🐛(drafts) fix concurrent updates of drafts with blob delete

.gitignore

@@ -47,6 +47,7 @@ env.d/terraform
 # npm
 node_modules
 src/frontend/out/
+tsconfig.tsbuildinfo
 
 # Mails
 src/backend/core/templates/mail/

Makefile

@@ -156,10 +156,18 @@ lint: ## run all linters
 lint: \
   back-lint \
   front-lint \
+  front-ts-check \
   mta-in-lint \
   mta-out-lint
 .PHONY: lint
 
+lint-check:  ## run all linters in check mode
+lint-check: \
+  back-ruff-check \
+  back-pylint \
+  front-ts-check
+.PHONY: lint-check
+
 back-lint: ## run back-end linters
 back-lint: \
   back-ruff-format \

src/backend/core/api/viewsets/draft.py

@@ -253,8 +253,12 @@ class DraftMessageView(APIView):
 
         # Update draft body if provided
         if "draftBody" in request_data:
-            if message.draft_blob:
-                message.draft_blob.delete()
+
+            try:
+                if message.draft_blob:
+                    message.draft_blob.delete()
+            except models.Blob.DoesNotExist:
+                pass
             message.draft_blob = self.mailbox.create_blob(
                 content=(request_data.get("draftBody") or "").encode("utf-8"),
                 content_type="application/json",
@@ -468,7 +472,7 @@ class DraftMessageView(APIView):
         try:
             # Fetch the draft message, ensuring it belongs to the user indirectly via ThreadAccess
             # and matches the sender mailbox context if that's a requirement for *updating*.
-            message = models.Message.objects.select_related("thread").get(
+            message = models.Message.objects.select_related("thread", "draft_blob").get(
                 id=message_id,
                 is_draft=True,
                 # Ensure the user has access to this thread