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api/hooks/medialib/delete_return.js

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+;(function () {
+    const request = context.request()
+    //get id of deleted image entry (delete request URL is : .../api/_/demo/medialib/id)
+    const id = request.param("id")
+
+    //find all entrys where there is an image field with the id of this deleted one (image is an foreignKey widget, so stores the id as a string internally)
+    const referencingElements = context.db.find("democol", {
+        filter: {
+            image: id,
+        },
+    })
+    referencingElements.forEach((e) => {
+        //update all those entries to remove the image id from them, since its deleted...
+        context.db.update("democol", e.id, {
+            image: "",
+        })
+    })
+})()