -0,0 +1,10 @@
+ALTER TABLE concert_diary
+ALTER COLUMN rating DROP NOT NULL;
+
+INSERT INTO concert_diary (user_id, concert_id)
+SELECT ca.user_id, ca.concert_id
+FROM concert_attendance ca
+JOIN concerts c ON c.id = ca.concert_id
+WHERE ca.status = 'attending'
+  AND COALESCE(c.end_datetime, c.start_datetime) < CURRENT_TIMESTAMP
+ON CONFLICT (user_id, concert_id) DO NOTHING;