Ask HN: Is there a datastructure for leaderboards with filtering and timeslices?

I built a variation of B+Tree to track leaderboard rankings and it works similar to Redis Z functions (zadd/zrange).

Now I'm trying to think of a solution to filter by country code or some other player attribute. In addition, I also want to dynamically create timeslices so I can show leaderboard rankings that occurred between time A and time B.

If I were to implement the filter or timeslices into my B+Tree, I'd have to basically scan from the first record down to the last by checking against player attributes and/or the timestamp of when ranking was inserted.

The goal is to have 1 leaderboard index per stat, rather than X leaderboard per stat.

Is it feasible, or should I just create a new leaderboard index for every combination of attribute / timeslice?