Ambiguous field names in response of requrest_tools.py push

[NickVolynkin]

On the market there's a statement with key 93843771:

    {
        "_key": "93843771",
        "createdOn": 1689098910158,
        "description": "description",
        "input_description": "input_description",
        "isPrivate": false,
        "name": "nickvolynkin_example_circuit",
        "sender": "nickvolynkin",
        "type": "placeholder-zkllvm",
        "updatedOn": 1689098910158,
        "url": "url"
    }

Pushing a proof proposal for this statement:

/proof-market-toolchain# python3 scripts/request_tools.py push --cost 2 --file /opt/zkllvm-template/src/main-input.json --key 93843771

returns the following data:

{
    "_key": "93846511",
    "statement_key": "93843771",
    "cost": 2,
    "sender": "nickvolynkin",
    "status": "created"
}

It's unclear what the _key is. Must be the proposal's ID.