Link the DBML converter in the schema snapshot

Point readers to https://toolbox.dereuromark.de/dbml so they can convert this
DBML snapshot into the migration or raw SQL they need for their own app.

Author: dereuromark

resources/schema/schema.dbml

@@ -4,6 +4,7 @@
 // Hand-maintained: update it when you add a migration that changes these tables.
 // Paste into https://dbdiagram.io (or any DBML tool) to view/diagram.
 // DBML reference: https://dbml.dbdiagram.io/docs
+// Need it as a migration or raw SQL? Convert this DBML at https://toolbox.dereuromark.de/dbml
 
 Project cakephp_queue {
   database_type: 'Generic'