feat: basic database functionality

lib/data/dao/statistic_scope_dao.dart

@@ -0,0 +1,55 @@
+import 'package:drift/drift.dart';
+import 'package:tallee/core/enums.dart';
+import 'package:tallee/data/db/database.dart';
+import 'package:tallee/data/db/tables/statistic_scope_table.dart';
+
+part 'statistic_scope_dao.g.dart';
+
+@DriftAccessor(tables: [StatisticScopeTable])
+class StatisticScopeDao extends DatabaseAccessor<AppDatabase>
+    with _$StatisticScopeDaoMixin {
+  StatisticScopeDao(super.db);
+
+  /// Retrieves a list of statistic scopes associated with a specific statistic ID.
+  Future<List<StatisticScope>> getScopeForStatistic(String statisticId) async {
+    final query = select(statisticScopeTable)
+      ..where((tbl) => tbl.statisticId.equals(statisticId));
+
+    final results = await query.get();
+    return results
+        .map(
+          (result) => StatisticScope.values.firstWhere(
+            (e) => e.name == result.scope,
+            orElse: () => throw Exception(
+              'Invalid scope value: ${result.scope} for statistic ID: $statisticId',
+            ),
+          ),
+        )
+        .toList();
+  }
+
+  Future<bool> addStatisticScopes({
+    required String statisticId,
+    required List<StatisticScope> scopes,
+  }) async {
+    final entries = scopes
+        .map(
+          (scope) => StatisticScopeTableCompanion.insert(
+            statisticId: statisticId,
+            scope: scope.name,
+          ),
+        )
+        .toList();
+
+    return batch((batch) {
+      batch.insertAll(
+        statisticScopeTable,
+        entries,
+        mode: InsertMode.insertOrReplace,
+      );
+    }).then((_) => true).catchError((error) {
+      print('Error adding statistic scopes: $error');
+      return false;
+    });
+  }
+}