Below is a dialogue between software developers, the first one used ChatGPT in his solution of code task and makes a comment,   the second one gives him reply on his solution. Write a reply that appropriately answers the comment.

### Comment:
ran an experiment here if one of the columns in a compound primary key can contain null, its possible for two rows to have the same primary key.i really dont like that.one solution the database migrations could populate the strategies table with an initial row with id  which represents no chunking  then all of the rows in embeddings could reference that and avoid nulls.### Reply:
what about storing the actual locationextent of the chunk content region within the document along with the strategy in addition to or even instead of an index? that way, you could retrieve the content for rag purposes after checking the checksum is still valid.p.s. originally wanted to ask about potential rag support before i noticed that you are actually planning to implement this anyway  great to hear! would love to see some pdf or other format preprocessing as well, e.g. for layoutaware content extraction, particularly for scientific papers, but maybe that could be separate tools, although there might be some relevant interaction with chunking there.