Initial commit: PastPaper Master full stack

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

supabase/migrations/008_fix_storage_url_placeholder.sql

@@ -0,0 +1,27 @@
+-- 008: Replace __SUPABASE_STORAGE_PUBLIC_BASE_URL__ placeholder in paper URLs
+--
+-- The course-library seed (comp2211_course_library_papers.sql) was inserted
+-- without substituting the placeholder.  This migration replaces it with the
+-- real Supabase Storage public base URL for the `papers` bucket.
+
+UPDATE papers
+SET paper_file_url = REPLACE(
+  paper_file_url,
+  '__SUPABASE_STORAGE_PUBLIC_BASE_URL__',
+  'https://pvcxipwovpwrurebouwg.supabase.co/storage/v1/object/public/papers'
+)
+WHERE paper_file_url LIKE '%__SUPABASE_STORAGE_PUBLIC_BASE_URL__%';
+
+UPDATE papers
+SET answer_file_url = REPLACE(
+  answer_file_url,
+  '__SUPABASE_STORAGE_PUBLIC_BASE_URL__',
+  'https://pvcxipwovpwrurebouwg.supabase.co/storage/v1/object/public/papers'
+)
+WHERE answer_file_url LIKE '%__SUPABASE_STORAGE_PUBLIC_BASE_URL__%';
+
+-- Verify: should return 0 rows
+SELECT id, course_code, year, term, exam_type, paper_file_url, answer_file_url
+FROM papers
+WHERE paper_file_url  LIKE '%__SUPABASE_STORAGE_PUBLIC_BASE_URL__%'
+   OR answer_file_url LIKE '%__SUPABASE_STORAGE_PUBLIC_BASE_URL__%';