fix last comma error

handlers/responsible.go

@@ -14,7 +14,7 @@ func (dh *DatabaseHandler) CreateNewResponsibleTable() error {
 	CREATE TABLE IF NOT EXISTS responsible (
 		id INTEGER PRIMARY KEY AUTOINCREMENT,
 		first_name TEXT NOT NULL,
-		last_name TEXT UNIQUE NOT NULL,
+		last_name TEXT UNIQUE NOT NULL
 	);`
 
 	_, err := dh.database.Exec(createTableSQL)