Some orgnization, and cleanup to come.

RelayServer/Models/Crypto/ClientPublicKeys.cs

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+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+public class ClientPublicKeys : Record
+{
+    public required string Username { get; set; }
+    public required string PublicKey { get; set; }
+    public required DateTime CreatedAt { get; set; }
+    public required DateTime UpdatedAt { get; set; }
+}

RelayServer/Models/Crypto/RtcSignalMessage.cs

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+namespace RelayServer.Models;
+
+public class RtcSignalMessage
+{
+    public required string Type { get; set; } // rtc_join / rtc_offer / rtc_answer / rtc_ice_candidate / rtc_leave
+    public required string From { get; set; }
+    public required string ChannelId { get; set; }
+
+    public string? Sdp { get; set; }
+    public string? Candidate { get; set; }
+    public string? SdpMid { get; set; }
+    public int? SdpMLineIndex { get; set; }
+}

RelayServer/Models/Crypto/ServerEncryptionKeys.cs

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+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models;
+
+public class ServerEncryptionKeys : Record
+{
+    public required string KeyBase64 { get; set; }
+    public required string PublicKey { get; set; }
+    public required string PrivateKey { get; set; }
+    public required DateTime CreatedAt { get; set; }
+    public required DateTime UpdatedAt { get; set; }
+}

RelayServer/Models/Crypto/ServerPublicKeyMessage.cs

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+namespace RelayServer.Models;
+
+public class ServerPublicKeyMessage
+{
+    public required string Type { get; set; }
+    public required string PublicKey { get; set; }
+}

RelayServer/Models/Crypto/SocketRtcSignalMessage.cs

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+namespace RelayServer.Models;
+
+public class SocketRtcSignalMessage
+{
+    public required string Type { get; set; } // encrypted_rtc_signal
+    public required string SenderUsername { get; set; }
+    public required string ChannelId { get; set; }
+
+    public required string CipherText { get; set; }
+    public required string Nonce { get; set; }
+    public required string Tag { get; set; }
+    public required string EncryptedKey { get; set; }
+}