Title. Quest doesn't show as available, and doesn't have a turn-in on the map when you pick it up.

Are you sure something else isn't wrong?

[10279] = {"To The Master's Lair",{{20142,},nil,nil,},{{20130,},nil,},66,66,0,nil,{"Speak to Andormu at the Caverns of Time.",},nil,{nil,nil,nil,nil,},nil,nil,nil,nil,nil,nil,1941,nil,nil,nil,nil,10277,136,nil,nil,{{989,0},},},

Starter is 20142 and finisher is 20130 which seems to be correct according to wowhead https://www.wowhead.com/wotlk/quest=10279/to-the-masters-lair

But we'll investigate it

Looks fine to me. Not sure what was going wrong for you, but it's not a data issue.