Implement DELETE /task/{taskId} (#51)

Close #47

Reviewed-on: #51

backend/db.go

@@ -221,6 +221,21 @@ func (db *Db) GetTask(id int) (Task, error) {
 	return task, nil
 }
 
+func (db *Db) DeleteTask(id int) error {
+	tx, err := db.db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.MustRollback()
+
+	err = tx.Query("delete from tasks where id = ?").Bind(id).Exec()
+	if err != nil {
+		return err
+	}
+
+	return tx.Commit()
+}
+
 func (db *Db) HasTask(id int) (bool, error) {
 	count := 0
 	err := db.db.Query("select count(*) from tasks where id = ?").