fix(bot): add callback to update message count after proxying

also re-add -with-last-message flag :D

PluralKit.Core/Database/Utils/DatabaseMigrator.cs

@@ -9,7 +9,7 @@ namespace PluralKit.Core;
 internal class DatabaseMigrator
 {
     private const string RootPath = "PluralKit.Core.Database"; // "resource path" root for SQL files
-    private const int TargetSchemaVersion = 31;
+    private const int TargetSchemaVersion = 32;
     private readonly ILogger _logger;
 
     public DatabaseMigrator(ILogger logger)