update

lib/data/database/app_database.dart

@@ -8,12 +8,32 @@ import 'tables.dart';
 
 part 'app_database.g.dart';
 
-@DriftDatabase(tables: [Transactions, Categories, Budgets, ExchangeRates])
+@DriftDatabase(tables: [Transactions, Categories, Budgets, ExchangeRates, Accounts])
 class AppDatabase extends _$AppDatabase {
   AppDatabase() : super(_openConnection());
 
   @override
-  int get schemaVersion => 1;
+  int get schemaVersion => 3;
+
+  @override
+  MigrationStrategy get migration => MigrationStrategy(
+    onUpgrade: (migrator, from, to) async {
+      if (from == 1) {
+        await migrator.createTable(accounts);
+        await customStatement(
+          'INSERT INTO accounts (name, is_main, currency, sort_order, created_at) '
+          'VALUES (?, ?, ?, ?, ?)',
+          ['Main', 1, 'USD', 0, DateTime.now().millisecondsSinceEpoch],
+        );
+      }
+      if (from == 2) {
+        // Add currency column to existing accounts table
+        await customStatement(
+          'ALTER TABLE accounts ADD COLUMN currency TEXT NOT NULL DEFAULT "USD"',
+        );
+      }
+    },
+  );
 
   // ============================================================================
   // TRANSACTIONS