Delete old duckdb index files

default/all_docs/index.duckdb

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default/all_docs_eval/index.duckdb

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-size 18624512

default/eval_ic_qa/index.duckdb

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default/eval_qa/index.duckdb

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default/eval_recite_qa/index.duckdb

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-oid sha256:1f52bfefa12e6687ea06c779a53c955f13e785fab28890f8b065ad34e29e5d25
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default/train/index.duckdb

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default/train_ic_qa/index.duckdb

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default/train_qa/index.duckdb

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default/train_recite_qa/index.duckdb

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default/validation/index.duckdb

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