I dont think, its a potential resource hog, but the dirty way to put this as an array in the user table its quicklyer. I think about 4000 user and 15 favorites per user - it can be a big table and I must search for relations in other big tables.
But, maybe I put this in a favorite table, i can put a field of kind in it and I can store favorite post too or or forums.
Your oppions?
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