support for riverpod persistence

app/lib/features/user/data/database/riverpod_storage.dart

@@ -0,0 +1,57 @@
+import 'dart:async';
+
+import 'package:drift/drift.dart';
+import 'package:nullability/nullability.dart';
+import 'package:riverpod/experimental/persist.dart';
+import 'package:weblibre/features/user/data/database/database.dart';
+import 'package:weblibre/features/user/data/database/definitions.drift.dart';
+
+final class RiverpodStorage extends Storage<String, String> {
+  final UserDatabase _db;
+
+  RiverpodStorage(this._db);
+
+  @override
+  Future<void> delete(String key) {
+    return _db.riverpod.deleteWhere((x) => x.key.equals(key));
+  }
+
+  @override
+  Future<void> deleteOutOfDate() {
+    return _db.riverpod.deleteWhere(
+      (x) => x.expireAt.isSmallerThanValue(DateTime.now()),
+    );
+  }
+
+  @override
+  Future<PersistedData<String>?> read(String key) async {
+    final query = _db.riverpod.select()..where((x) => x.key.equals(key));
+
+    final data = await query.getSingleOrNull();
+
+    return data.mapNotNull(
+      (data) => PersistedData(
+        data.json,
+        destroyKey: data.destroyKey,
+        expireAt: data.expireAt,
+      ),
+    );
+  }
+
+  @override
+  Future<void> write(String key, String value, StorageOptions options) {
+    return _db.riverpod.insertOne(
+      RiverpodCompanion.insert(
+        key: key,
+        json: value,
+        destroyKey: Value(options.destroyKey),
+        expireAt: Value(
+          options.cacheTime.duration.mapNotNull(
+            (duration) => DateTime.now().add(duration),
+          ),
+        ),
+      ),
+      mode: InsertMode.insertOrReplace,
+    );
+  }
+}