Remove duplicate email cleanup logic and add unique constraint to user email

src/db/migrations/1761032305682-AddUniqueConstraintToUserEmail.ts

@@ -4,18 +4,7 @@ export class AddUniqueConstraintToUserEmail1761032305682 implements MigrationInt
     name = 'AddUniqueConstraintToUserEmail1761032305682'
 
     public async up(queryRunner: QueryRunner): Promise<void> {
-        // Clean up duplicate emails - keep the oldest record (MIN id)
-        await queryRunner.query(`
-            DELETE FROM users
-            WHERE id IN (
-                SELECT u1.id
-                FROM users u1
-                INNER JOIN users u2 ON u1.email = u2.email AND u1.id > u2.id
-                WHERE u1.email IS NOT NULL
-            )
-        `);
-        
-        // Add unique constraint
+
         await queryRunner.query(`ALTER TABLE "users" ADD CONSTRAINT "UQ_97672ac88f789774dd47f7c8be3" UNIQUE ("email")`);
     }