UPDATE

Modules/Backend/account/models.py

@@ -0,0 +1,37 @@
+from django.contrib.auth.models import AbstractUser
+from django.contrib.auth.models import UserManager as BaseUserManager
+from django.db.models import Q
+from django.db import models
+
+
+class CustomUserManager(BaseUserManager):
+    """Manager that allows lookup by username, email, or phone_number."""
+
+    def get_by_natural_key(self, username):
+        return self.get(
+            Q(username=username) | Q(email=username) | Q(phone_number=username)
+        )
+
+
+class User(AbstractUser):
+    phone_number = models.CharField(
+        max_length=32,
+        unique=True,
+        db_index=True,
+    )
+    email = models.EmailField(
+        "email address",
+        unique=True,
+        db_index=True,
+    )
+
+    USERNAME_FIELD = "username"
+    REQUIRED_FIELDS = ["email", "phone_number"]
+
+    objects = CustomUserManager()
+
+    class Meta:
+        db_table = "users"
+
+    def __str__(self):
+        return self.username