MT#9763 add key for device_id column

db_scripts/diff/15123.up

@@ -1,3 +1,4 @@
 use kamailio;
 
-alter table mobile_push_registrations add column device_id varbinary(255) not null after subscriber_id;
+alter table mobile_push_registrations add column device_id varbinary(255) not null after subscriber_id,
+  add key (device_id);