feat: add endpoint for leaderboards

[wa0x6e]

Following snapshot-labs/snapshot-sequencer#127

Add endpoint to return data from leaderboard table

Test with the query

{
  leaderboards(where: { vote_count_gte: 10, space_in: ["ens.eth"] }) {
    user 
    space 
    votesCount 
    proposalsCount
    lastVote
  }
}

This require that you have run the refresh_leaderboard script from sequencer to populate the table first. user and space can return the full User and Space object.

Leaderboard API is written in order to match the format used in https://api-1.snapshotx.xyz/

Add proposal_count and vote_count to User object

Thanks to the new leaderboard table, we now have access to the total number of votes and proposals created by an user.

{
  user(id: "0xeF8305E140ac520225DAf050e2f71d5fBcC543e7") {
    id 
    votesCount
    proposalsCount
  }
}

Will return

{
  "data": {
    "user": {
      "id": "0xeF8305E140ac520225DAf050e2f71d5fBcC543e7",
      "votesCount": 224,
      "proposalsCount": 217
    }
  }
}

Those 2 new properties have been added to match the User object returned by the SX api

Note

Return properties name are proposalsCount and votesCount for consistency with existing hub API, and not matching the proposal_count and vote_count name on sx

[wa0x6e]

From my tests, the query is taking ~3s, due to the sorting with votesCount DESC, proposalsCount DESC

• Removing all sorting drop the query to 400ms
• Using only one field to sort instead of 2 drop the query to 800ms

Leaderboard is a ranking of top contributors, should be obvious to sort by proposals count if 2 users have the same number of votes, else order will be random

A 3s query should be acceptable, will depend if that scale, as we get more data in the leaderboard table

[wa0x6e]

True that it takes less time, using BINARY casting on only one column.

Still, I just think this PR should be merged only after we resolve the COLLATION issue, and just remove all BINARY casting (and keep the JOIN)

[wa0x6e]

Refactored to remove all BINARY casting, query seems to take 200ms now, as fast as the one without JOIN on the leaderboard

[ChaituVR]

tAck