Who Quoted, guidance needed

[TomJames]

I'm interested in attempting to make this, however I'd like a couple of pointers to help me on my way. Basically I'm looking to make what I posted over here.

Sadly I'm a little stumped as to what table would be best to query to find out when someone has been quoted, by whom and what the post ID is. I basically want this:

User1 Quotes User2 -> Cron runs every x seconds -> Identifies new quotes -> shows User 2 the last 5 times they've been quoted with direct link to post they were quoted in.


Problem is I have no idea which table, if any would tell me who's quoting who etc.