feat(database): Add trigger to set impersonation on first user

Introduced a trigger to automatically set `canImpersonate` to true for the first user inserted into the `core.user` table. The trigger is removed after the first user is added to ensure this behavior only applies to the initial user. Includes both the creation and rollback logic for the migration.

packages/twenty-server/src/database/typeorm/core/migrations/common/1734950137596-add-trigger-to-update-can-impersonate-on-first-user.ts

@@ -0,0 +1,44 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class AddTriggerToUpdateCanImpersonateOnFirstUser1734950137596
+  implements MigrationInterface
+{
+  name = 'AddTriggerToUpdateCanImpersonateOnFirstUser1734950137596';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    queryRunner.query(`
+CREATE OR REPLACE FUNCTION set_can_impersonate_to_true_on_first_user()
+    RETURNS TRIGGER AS $$
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM core."user") THEN
+        NEW."canImpersonate" := true;
+        PERFORM delete_first_user_trigger();
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+`);
+    queryRunner.query(`
+CREATE TRIGGER insert_user_trigger
+    BEFORE INSERT ON core."user"
+    FOR EACH ROW
+EXECUTE FUNCTION set_can_impersonate_to_true_on_first_user();
+`);
+    queryRunner.query(`
+CREATE OR REPLACE FUNCTION delete_first_user_trigger()
+    RETURNS void AS $$
+BEGIN
+    EXECUTE 'DROP TRIGGER IF EXISTS insert_user_trigger ON core.user';
+END;
+$$ LANGUAGE plpgsql;
+`);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    queryRunner.query(`
+DROP TRIGGER IF EXISTS insert_user_trigger ON core."user";
+DROP FUNCTION IF EXISTS set_can_impersonate_to_true_on_first_user();
+DROP FUNCTION IF EXISTS delete_first_user_trigger();
+`);
+  }
+}