A backend/src/extensions/users-permissions/content-types/user/lifecycles.ts

@@ -0,0 +1,25 @@ 
+export default {
+  async afterCreate(event) {
+    const { result } = event;
+    if (result.email) {
+      const linkedEvents = await strapi.entityService.findMany(
+        "api::event.event",
+        {
+          filters: { email: result.email },
+          populate: ["users"],
+        }
+      );
+      for (const event of linkedEvents) {
+        strapi.log.info(
+          `Set user ${result.id} (${result.email}) as creator of event ${event.id} (${event.uuid})`
+        );
+        await strapi.entityService.update("api::event.event", event.id, {
+          data: {
+            creator: result.id,
+            users: [...(event.users || []), result.id],
+          },
+        });
+      }
+    }
+  },
+};

M backend/src/index.ts → backend/src/index.ts

@@ -1,5 +1,6 @@ 
 import bootstrapActions from "./bootstrap";
 import graphqlExtends from "./graphql";
+import userLifecycles from "./extensions/users-permissions/content-types/user/lifecycles";
 
 export default {
   /**
@@ -42,5 +43,10 @@ async bootstrap(context) {
     for (let action of bootstrapActions) {
       await action(context);
     }
+
+    strapi.db.lifecycles.subscribe({
+      models: ["plugin::users-permissions.user"],
+      ...userLifecycles,
+    });
   },
 };