Use table truncate() instead of raw DELETE for idempotent seed

Author: dereuromark

config/Seeds/CountriesSeed.php

@@ -37,9 +37,8 @@ public function run(): void {
 		}
 		fclose($handle);
 
-		$this->execute('DELETE FROM countries');
-
 		$table = $this->table('countries');
+		$table->truncate();
 		$table->insert($rows)->save();
 	}