feat: import messages from go version

Catalogger.Backend/Database/DatabasePool.cs

@@ -148,19 +148,17 @@ public class DatabasePool
             Array.ConvertAll((long[])value, i => (ulong)i);
     }
 
-    public class JsonTypeHandler<T> : SqlMapper.TypeHandler<T>
+    private class JsonTypeHandler<T> : SqlMapper.TypeHandler<T>
     {
         public override T Parse(object value)
         {
-            string json = (string)value;
+            var json = (string)value;
             return JsonSerializer.Deserialize<T>(json)
                 ?? throw new CataloggerError("JsonTypeHandler<T> returned null");
         }
 
-        public override void SetValue(IDbDataParameter parameter, T? value)
-        {
+        public override void SetValue(IDbDataParameter parameter, T? value) =>
             parameter.Value = JsonSerializer.Serialize(value);
-        }
     }
 }