refactored chat archive and added search

app/lib/features/chat_archive/data/providers.dart

@@ -0,0 +1,31 @@
+import 'package:bang_navigator/features/chat_archive/data/database/database.dart';
+import 'package:drift/drift.dart';
+import 'package:drift/native.dart';
+import 'package:path_provider/path_provider.dart' as path_provider;
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+import 'package:sqlite3/sqlite3.dart';
+import 'package:sqlite3_flutter_libs/sqlite3_flutter_libs.dart';
+import 'package:universal_io/io.dart';
+
+part 'providers.g.dart';
+
+@Riverpod()
+ChatSearchDatabase chatSearchDatabase(ChatSearchDatabaseRef ref) {
+  return ChatSearchDatabase(
+    LazyDatabase(() async {
+      // Also work around limitations on old Android versions
+      if (Platform.isAndroid) {
+        await applyWorkaroundToOpenSqlite3OnOldAndroidVersions();
+      }
+
+      // Make sqlite3 pick a more suitable location for temporary files - the
+      // one from the system may be inaccessible due to sandboxing.
+      final cachebase = (await path_provider.getTemporaryDirectory()).path;
+      // We can't access /tmp on Android, which sqlite3 would try by default.
+      // Explicitly tell it about the correct temporary directory.
+      sqlite3.tempDirectory = cachebase;
+
+      return NativeDatabase.memory();
+    }),
+  );
+}