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Fix blockchain integrity cache advancing before DB commit #518

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Fix blockchain integrity cache advancing before DB commit #518

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71b9acf
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Copilot Mar 8, 2026
59daf4c
Fix blockchain cache race condition: update cache only after successf…
Copilot Mar 8, 2026
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9 changes: 6 additions & 3 deletions backend/routers/issues.py
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Original file line number Diff line number Diff line change
Expand Up @@ -186,9 +186,6 @@ async def create_issue(
hash_content = f"{description}|{category}|{prev_hash}"
integrity_hash = hashlib.sha256(hash_content.encode()).hexdigest()

# Update cache for next report
blockchain_last_hash_cache.set(data=integrity_hash, key="last_hash")

# RAG Retrieval (New)
relevant_rule = rag_service.retrieve(description)
initial_action_plan = None
Expand All @@ -212,10 +209,16 @@ async def create_issue(

# Offload blocking DB operations to threadpool
await run_in_threadpool(save_issue_db, db, new_issue)

# Update cache only after a successful DB commit
blockchain_last_hash_cache.set(data=integrity_hash, key="last_hash")
else:
# Don't create new issue, just return deduplication info
new_issue = None
except Exception as e:
# Invalidate cache so next request re-fetches the true last hash from DB
blockchain_last_hash_cache.invalidate("last_hash")

# Clean up uploaded file if DB save failed
if image_path and os.path.exists(image_path):
try:
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