sync product to local

lib/core/database/migration_handler.dart

@@ -0,0 +1,29 @@
+import 'package:sqflite/sqflite.dart';
+
+class DatabaseMigrationHandler {
+  static Future<void> migrate(
+      Database db, int oldVersion, int newVersion) async {
+    if (oldVersion < 2) {
+      // Add indexes for better performance
+      await db.execute(
+          'CREATE INDEX IF NOT EXISTS idx_products_name_search ON products(name)');
+      await db.execute(
+          'CREATE INDEX IF NOT EXISTS idx_products_sku_search ON products(sku)');
+    }
+
+    if (oldVersion < 3) {
+      // Add full text search support
+      await db.execute(
+          'CREATE VIRTUAL TABLE products_fts USING fts5(name, sku, description, content=products, content_rowid=rowid)');
+      await db.execute(
+          'INSERT INTO products_fts SELECT name, sku, description FROM products');
+    }
+
+    if (oldVersion < 4) {
+      // Add sync tracking
+      await db.execute('ALTER TABLE products ADD COLUMN last_sync_at TEXT');
+      await db.execute(
+          'ALTER TABLE products ADD COLUMN sync_version INTEGER DEFAULT 1');
+    }
+  }
+}