OptimizationStep

{
    "rank": 0,
    "songId": 0,
    "title": "string",
    "difficulty": "string",
    "difficultyLevel": 0,
    "fromBpi": 0,
    "toBpi": 0,
    "fromExScore": 0,
    "toExScore": 0,
    "exScoreGap": 0,
    "bpiGain": 0,
    "cumulativeTotalBpi": 0,
    "isUnplayed": true,
    "radarCategory": "NOTES",
    "isRadarStrength": true
}