Agree upon database columns to be converted and added to the RAG vector search DB. #cba_llm

[aaronkaplan]

• [X] agree upon which DB colums/tables need to be converted
• [x] cross check with @claireschlamm that this is correct and sufficient for our x-language search

[aaronkaplan]

• [x] get the confirmation from @claireschlamm which columns to really export.
• [x] cross check with @claireschlamm the quality a bit
• [x] estimate the number of tokens for that (final check)
• [ ]