step3/api/QuestionsApi/Models/RatingModels.cs

using MongoDB.Bson;
using MongoDB.Bson.Serialization.Attributes;

namespace QuestionsApi.Models;

public class UserRating
{
    [BsonId]
    [BsonRepresentation(BsonType.ObjectId)]
    public string? Id { get; set; }

    public string UserId { get; set; } = "";
    public int OverallElo { get; set; } = 1000;
    public Dictionary<string, int> CategoryElos { get; set; } = [];
    public int RatedQuestionCount { get; set; }
    public int? HistoryBaselineElo { get; set; }
    public DateTime? HistoryStartedUtc { get; set; }
    public DateTime UpdatedUtc { get; set; } = DateTime.UtcNow;
}

public class QuestionRating
{
    [BsonId]
    [BsonRepresentation(BsonType.ObjectId)]
    public string? Id { get; set; }

    public string QuestionExternalId { get; set; } = "";
    public int Elo { get; set; } = 1000;
    public int AttemptCount { get; set; }
    public DateTime UpdatedUtc { get; set; } = DateTime.UtcNow;
}

public class RatingChangeResponse
{
    public bool Rated { get; set; }
    public string Category { get; set; } = "";
    public int UserOverallElo { get; set; }
    public int UserOverallDelta { get; set; }
    public int UserCategoryElo { get; set; }
    public int UserCategoryDelta { get; set; }
    public int QuestionElo { get; set; }
    public int QuestionEloDelta { get; set; }
}

public class RatingProfileResponse
{
    public int OverallElo { get; set; }
    public int RatedQuestionCount { get; set; }
    public Dictionary<string, int> CategoryElos { get; set; } = [];
    public string Tier { get; set; } = "";
    public int TierDivision { get; set; }
}