use false instead of 0

createDatabase.sql

@@ -135,7 +135,7 @@ CREATE TABLE IF NOT EXISTS transfer
 (
 	id INT NOT NULL AUTO_INCREMENT,
 	id_received INT NOT NULL,
-	progress BOOLEAN NOT NULL DEFAULT 0,
+	progress BOOLEAN NOT NULL DEFAULT FALSE,
 	PRIMARY KEY (id),
 	FOREIGN KEY (id_received) REFERENCES received (id) ON DELETE CASCADE ON UPDATE CASCADE
 );