Some orgnization, and cleanup to come.

RelayServer/Models/Rtc/RtcActiveCall.cs

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+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models.Rtc;
+
+public class RtcActiveCall : Record
+{
+    public required string ChannelId { get; set; }
+    public required string OfferUser { get; set; }
+    public bool IsActive { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+}

RelayServer/Models/Rtc/RtcAnswer.cs

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+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models.Rtc;
+
+public class RtcAnswer : Record
+{
+    public required string ChannelId { get; set; }
+    public required string OfferUser { get; set; }
+    public required string AnswerUser { get; set; }
+    public required string Sdp { get; set; }
+    public DateTime CreatedAt { get; set; }
+}

RelayServer/Models/Rtc/RtcIceCandidate.cs

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+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models.Rtc;
+
+public class RtcIceCandidate : Record
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+    public required string Candidate { get; set; }
+    public string? SdpMid { get; set; }
+    public int? SdpMLineIndex { get; set; }
+    public required string Direction { get; set; } // "offer" or "answer"
+    public DateTime CreatedAt { get; set; }
+}

RelayServer/Models/Rtc/RtcJoinRequest.cs

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+namespace RelayServer.Models.Rtc;
+
+public class RtcJoinRequest
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+}

RelayServer/Models/Rtc/RtcJoinResponse.cs

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+namespace RelayServer.Models.Rtc;
+
+public class RtcJoinResponse
+{
+    public required string ChannelId { get; set; }
+    public bool HasActiveCall { get; set; }
+    public bool IsOfferer { get; set; }
+    public string? OfferUser { get; set; }
+    public string? OfferSdp { get; set; }
+}

RelayServer/Models/Rtc/RtcLeaveRequest.cs

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+namespace RelayServer.Models.Rtc;
+
+public class RtcLeaveRequest
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+}

RelayServer/Models/Rtc/RtcOffer.cs

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+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models.Rtc;
+
+public class RtcOffer : Record
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+    public required string Sdp { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+}