added api/history

api/models.py

@@ -1,6 +1,6 @@
 import uuid
 from django.db import models
-
+from django.contrib.auth import get_user_model
 class User(models.Model):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
 
@@ -11,10 +11,10 @@ class Prediction(models.Model):
     result = models.JSONField()
     deleted_at = models.DateTimeField(null=True, blank=True)
 
-class UserPrediction(models.Model):
-    user = models.ForeignKey(User, on_delete=models.CASCADE)
-    prediction = models.ForeignKey(Prediction, on_delete=models.CASCADE)
-    created_at = models.DateTimeField(auto_now_add=True)
 
-    class Meta:
-        unique_together = ('user', 'prediction')
+
+class UserPrediction(models.Model):
+    user = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
+    prediction = models.ForeignKey("Prediction", on_delete=models.CASCADE)
+    created_at = models.DateTimeField()
+