Let a queued message be taken back into the composer

internal/store/taskinputs.go

@@ -26,15 +26,36 @@ func (s *Store) AddTaskInput(ctx context.Context, in TaskInput, projectID, sessi
 		payload["images"] = in.Images
 	}
 	return s.write(ctx, func(tx *sql.Tx, emit emitFunc) error {
-		_, err := tx.ExecContext(ctx, `INSERT INTO task_inputs (task_id, actor, text, images, created_at) VALUES (?, ?, ?, ?, ?)`,
+		res, err := tx.ExecContext(ctx, `INSERT INTO task_inputs (task_id, actor, text, images, created_at) VALUES (?, ?, ?, ?, ?)`,
 			in.TaskID, in.Actor, in.Text, string(images), now())
 		if err != nil {
 			return err
 		}
+		payload["id"], err = res.LastInsertId()
+		if err != nil {
+			return err
+		}
 		return emit(sessionEvent("user.queued", projectID, in.TaskID, "", sessionID, in.Actor, payload))
 	})
 }
 
+func (s *Store) WithdrawTaskInput(ctx context.Context, taskID string, id int64, projectID, sessionID, actor string) error {
+	return s.write(ctx, func(tx *sql.Tx, emit emitFunc) error {
+		res, err := tx.ExecContext(ctx, `DELETE FROM task_inputs WHERE id = ? AND task_id = ?`, id, taskID)
+		if err != nil {
+			return err
+		}
+		n, err := res.RowsAffected()
+		if err != nil {
+			return err
+		}
+		if n == 0 {
+			return ErrNotFound
+		}
+		return emit(sessionEvent("user.unqueued", projectID, taskID, "", sessionID, actor, map[string]any{"id": id}))
+	})
+}
+
 func (s *Store) TaskInputs(ctx context.Context, taskID string) ([]TaskInput, error) {
 	rows, err := s.db.QueryContext(ctx, `SELECT id, task_id, actor, text, images, created_at FROM task_inputs WHERE task_id = ? ORDER BY id`, taskID)
 	if err != nil {