[chore] Global project refactoring

backend/project/api/notifications/models.py

@@ -0,0 +1,36 @@
+from django.conf import settings
+from django.db import models
+
+
+class NotificationManager(models.Manager):
+    def by_user(self, user_id):
+        return self.get_queryset().filter(
+            user__id=user_id,
+        )
+
+
+class Notification(models.Model):
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name="notifications",
+    )
+    title = models.CharField(
+        max_length=150,
+        null=False,
+    )
+    content = models.TextField(
+        verbose_name="content",
+        null=False,
+    )
+    read = models.BooleanField(
+        default=False,
+    )
+    created_at = models.DateTimeField(
+        auto_now_add=True,
+    )
+
+    objects = NotificationManager()
+
+    def __str__(self):
+        return self.title