Summary Update.

RelayServer/Models/Chat/ChannelMessages.cs

@@ -2,14 +2,36 @@ using SurrealDb.Net.Models;
 
 namespace RelayServer.Models;
 
+/// <summary>
+/// Surreal record for the `channel_messages` table. One row per message.
+///
+/// Encryption: CipherText/Nonce/Tag use the channel AES key (ChannelDbKey), NOT any user's
+/// RSA keypair. This means the server can decrypt for history queries; the per-recipient
+/// RSA wrapping happens at delivery time in DeliverToServerMembers.
+/// </summary>
 public class ChannelMessages : Record
 {
+    /// <summary>"channels:xyz" — which channel this belongs to.</summary>
     public required string ChannelId { get; set; }
+
+    /// <summary>"users:keeper317" — who wrote it. Lowercased to match CoreClientService's id format.</summary>
     public required string SenderUserId { get; set; }
+
+    /// <summary>Base64 AES-GCM ciphertext of the JSON-serialised ChatMessageContent.</summary>
     public required string CipherText { get; set; }
+
+    /// <summary>Base64 AES-GCM 96-bit nonce. Different every message.</summary>
     public required string Nonce { get; set; }
+
+    /// <summary>Base64 AES-GCM 128-bit authentication tag.</summary>
     public required string Tag { get; set; }
+
+    /// <summary>UTC timestamp of original send. Drives history ordering.</summary>
     public required DateTime CreatedAt { get; set; }
+
+    /// <summary>UTC timestamp of last edit. Null = never edited. Drives the (edited) bubble footer.</summary>
     public DateTime? EditedAt { get; set; }
+
+    /// <summary>Soft-delete flag. Tombstones in history responses; bubbles show "deleted" placeholder.</summary>
     public bool IsDeleted { get; set; }
 }