优化数据库迁移

apps/backend/src/db/migrations/001_init.sql

@@ -73,6 +73,9 @@ CREATE TABLE IF NOT EXISTS orders (
   UNIQUE(provider, platform, shop_id, platform_order_id)
 );
 
+CREATE INDEX IF NOT EXISTS idx_orders_platform_order_lookup
+  ON orders(provider, platform, platform_order_id, id DESC);
+
 CREATE TABLE IF NOT EXISTS order_items (
   id BIGSERIAL PRIMARY KEY,
   order_id BIGINT NOT NULL REFERENCES orders(id) ON DELETE CASCADE,

apps/backend/src/db/migrations/002_admin_session_version.sql

@@ -1,2 +0,0 @@
-ALTER TABLE admin_users
-  ADD COLUMN IF NOT EXISTS session_version INTEGER NOT NULL DEFAULT 1;

apps/backend/src/db/migrations/003_drop_legacy_fulfillment_rules.sql

@@ -1,2 +0,0 @@
-DROP TABLE IF EXISTS product_match_rules;
-DROP TABLE IF EXISTS sku_fulfillment_bindings;

apps/backend/src/db/migrations/004_order_platform_order_lookup.sql

@@ -1,2 +0,0 @@
-CREATE INDEX IF NOT EXISTS idx_orders_platform_order_lookup
-  ON orders(provider, platform, platform_order_id, id DESC);