refactored chat archive and added search

app/lib/features/chat_archive/data/database/daos/search.dart

@@ -0,0 +1,49 @@
+import 'package:bang_navigator/features/chat_archive/data/database/database.dart';
+import 'package:drift/drift.dart';
+
+part 'search.g.dart';
+
+@DriftAccessor()
+class SearchDao extends DatabaseAccessor<ChatSearchDatabase>
+    with _$SearchDaoMixin {
+  SearchDao(super.db);
+
+  Future<void> indexChats(Iterable<ChatCompanion> chats) {
+    return db.chat.insertAll(chats);
+  }
+
+  Future<int> deleteAllChats() {
+    return db.chat.deleteAll();
+  }
+
+  Future<int> deleteChat(String fileName) {
+    return (db.chat.delete()..where((t) => t.fileName.equals(fileName))).go();
+  }
+
+  Future<void> upsertChat(ChatCompanion chat) {
+    return db.chat.insertOne(
+      chat,
+      onConflict: DoUpdate(
+        (old) => ChatCompanion.custom(
+          content: Variable(chat.content.value),
+        ),
+      ),
+    );
+  }
+
+  Selectable<ChatQueryResult> queryChats({
+    required String matchPrefix,
+    required String matchSuffix,
+    required String ellipsis,
+    required int snippetLength,
+    required String searchString,
+  }) {
+    return db.chatQuery(
+      query: db.buildQuery(searchString),
+      snippetLength: snippetLength,
+      beforeMatch: matchPrefix,
+      afterMatch: matchSuffix,
+      ellipsis: ellipsis,
+    );
+  }
+}

app/lib/features/chat_archive/data/database/daos/search.g.dart

@@ -0,0 +1,6 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'search.dart';
+
+// ignore_for_file: type=lint
+mixin _$SearchDaoMixin on DatabaseAccessor<ChatSearchDatabase> {}