Add empty Mutation type

src/Tgstation.Server.Host/Core/Application.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Frozen;
 using System.Collections.Generic;
 using System.Globalization;
@@ -294,7 +294,8 @@ namespace Tgstation.Server.Host.Core
 					.AddAuthorization()
 					.AddType<UnsignedIntType>()
 					.BindRuntimeType<Version, SemverType>()
-					.AddQueryType<Query>();
+					.AddQueryType<Query>()
+					.AddMutationType<Mutation>();
 
 			void AddTypedContext<TContext>()
 				where TContext : DatabaseContext

src/Tgstation.Server.Host/GraphQL/Mutation.cs

@@ -0,0 +1,11 @@
+namespace Tgstation.Server.Host.GraphQL
+{
+	/// <summary>
+	/// Root type for GraphQL mutations.
+	/// </summary>
+	public sealed class Mutation
+	{
+		// Intentionally left blank, use type extensions to properly scope operations to domains
+		// https://chillicream.com/docs/hotchocolate/v13/defining-a-schema/extending-types
+	}
+}