Track Term last date read

[jzohrab]

Sometimes it's useful to know what status 1 words I've read over the past few days, just because I want to see a list of things I may want to look more into, or prompt chatgpt to make a story. This might be more useful if I can see that a term is a more common one, if there's an accurate index available (#532)

There are a few ways to add this:

• add words.WoLastReadDate, just stamp it when the word shows up on a page marked as read
• add words.WoLastReadTxId, stamp it with the TxID, since the TxID already has the ReadDate
• if a textterms mapping table is implemented (Searching for references should take sentence casing into account #531) this would already be available with a join, though potentially slow if doing a large query
• the right way to do this might be to use a combination of methods: add WoLastReadDate, and also keep track of the TxID somewhere (either in the index table or in words.WoLastReadTxID), since Texts can be deleted

To do:

• choose implementation method
• add tests, when page is marked read the term 'last read date' should be updated
• if a text is deleted, the 'last read date' should not be removed
• add the 'last read date' to the term filters