Initial commit: PastPaper Master full stack

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

supabase/migrations/005_allow_long_question_format_alias.sql

@@ -0,0 +1,27 @@
+-- ============================================
+-- PastPaper Master — Allow legacy long_question format alias
+-- Version: 005
+-- Date: 2026-03-24
+-- ============================================
+--
+-- Some existing seeds and older generated SQL used `long_question` in the
+-- `question_format` column, while the 003 taxonomy migration introduced
+-- `long_answer` as the canonical value. Allow both temporarily so historical
+-- inserts do not fail. New generators should continue emitting `long_answer`.
+
+ALTER TABLE paper_questions
+  DROP CONSTRAINT IF EXISTS paper_questions_question_format_check;
+
+ALTER TABLE paper_questions
+  ADD CONSTRAINT paper_questions_question_format_check
+  CHECK (
+    question_format IN (
+      'mc',
+      'true_false',
+      'fill_blank',
+      'short_answer',
+      'long_answer',
+      'long_question',
+      'coding'
+    )
+  );