Update models.py

-from django.db import models
-
-# Create your models here.
-class Item(models.Model):
-    item_id = models.AutoField(primary_key = True)
-    is_folder = models.BooleanField(default = False)
-    name = models.CharField(max_length = 50)
-    file_type = models.CharField(max_length=100, null=True) # signed_url 생성을 위해 file type 세팅
-    path = models.TextField()
-    #parent = models.ForeignKey('Item', on_delete=models.CASCADE, null=True) #related_name
-    parent = models.IntegerField()
-    user_id = models.IntegerField()
-    size = models.IntegerField()
-    is_deleted = models.BooleanField(default = False)
-    created_time = models.DateTimeField(auto_now=True)
-    updated_time = models.DateTimeField(null=True)
-    status = models.BooleanField()
-
-    #file = models.FileField(upload_to = \path)
-    
-    class Meta:
-        ordering = ['item_id']
-
-
-class SharedItem(models.Model):
-    item_id = models.IntegerField()
-    #file_id?
-    expires = models.DateTimeField()
-    password = models.CharField(max_length = 20)
-    created_time = models.DateTimeField(auto_now=True)
-    class Meta:
-        ordering = ['item_id']
-
-
-class User(models.Model):
-    int_id = models.IntegerField()
-    user_id = models.CharField(max_length = 50)
-    name = models.CharField(max_length = 50)
-    password = models.CharField(max_length = 20)
-    total_size = models.IntegerField()
-    current_size = models.IntegerField()
-    created_time = models.DateTimeField(auto_now=True)
-    class Meta:
-        ordering = ['int_id']
+from django.db import models
+
+# Create your models here.
+class Item(models.Model):
+    item_id = models.AutoField(primary_key = True)
+    is_folder = models.BooleanField(default = False)
+    name = models.CharField(max_length = 50)
+    file_type = models.CharField(max_length=100, null=True) # signed_url 생성을 위해 file type 세팅
+    path = models.TextField()
+    #parent = models.ForeignKey('Item', on_delete=models.CASCADE, null=True) #related_name
+    parent = models.IntegerField()
+    user_id = models.IntegerField()
+    size = models.IntegerField()
+    is_deleted = models.BooleanField(default = False)
+    created_time = models.DateTimeField(auto_now=True)
+    updated_time = models.DateTimeField(null=True)
+    status = models.BooleanField()
+
+    #file = models.FileField(upload_to = \path)
+    
+    class Meta:
+        ordering = ['item_id']
+
+
+class SharedItem(models.Model):
+    item_id = models.IntegerField()
+    #file_id?
+    expires = models.DateTimeField()
+    password = models.CharField(max_length = 20)
+    created_time = models.DateTimeField(auto_now=True)
+    class Meta:
+        ordering = ['item_id']
+
+
+class User(models.Model):
+    int_id = models.IntegerField()
+    user_id = models.CharField(max_length = 50)
+    name = models.CharField(max_length = 50)
+    password = models.CharField(max_length = 20)
+    total_size = models.IntegerField()
+    current_size = models.IntegerField()
+    created_time = models.DateTimeField(auto_now=True)
+    class Meta:
+        ordering = ['int_id']