improved tab & topic handling

app/lib/features/topics/data/database/daos/tab.dart

@@ -8,11 +8,42 @@ part 'tab.g.dart';
 class TabDao extends DatabaseAccessor<TabDatabase> with _$TabDaoMixin {
   TabDao(super.db);
 
-  Future<void> upsertTab(ITab tab) {
+  Stream<List<TabData>> watchTabs() {
+    return (db.tab.select()..orderBy([(u) => OrderingTerm.asc(u.id)])).watch();
+  }
+
+  Stream<TabData?> watchTab(String tabId) {
+    return (db.tab.select()..where((t) => t.id.equals(tabId)))
+        .watchSingleOrNull();
+  }
+
+  Stream<bool> watchTabExisiting(String tabId) {
+    final existsStatement =
+        existsQuery(db.tab.select()..where((t) => t.id.equals(tabId)));
+
+    return selectExpressions([existsStatement])
+        .map((row) => row.read(existsStatement)!)
+        .watchSingle();
+  }
+
+  Stream<List<String>> watchTopicTabs(String? topicId) {
+    final query = (selectOnly(db.tab)
+      ..addColumns([db.tab.id])
+      ..where(
+        (topicId == null)
+            ? db.tab.topicId.isNull()
+            : db.tab.topicId.equals(topicId),
+      )
+      ..orderBy([OrderingTerm.asc(db.tab.id)]));
+
+    return query.map((row) => row.read(db.tab.id)!).watch();
+  }
+
+  Future<void> upsertTab(ITab tab, DateTime timestamp) {
     return db.tab.insertOne(
       TabCompanion.insert(
         id: tab.id,
-        timestamp: DateTime.now(),
+        timestamp: timestamp,
         url: tab.url,
         topicId: Value(tab.topicId),
         title: Value(tab.title),
@@ -24,6 +55,7 @@ class TabDao extends DatabaseAccessor<TabDatabase> with _$TabDaoMixin {
 
   Future<void> updateTab(
     String id, {
+    required DateTime timestamp,
     Value<Uri> url = const Value.absent(),
     Value<String?> title = const Value.absent(),
     Value<String?> topicId = const Value.absent(),
@@ -33,7 +65,7 @@ class TabDao extends DatabaseAccessor<TabDatabase> with _$TabDaoMixin {
 
     return statement.write(
       TabCompanion(
-        timestamp: Value(DateTime.now()),
+        timestamp: Value(timestamp),
         url: url,
         title: title,
         topicId: topicId,
@@ -41,4 +73,18 @@ class TabDao extends DatabaseAccessor<TabDatabase> with _$TabDaoMixin {
       ),
     );
   }
+
+  Future<void> deleteTab(String id) {
+    return db.tab.deleteOne(TabCompanion.custom(id: Variable(id)));
+  }
+
+  Future<void> deleteTopicTabs(String? topicId) {
+    return (db.tab.delete()
+          ..where(
+            (t) => (topicId == null)
+                ? t.topicId.isNull()
+                : t.topicId.equals(topicId),
+          ))
+        .go();
+  }
 }

app/lib/features/topics/data/database/daos/topic.dart

@@ -3,6 +3,7 @@ import 'dart:ui';
 import 'package:drift/drift.dart';
 import 'package:lensai/core/uuid.dart';
 import 'package:lensai/features/topics/data/database/database.dart';
+import 'package:lensai/features/topics/data/models/topic_data.dart';
 
 part 'topic.g.dart';