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### What problem does this PR solve? When using OceanBase as the document storage engine, parsing and inserting chunks with chunk_data (e.g., table parser row data) fails with the following error: ``` [ERROR][Exception]: Insert chunk error: ['Unconsumed column names: chunk_data'] This happens because the chunk_data column was recently introduced but was omitted from the EXTRA_COLUMNS list in rag/utils/ob_conn.py ``` As a result, the automatic schema migration for existing OceanBase tables does not append the missing chunk_data column, causing the underlying pyobvector or SQLAlchemy to raise an unconsumed column names error during data insertion. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) ### What is the solution? Added column_chunk_data to the EXTRA_COLUMNS list in ``` rag/utils/ob_conn.py ``` This ensures that the OceanBase connection wrapper can correctly detect the missing column and automatically alter existing chunk tables to include the chunk_data field during initialization.