🚨 Warning: This pull request contains Frontend and Backend changes!

It's discouraged to make changes to Sentry's Frontend and Backend in a single pull request. The Frontend and Backend are not atomically deployed. If the changes are interdependent of each other, they must be separated into two pull requests and be made forward or backwards compatible, such that the Backend or Frontend can be safely deployed independently.

Have questions? Please ask in the #discuss-dev-infra channel.

Unless the Issues team has any objections, we could get this PR merged as-is, however, I want to see the endpoint take the provider name as a follow-up. Doing so will be the grounds for auto-adding repositories and determining the default branch for new repositories.

This would greatly improve the user experience for this endpoint.

--- a/src/sentry/integrations/api/endpoints/organization_code_mappings_bulk.py
+++ b/src/sentry/integrations/api/endpoints/organization_code_mappings_bulk.py
@@ -42,6 +42,7 @@ class MappingItemSerializer(serializers.Serializer):
 class BulkCodeMappingsRequestSerializer(CamelSnakeSerializer):
     project = serializers.CharField(required=True)
     repository = serializers.CharField(required=True)
+    provider = serializers.CharField(required=False, allow_null=True, allow_blank=True)
     default_branch = serializers.RegexField(
         r"^(^(?![\/]))([\w\.\/-]+)(?<![\/])$",
         required=False,
@@ -94,25 +95,30 @@ class OrganizationCodeMappingsBulkEndpoint(OrganizationEndpoint):
                 status=status.HTTP_403_FORBIDDEN,
             )
 
-        # Resolve repository by name
-        try:
-            repo = Repository.objects.get(
-                organization_id=organization.id,
-                name=data["repository"],
-                status=ObjectStatus.ACTIVE,
-            )
-        except Repository.DoesNotExist:
+        # Resolve repository by name (and optionally provider when multiple repos share a name)
+        repo_filter = Repository.objects.filter(
+            organization_id=organization.id,
+            name=data["repository"],
+            status=ObjectStatus.ACTIVE,
+        )
+        provider = (data.get("provider") or "").strip()
+        if provider:
+            # Match both "github" and "integrations:github" (how integration repos are stored)
+            repo_filter = repo_filter.filter(provider__in=[provider, f"integrations:{provider}"])
+        repos = list(repo_filter)
+        if len(repos) == 0:
             return Response(
                 {"detail": f"Repository not found: {data['repository']}"},
                 status=status.HTTP_404_NOT_FOUND,
             )
-        except Repository.MultipleObjectsReturned:
+        if len(repos) > 1:
             return Response(
                 {
-                    "detail": f"Multiple repositories found with name: {data['repository']}. Please ensure repository names are unique."
+                    "detail": f"Multiple repositories found with name: {data['repository']}. Provide provider (e.g. 'github', 'gitlab') to specify which integration's:

thanks for the suggestions! Added it in this PR too as well as inferring the branch name and creating a new repo if it doesn't exist