I am searching for a way to stack UUID into a FIFO.

What I need is something like db insert/realm/key/${uuid} or hash insert/realm/key/${uuid} but that I need to keep several uuids with the same realm/key tuple.

The ideal would be:

I first insert realm/key/${uuid1}

then insert real/ley/{uuid2}

then if I do select/realm/key, it pops out ${uuid1)

I can then manually remove it, and the next select will pop out ${uuid2}

I don’t think it’s possible with hash/db, so does anyone a way/trick to achieve that ? 

(the goal is to intercept several simultaneous incoming calls in the RINGING state)

Thank you