feat: add historical data

test/database_migration_test.dart

@@ -89,4 +89,9 @@ void main() {
 
     expect(orphan, isNull);
   });
+
+  test('creates an empty tab event outbox', () async {
+    expect(await database.select(database.tabEvents).get(), isEmpty);
+    expect((await database.select(database.barTabs).get()), hasLength(1));
+  });
 }