feat: Created task lists that work in categories

backend/internal/infrastructure/database/database.go

@@ -16,6 +16,7 @@ type Database struct {
 	MembershipRepo  *MembershipRepository
 	NoteRepo        *NoteRepository
 	CategoryRepo    *CategoryRepository
+	TaskListRepo    *TaskListRepository
 	TaskRepo        *TaskRepository
 	TaskStatusRepo  *TaskStatusRepository
 	RevisionRepo    *NoteRevisionRepository
@@ -49,6 +50,7 @@ func NewDatabase(ctx context.Context, mongoURL string) (*Database, error) {
 		MembershipRepo:  NewMembershipRepository(db),
 		NoteRepo:        NewNoteRepository(db),
 		CategoryRepo:    NewCategoryRepository(db),
+		TaskListRepo:    NewTaskListRepository(db),
 		TaskRepo:        NewTaskRepository(db),
 		TaskStatusRepo:  NewTaskStatusRepository(db),
 		RevisionRepo:    NewNoteRevisionRepository(db),
@@ -87,6 +89,9 @@ func (d *Database) EnsureIndexes(ctx context.Context) error {
 	if err := d.TaskRepo.EnsureIndexes(ctx); err != nil {
 		return err
 	}
+	if err := d.TaskListRepo.EnsureIndexes(ctx); err != nil {
+		return err
+	}
 	if err := d.TaskStatusRepo.EnsureIndexes(ctx); err != nil {
 		return err
 	}

backend/internal/infrastructure/database/task_repository.go

@@ -108,13 +108,95 @@ func (r *TaskRepository) EnsureIndexes(ctx context.Context) error {
 	_, err := r.collection.Indexes().CreateMany(ctx, []mongo.IndexModel{
 		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "updated_at", Value: -1}}},
 		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "status_id", Value: 1}}},
-		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "category_id", Value: 1}}},
+		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "task_list_id", Value: 1}}},
 		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "parent_task_id", Value: 1}}},
 		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "note_links", Value: 1}}},
 	})
 	return err
 }
 
+// TaskListRepository implements task list data access.
+type TaskListRepository struct {
+	collection *mongo.Collection
+}
+
+// NewTaskListRepository creates a new task list repository.
+func NewTaskListRepository(db *mongo.Database) *TaskListRepository {
+	return &TaskListRepository{collection: db.Collection("task_lists")}
+}
+
+func (r *TaskListRepository) CreateTaskList(ctx context.Context, list *entities.TaskList) error {
+	list.ID = bson.NewObjectID()
+	list.CreatedAt = time.Now()
+	list.UpdatedAt = time.Now()
+	_, err := r.collection.InsertOne(ctx, list)
+	return err
+}
+
+func (r *TaskListRepository) GetTaskListByID(ctx context.Context, id bson.ObjectID) (*entities.TaskList, error) {
+	var list entities.TaskList
+	err := r.collection.FindOne(ctx, bson.M{"_id": id}).Decode(&list)
+	if err != nil {
+		if err == mongo.ErrNoDocuments {
+			return nil, errors.New("task list not found")
+		}
+		return nil, err
+	}
+	return &list, nil
+}
+
+func (r *TaskListRepository) ListTaskLists(ctx context.Context, spaceID bson.ObjectID) ([]*entities.TaskList, error) {
+	cursor, err := r.collection.Find(ctx, bson.M{"space_id": spaceID}, options.Find().SetSort(bson.D{{Key: "name", Value: 1}}))
+	if err != nil {
+		return nil, err
+	}
+	defer cursor.Close(ctx)
+
+	var lists []*entities.TaskList
+	if err := cursor.All(ctx, &lists); err != nil {
+		return nil, err
+	}
+	return lists, nil
+}
+
+func (r *TaskListRepository) ListTaskListsByCategory(ctx context.Context, spaceID bson.ObjectID, categoryID bson.ObjectID) ([]*entities.TaskList, error) {
+	cursor, err := r.collection.Find(ctx, bson.M{"space_id": spaceID, "category_id": categoryID}, options.Find().SetSort(bson.D{{Key: "name", Value: 1}}))
+	if err != nil {
+		return nil, err
+	}
+	defer cursor.Close(ctx)
+
+	var lists []*entities.TaskList
+	if err := cursor.All(ctx, &lists); err != nil {
+		return nil, err
+	}
+	return lists, nil
+}
+
+func (r *TaskListRepository) UpdateTaskList(ctx context.Context, list *entities.TaskList) error {
+	list.UpdatedAt = time.Now()
+	_, err := r.collection.ReplaceOne(ctx, bson.M{"_id": list.ID}, list)
+	return err
+}
+
+func (r *TaskListRepository) DeleteTaskList(ctx context.Context, id bson.ObjectID) error {
+	_, err := r.collection.DeleteOne(ctx, bson.M{"_id": id})
+	return err
+}
+
+func (r *TaskListRepository) DeleteTaskListsBySpaceID(ctx context.Context, spaceID bson.ObjectID) error {
+	_, err := r.collection.DeleteMany(ctx, bson.M{"space_id": spaceID})
+	return err
+}
+
+func (r *TaskListRepository) EnsureIndexes(ctx context.Context) error {
+	_, err := r.collection.Indexes().CreateMany(ctx, []mongo.IndexModel{
+		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "name", Value: 1}}, Options: options.Index().SetUnique(true)},
+		{Keys: bson.D{{Key: "space_id", Value: 1}, {Key: "category_id", Value: 1}}},
+	})
+	return err
+}
+
 // TaskStatusRepository implements task status data access.
 type TaskStatusRepository struct {
 	collection *mongo.Collection