feat: add database migration

lib/services/migration/migration_service.dart

@@ -1,3 +1,5 @@
+import 'dart:developer';
+
 import 'package:isar/isar.dart';
 
 import '../../common/constants/constants.dart';
@@ -19,6 +21,8 @@ class MigrationService {
     switch (databaseVersion) {
       case 1:
         await _migrateToV2();
+      case 2:
+        await _migrateToV3();
     }
   }
 
@@ -63,4 +67,34 @@ class MigrationService {
     // Update the database version
     await PreferenceKey.databaseVersion.set(2);
   }
+
+  /// Migrates the database to version 3.
+  ///
+  /// Sets the new `id` and `archived` fields of each rich text note.
+  Future<void> _migrateToV3() async {
+    logger.i('Migrating the database from version 2 to version 3');
+
+    // Get the rich text notes
+    final richTextNotes = await _databaseService.database.richTextNotes.where().findAll();
+    log(richTextNotes.map((n) => n.toJson()).toString());
+
+    // Set the rich text notes 'id' and 'archived' fields
+    for (final note in richTextNotes) {
+      note.id = uuid.v4();
+      note.archived = false;
+      await _notesService.put(note);
+    }
+
+    // Check that the migration succeeded
+    final richTextNotesCount = await _databaseService.database.richTextNotes.count();
+    final richTextNotesNotArchivedCount =
+        await _databaseService.database.richTextNotes.where().archivedEqualTo(false).count();
+    assert(
+      richTextNotesCount == richTextNotesNotArchivedCount,
+      'The count of rich text notes ($richTextNotesCount) is different from the count of not archived rich text notes ($richTextNotesNotArchivedCount) after the migration to v3',
+    );
+
+    // Update the database version
+    await PreferenceKey.databaseVersion.set(3);
+  }
 }