init

Catalogger.Backend/Cache/UserCacheService.cs

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+using System.Collections.Concurrent;
+using Remora.Discord.API.Abstractions.Objects;
+using Remora.Discord.API.Abstractions.Rest;
+using Remora.Rest.Core;
+
+namespace Catalogger.Backend.Cache;
+
+public class UserCacheService(IDiscordRestUserAPI userApi)
+{
+    private readonly ConcurrentDictionary<Snowflake, IUser> _cache = new();
+
+    public async Task<IUser?> GetUserAsync(Snowflake userId)
+    {
+        if (_cache.TryGetValue(userId, out var user)) return user;
+
+        var res = await userApi.GetUserAsync(userId);
+        if (!res.IsSuccess) return null;
+
+        _cache[userId] = res.Entity;
+        return res.Entity;
+    }
+
+    public void UpdateUser(IUser user) => _cache[user.ID] = user;
+}