Initial commit: PastPaper Master full stack

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

supabase/migrations/003_question_taxonomy_fields.sql

@@ -0,0 +1,41 @@
+-- ============================================
+-- PastPaper Master — Question taxonomy fields
+-- Version: 003
+-- Date: 2026-03-24
+-- ============================================
+
+-- A question needs multiple classification layers:
+-- 1) question_format: how the student interacts with it
+-- 2) topic_tags / topic_primary / analytics_topic: course knowledge taxonomy
+-- 3) skill_tags: what kind of thinking task the question requires
+ALTER TABLE paper_questions
+  ADD COLUMN IF NOT EXISTS question_format TEXT
+    CHECK (
+      question_format IN (
+        'mc',
+        'true_false',
+        'fill_blank',
+        'short_answer',
+        'long_answer',
+        'coding'
+      )
+    ),
+  ADD COLUMN IF NOT EXISTS topic_primary TEXT,
+  ADD COLUMN IF NOT EXISTS analytics_topic TEXT,
+  ADD COLUMN IF NOT EXISTS topic_tags TEXT[],
+  ADD COLUMN IF NOT EXISTS skill_tags TEXT[];
+
+-- Keep the legacy topics column for backward compatibility for now.
+-- New analytics and retrieval code should gradually move to analytics_topic/topic_tags.
+
+CREATE INDEX IF NOT EXISTS idx_questions_question_format
+  ON paper_questions(question_format);
+
+CREATE INDEX IF NOT EXISTS idx_questions_analytics_topic
+  ON paper_questions(analytics_topic);
+
+CREATE INDEX IF NOT EXISTS idx_questions_topic_tags
+  ON paper_questions USING GIN(topic_tags);
+
+CREATE INDEX IF NOT EXISTS idx_questions_skill_tags
+  ON paper_questions USING GIN(skill_tags);