Start using solvers contract for being able to determine if user isSolver

[GabrielCamba]

https://etherscan.io/address/0xC92E8bdf79f0507f65a392b0ab4667716BFE0110#code

take a look at how this contract manages solvers and use it to set isSolver property and improve information to indicate if a user was a solver, how many times isSolver flag changed.

[GabrielCamba]

I already worked on this, the progress code is on this branch
That's indexing SolverAdded(address) and SolverRemoved(address) events. Adding and removing the flag isSolver on every user.
Mainnet version is deployed here and gc is deployed here

---

Before removing the previous version of how isSolver is being set, I decided to check everytime a settlement is solved to check if isSolver was set with the newest version. here

I added a redFlag property in User entity to be set every time a settle is solved by a non solver user.

please try this query on gc subgraph that is already indexed:

{ 
  users(first: 5, where: {redFlag: true}) {
    id
    address
    firstTradeTimestamp
    isSolver
    redFlag
    ordersPlaced {
      id
    }
  }  
}

this is the current result:

{
  "data": {
    "users": [
      {
        "id": "0x230ff84887616f29f5c55ce68ff627a29f79d0cc",
        "address": "0x230ff84887616f29f5c55ce68ff627a29f79d0cc",
        "firstTradeTimestamp": 0,
        "isSolver": false,
        "redFlag": true,
        "ordersPlaced": []
      },
      {
        "id": "0x26029b63c7dbd0c4c04d7226c3e7de5eab3db3d8",
        "address": "0x26029b63c7dbd0c4c04d7226c3e7de5eab3db3d8",
        "firstTradeTimestamp": 0,
        "isSolver": false,
        "redFlag": true,
        "ordersPlaced": []
      },
      {
        "id": "0x449944c987d622cd8db9c150fd4ecdfe4435b836",
        "address": "0x449944c987d622cd8db9c150fd4ecdfe4435b836",
        "firstTradeTimestamp": 0,
        "isSolver": false,
        "redFlag": true,
        "ordersPlaced": []
      },
      {
        "id": "0x508bcc23c1a808a9c41d10e2fcb544ffb76ae3e5",
        "address": "0x508bcc23c1a808a9c41d10e2fcb544ffb76ae3e5",
        "firstTradeTimestamp": 0,
        "isSolver": false,
        "redFlag": true,
        "ordersPlaced": []
      },
      {
        "id": "0x52ac5b5e85de9aa72ef5925989fc419aa04eb15b",
        "address": "0x52ac5b5e85de9aa72ef5925989fc419aa04eb15b",
        "firstTradeTimestamp": 0,
        "isSolver": false,
        "redFlag": true,
        "ordersPlaced": []
      }
    ]
  }
}

@alfetopito I'm not sure if this is the expected result or if I miss some event or something. Plz, confirm.