導入 browse.sh 比價診斷計畫

migrations/042_add_browse_diagnostics_to_match_attempts.sql

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+-- =============================================================================
+-- Migration 042: PChome browse.sh 診斷計畫欄位
+-- MOMO PRO — Price comparison fallback observability
+-- 2026-05-21 台北
+-- =============================================================================
+-- 說明:
+--   competitor_match_attempts 補存 browse.sh 診斷計畫 JSON。
+--   正式價格爬蟲仍維持 API-first；此欄位只保存低信心、無結果、
+--   單位價覆核或外部爬蟲錯誤時的 read-only probe plan，供人工或
+--   opt-in 執行 `browse get/open` 做 selector / XHR / 商品頁取證。
+-- =============================================================================
+
+ALTER TABLE IF EXISTS competitor_match_attempts
+    ADD COLUMN IF NOT EXISTS browse_diagnostic_json JSONB;
+
+CREATE INDEX IF NOT EXISTS idx_comp_match_attempts_browse_diag_time
+    ON competitor_match_attempts (attempted_at DESC)
+    WHERE browse_diagnostic_json IS NOT NULL;
+
+DO $$
+BEGIN
+    RAISE NOTICE '✅ Migration 042 完成 — PChome browse.sh 診斷計畫欄位已補齊';
+END $$;