Summary Update.

RelayServer/Models/Chat/ChannelMessageEdits.cs

@@ -2,11 +2,24 @@ using SurrealDb.Net.Models;
 
 namespace RelayServer.Models;
 
+/// <summary>
+/// Surreal record for the `channel_message_edits` table. One row per historical version of
+/// an edited message — written by HandleEditMessage BEFORE overwriting the live row.
+///
+/// Encrypted with the channel AES key (same as ChannelMessages), so HandleGetEditHistory
+/// can decrypt + re-encrypt per requester.
+/// </summary>
 public class ChannelMessageEdits : Record
 {
+    /// <summary>"channel_messages:abc" — which live message this version belonged to.</summary>
     public required string MessageId { get; set; }
+
+    /// <summary>Base64 AES-GCM ciphertext of the JSON-serialised previous ChatMessageContent.</summary>
     public required string CipherText { get; set; }
+
     public required string Nonce { get; set; }
     public required string Tag { get; set; }
+
+    /// <summary>When this version was the current text (i.e. when it was replaced).</summary>
     public required DateTime EditedAt { get; set; }
 }