[Bug]: Updating index twice will result in a ValueError

[masies]

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• I have searched the existing issues and this bug is not already filed.
• My model is hosted on OpenAI or Azure. If not, please look at the "model providers" issue and don't file a new one here.
• I believe this is a legitimate bug, not just a question. If this is a question, please use the Discussions area.

Describe the bug

Running update_output twice throws
ValueError: Could not find update_output/YYYYMMDD-HHMMSS/delta/communities.parquet in storage!

this issue is related to here

key = self._keyname(key) becomes (in my case) 'output\update_output\YYYYMMDD-HHMMSS\delta\communities.parquet'
I guess this is because of the logic from the previous version

Steps to reproduce

1. init the graphrag root dir,
2. create the index
3. add a file and update the index
4. add another file and update the index

Expected Behavior

it should update normally the index once again, with both documents added in step 3 and 4 present in the index

GraphRAG Config Used

...
update_index_output:
    type: blob 
    provider: azure
    storage_account_blob_url: ${BLOB_STORAGE_URL}
    container_name: ${ROOT_DIR}
    base_dir: "update_output"
...

Logs and screenshots

No response

Additional Information

• GraphRAG Version: 2.1.0
• Operating System: win 11
• Python Version: 3.14
• Related Issues:

[xiao-hf]

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