feat: DIA-957: Delete predictions when ModelVersion updated or ModelR… (

#5719)

…un deleted

### PR fulfills these requirements
- [ ] Commit message(s) and PR title follows the format
`[fix|feat|ci|chore|doc]: TICKET-ID: Short description of change made`
ex. `fix: DEV-XXXX: Removed inconsistent code usage causing intermittent
errors`
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fixes/features)
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coherent (checked for spelling/grammatical errors, commented out code,
debug logs etc.)
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fixes/features)



#### Change has impacts in these area(s)
_(check all that apply)_
- [ ] Product design
- [ ] Backend (Database)
- [ ] Backend (API)
- [ ] Frontend



### Describe the reason for change
_(link to issue, supportive screenshots etc.)_



#### What does this fix?
_(if this is a bug fix)_



#### What is the new behavior?
_(if this is a breaking or feature change)_



#### What is the current behavior?
_(if this is a breaking or feature change)_



#### What libraries were added/updated?
_(list all with version changes)_



#### Does this change affect performance?
_(if so describe the impacts positive or negative)_



#### Does this change affect security?
_(if so describe the impacts positive or negative)_



#### What alternative approaches were there?
_(briefly list any if applicable)_



#### What feature flags were used to cover this change?
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### Does this PR introduce a breaking change?
_(check only one)_
- [ ] Yes, and covered entirely by feature flag(s)
- [ ] Yes, and covered partially by feature flag(s)
- [ ] No
- [ ] Not sure (briefly explain the situation below)



### What level of testing was included in the change?
_(check all that apply)_
- [ ] e2e
- [ ] integration
- [ ] unit



### Which logical domain(s) does this change affect?
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Annotation History, Review Stream etc.)_

label_studio/ml_models/models.py

@@ -7,6 +7,7 @@
 from ml_model_providers.models import ModelProviderConnection
 from projects.models import Project
 from rest_framework.exceptions import ValidationError
+from tasks.models import Prediction
 
 
 def validate_string_list(value):
@@ -54,11 +55,20 @@ class Meta:
 
     parent_model = models.ForeignKey(ModelInterface, related_name='model_versions', on_delete=models.CASCADE)
 
+    prompt = models.TextField(_('prompt'), null=False, blank=False, help_text='Prompt to execute')
+
     @property
     def full_title(self):
         return f'{self.parent_model.title}__{self.title}'
 
-    prompt = models.TextField(_('prompt'), null=False, blank=False, help_text='Prompt to execute')
+    def delete(self, *args, **kwargs):
+        """
+        Deletes Predictions associated with ModelVersion
+        """
+        model_runs = ModelRun.objects.filter(model_version=self.id)
+        for model_run in model_runs:
+            model_run.delete_predictions()
+        super().delete(*args, **kwargs)
 
 
 class ThirdPartyModelVersion(ModelVersion):
@@ -159,3 +169,17 @@ def output_file_name(self):
     @property
     def error_file_name(self):
         return f'{self.project.id}_{self.model_version.pk}_{self.pk}/error.csv'
+
+    def delete_predictions(self):
+        """
+        Deletes any predictions that have originated from a ModelRun
+        """
+
+        Prediction.objects.filter(model_run=self.id).delete()
+
+    def delete(self, *args, **kwargs):
+        """
+        Deletes Predictions associated with ModelRun
+        """
+        self.delete_predictions()
+        super().delete(*args, **kwargs)