added DR update API

src/doctors/doctors.service.ts

@@ -72,11 +72,6 @@ export class DoctorsService {
       );
     }
 
-    //in DB Unique key constraints for registration_no. Will throw error if body has duplicate registration_no 
-    if (existingDoctor?.registration_no == doctorRegNo) {
-      throw new AppException(`Duplicate registration number found.`, '409');
-    }
-
     // Deactivate the old doctor record
     await this.prisma.doctor_master.update({
       where: { id: doctorId },