🗃️ Chat room modeling

DysonNetwork.Sphere/Chat/ChatRoom.cs

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+using System.ComponentModel.DataAnnotations;
+using System.Text.Json.Serialization;
+using DysonNetwork.Sphere.Storage;
+using NodaTime;
+
+namespace DysonNetwork.Sphere.Chat;
+
+public enum ChatRoomType
+{
+    Group,
+    DirectMessage
+}
+
+public class ChatRoom : ModelBase
+{
+    public long Id { get; set; }
+    [MaxLength(1024)] public string Name { get; set; } = string.Empty;
+    [MaxLength(4096)] public string Description { get; set; } = string.Empty;
+    public ChatRoomType Type { get; set; }
+    public bool IsPublic { get; set; }
+
+    public CloudFile? Picture { get; set; }
+    public CloudFile? Background { get; set; }
+
+    [JsonIgnore] public ICollection<ChatMember> Members { get; set; } = new List<ChatMember>();
+
+    public long? RealmId { get; set; }
+    public Realm.Realm? Realm { get; set; }
+}
+
+public enum ChatMemberRole
+{
+    Owner = 100,
+    Moderator = 50,
+    Normal = 0
+}
+
+public class ChatMember : ModelBase
+{
+    public long ChatRoomId { get; set; }
+    [JsonIgnore] public ChatRoom ChatRoom { get; set; } = null!;
+    public long AccountId { get; set; }
+    [JsonIgnore] public Account.Account Account { get; set; } = null!;
+
+    public ChatMemberRole Role { get; set; }
+    public Instant? JoinedAt { get; set; }
+    public bool IsBot { get; set; } = false;
+}