WIP move baseitem to jellyfin.db

Jellyfin.Data/Entities/AttachmentStreamInfo.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace Jellyfin.Data.Entities;
+
+#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
+public class AttachmentStreamInfo
+{
+    public required Guid ItemId { get; set; }
+
+    public required int Index { get; set; }
+
+    public required string Codec { get; set; }
+
+    public string? CodecTag { get; set; }
+
+    public string? Comment { get; set; }
+
+    public string? Filename { get; set; }
+
+    public string? MimeType { get; set; }
+}