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engine/services/activity_worker.py:105-126 engine/config.py:632-644 Cache eviction can raise KeyError: ```python sorted_keys = sorted(cache.keys(), key=lambda k: cache[k][1]) for key in sorted_keys[:to_remove]: del cache[key] # Key may already be deleted by cleanup ``` Race: _cleanup_expired_* deletes keys, then sorted() accesses deleted keys. FIX: Guard deletion with 'if key in cache' or snapshot keys before sorting.
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