feat: basic database functionality

lib/data/db/tables/statistic_table.dart

@@ -0,0 +1,10 @@
+import 'package:drift/drift.dart';
+
+class StatisticTable extends Table {
+  TextColumn get id => text()();
+  TextColumn get type => text()();
+  TextColumn get timeframe => text().nullable()();
+
+  @override
+  Set<Column<Object>> get primaryKey => {id};
+}