How are multiple range queries implemented in CouchDB? For a single range condition, startkey and endkey combination works fine, but the same thing is not working with a mu
You're using arrays as your keys. Couchdb will compare arrays by comparing each array element in increasing order until two element are not equal.
E.g. to compare [1,'a',5] and [1,'c',0] it will compare 1 whith 1, then 'a' with 'c' and will decide that [1,'a',5] is less than [1,'a',0]
This explains why your range key query fails:
["7446567e45dc5155353736cb3d6041c0",nil,5,30000] is greater ["7446567e45dc5155353736cb3d6041c0",nil,5,90000]