add schedule rescheduling

backend/app/Schedule/EloquentScheduleRepository.php

@@ -38,6 +38,39 @@ class EloquentScheduleRepository implements ScheduleRepository
         });
     }
 
+    public function reschedule(RescheduleScheduleDto $dto): Schedule
+    {
+        return DB::transaction(function () use ($dto): Schedule {
+            $model = ScheduleModel::query()
+                ->where('id', $dto->scheduleId)
+                ->where('user_id', $dto->user->getId())
+                ->lockForUpdate()
+                ->first();
+            if ($model === null) {
+                throw new DomainException(
+                    "Schedule with id {$dto->scheduleId} not found",
+                );
+            }
+
+            $model->start_date = $dto->startDate->format('Y-m-d');
+            $model->target_date = $dto->targetDate->format('Y-m-d');
+            $model->save();
+
+            foreach ($dto->assignments as $assignmentDto) {
+                ScheduleAssignmentModel::query()
+                    ->where('id', $assignmentDto->id)
+                    ->where('schedule_id', $dto->scheduleId)
+                    ->whereNull('completed_at')
+                    ->update([
+                        'scheduled_date' => $assignmentDto->scheduledDate
+                            ->format('Y-m-d'),
+                    ]);
+            }
+
+            return $this->toDomain($model, $dto->user);
+        });
+    }
+
     public function findForUser(int $id, User $user): ?Schedule
     {
         $model = ScheduleModel::query()