chore(db): drop dead tables (product_pages, matches) — schema cleanup Phase 1

backend/data/drop_dead_tables.sql

@@ -0,0 +1,23 @@
+-- Migration: Phase 1 schema cleanup — drop confirmed-dead tables
+--
+-- See docs/schema-redesign.md for the full evaluation. These two tables are the
+-- only "safe now" deletions: both have 0 rows, 0 inbound foreign keys, and no
+-- references in any application code (frontend or backend).
+--
+--   public.product_pages  — superseded by youtube_shorts as the public showcase
+--                           page; never referenced anywhere. 0 rows.
+--   public.matches        — v1 of the matching pipeline; replaced by
+--                           product_creator_matches. Only a coincidental dict
+--                           key "matches" exists in code, no table calls. 0 rows.
+--
+-- Verified pre-drop (2026-05-31): both tables 0 rows, 0 inbound FK constraints.
+--
+-- Status: applied to the live DB via Supabase MCP on 2026-05-31.
+-- Idempotent: uses IF EXISTS.
+
+drop table if exists public.product_pages;
+drop table if exists public.matches;
+
+-- Note: public.matches depends on the match_status enum. The enum is left in
+-- place (harmless if unused); drop separately only if confirmed unused elsewhere:
+--   drop type if exists match_status;