fix(server): prevent deleting last user in the tenant

packages/server/src/services/Users/SyncTenantUserDeleted.ts

@@ -0,0 +1,26 @@
+import events from '@/subscribers/events';
+import { ITenantUserDeletedPayload } from '@/interfaces';
+import { SystemUser } from '@/system/models';
+
+export class SyncTenantUserDelete {
+  /**
+   * Attaches events with handlers.
+   * @param bus
+   */
+  public attach(bus) {
+    bus.subscribe(
+      events.tenantUser.onDeleted,
+      this.syncSystemUserOnceUserDeleted
+    );
+  }
+
+  /**
+   * Deletes the system user once tenant user be deleted.
+   * @param {ITenantUserDeletedPayload} payload -
+   */
+  private syncSystemUserOnceUserDeleted = async ({
+    tenantUser,
+  }: ITenantUserDeletedPayload) => {
+    await SystemUser.query().where('id', tenantUser.systemUserId).delete();
+  };
+}