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+# Schema Migration Plan v1.0.0
+
+## Goal
+
+Production server (port 3002, `target/release/momentry`) should use `public` schema.
+Dev server (port 3003, `momentry_playground`) should use `dev` schema.
+
+## Steps
+
+### ✅ Step 1: Copy dev → public (已完成)
+
+```sql
+-- For each table in dev that isn't in public:
+CREATE TABLE public.{table} (LIKE dev.{table} INCLUDING ALL);
+INSERT INTO public.{table} SELECT * FROM dev.{table};
+
+-- For tables that exist in both:
+TRUNCATE public.{table} CASCADE;
+INSERT INTO public.{table} SELECT * FROM dev.{table};
+```
+
+⚠️ **教訓**: `TRUNCATE` 要在確認能成功 INSERT 之後才執行，或使用 transactional approach。
+
+### ⬜ Step 2: Update sequences
+
+```sql
+SELECT setval('public.chunks_id_seq', (SELECT MAX(id) FROM public.chunks));
+SELECT setval('public.face_detections_id_seq', (SELECT MAX(id) FROM public.face_detections));
+SELECT setval('public.identities_id_seq', (SELECT MAX(id) FROM public.identities));
+SELECT setval('public.pre_chunks_id_seq', (SELECT MAX(id) FROM public.pre_chunks));
+SELECT setval('public.processor_results_id_seq', (SELECT MAX(id) FROM public.processor_results));
+SELECT setval('public.videos_id_seq', (SELECT MAX(id) FROM public.videos));
+```
+
+### ⬜ Step 3: Set indexes and constraints
+
+pg_dump with `--schema-only` from dev, apply to public to ensure identical structure.
+
+### ⬜ Step 4: Update production config
+
+`.env` 移除 `DATABASE_SCHEMA=dev`（production binary 預設用 `public`）
+
+### ⬜ Step 5: Restart production server
+
+```bash
+kill -9 $(lsof -ti :3002)
+# launchd will auto-restart with new binary
+```
+
+### ⬜ Step 6: Verify
+
+```bash
+curl http://localhost:3002/api/v1/file/{uuid}/face_trace/sortby -X POST -d '{"limit":1}'
+# → should return data from public schema
+```
+
+## Rollback
+
+If migration fails:
+- `public` tables with data can be reverted: `TRUNCATE public.{table}; INSERT INTO public.{table} SELECT * FROM dev.{table};`
+- `.env` can be reverted to `DATABASE_SCHEMA=dev`