crystall-punk-14/Content.Shared/Decals/DecalChunkUpdateEvent.cs

using System;
using System.Collections.Generic;
using Robust.Shared.GameObjects;
using Robust.Shared.Map;
using Robust.Shared.Maths;
using Robust.Shared.Serialization;

namespace Content.Shared.Decals
{
    [Serializable, NetSerializable]
    public sealed class DecalChunkUpdateEvent : EntityEventArgs
    {
        public Dictionary<GridId, Dictionary<Vector2i, Dictionary<uint, Decal>>> Data = new();
    }
}