added action orm models and route

admin/urls.py

@@ -10,4 +10,5 @@ urlpatterns = [
     path("users/edit/<int:pk>", views.EditUserView.as_view(), name="edit_user"),
     path("users/delete/<int:pk>", views.DeleteUserView.as_view(), name="delete_user"),
     path("institution/<int:pk>", views.InstitutionView.as_view(), name="institution"),
+    path("reserved", views.AddReservedAnnotationView.as_view(), name="reserved"),
 ]

evidence/models.py

@@ -15,6 +15,7 @@ class Annotation(models.Model):
         USER = 1, "User"
         DOCUMENT = 2, "Document"
         ERASE_SERVER = 3, "EraseServer"
+        ADMIN = 4, "Admin"
 
     created = models.DateTimeField(auto_now_add=True)
     uuid = models.UUIDField()
@@ -28,7 +29,32 @@ class Annotation(models.Model):
         constraints = [
             models.UniqueConstraint(fields=["type", "key", "uuid"], name="unique_type_key_uuid")
         ]
+    #TODO: check if this works properly
+    def clean(self):
+        super().clean()
+        if self.type == self.Type.ADMIN:
+            if Annotation.objects.filter(type=self.Type.ADMIN, key=self.key).exists():
+                raise ValidationError(f"The key '{self.key}' is already reserved by admin.")
+            else:
+                if Annotation.objects.filter(type=self.Type.ADMIN, key=self.key).exists():
+                    raise ValidationError(f"The key '{self.key}' is reserved by admin and cannot be used.")
 
+class AllowedValue(models.Model):
+    annotation = models.ForeignKey(Annotation, on_delete=models.CASCADE, limit_choices_to={'type': Annotation.Type.ADMIN})
+    value = models.CharField(max_length=50)
+
+
+    def __str__(self):
+        return self.value
+
+#This represents a change on a System-type Annotation
+class Action(models.Model):
+
+    annotation = models.ForeignKey(Annotation, on_delete=models.CASCADE, limit_choices_to={'type': Annotation.Type.ADMIN})
+    created = models.DateTimeField(auto_now_add=True)
+    owner = models.ForeignKey(Institution, on_delete=models.CASCADE)
+    user = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, blank=True)
+    comment = models.CharField(max_length=250)
 
 class Evidence:
     def __init__(self, uuid):