diff --git a/application/config/migration.php b/application/config/migration.php
index b334c6b80..bd90bbc19 100644
--- a/application/config/migration.php
+++ b/application/config/migration.php
@@ -22,7 +22,7 @@ $config['migration_enabled'] = TRUE;
 |
 */
 
-$config['migration_version'] = 251;
+$config['migration_version'] = 252;
 
 /*
 |--------------------------------------------------------------------------
diff --git a/application/migrations/252_add_oqrs_cascade.php b/application/migrations/252_add_oqrs_cascade.php
new file mode 100644
index 000000000..f0823119e
--- /dev/null
+++ b/application/migrations/252_add_oqrs_cascade.php
@@ -0,0 +1,25 @@
+<?php
+
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+class Migration_add_oqrs_cascade extends CI_Migration {
+
+	public function up() {
+			$this->dbtry("ALTER TABLE oqrs MODIFY COLUMN qsoid BIGINT(20) UNSIGNED;");
+			$this->dbtry("ALTER TABLE oqrs ADD UNIQUE (qsoid)");
+			$this->dbtry("ALTER TABLE oqrs ADD CONSTRAINT oqrs_logbook_fk FOREIGN KEY (qsoid) REFERENCES " . $this->config->item('table_name') . " (COL_PRIMARY_KEY) ON DELETE CASCADE ON UPDATE RESTRICT;");
+	}
+
+	public function down(){
+			$this->dbtry("ALTER TABLE oqrs MODIFY COLUMN qsoid INT;");
+			$this->dbtry("ALTER TABLE oqrs DROP UNIQUE (qsoid);");
+			$this->dbtry("ALTER TABLE oqrs DROP FOREIGN KEY oqrs_logbook_fk;");
+	}
+	function dbtry($what) {
+		try {
+			$this->db->query($what);
+		} catch (Exception $e) {
+			log_message("error", "Something gone wrong while altering FKs: ".$e." // Executing: ".$this->db->last_query());
+		}
+	}
+}