Object service upgrades

Common/VersionHelpers.cs

@@ -3,7 +3,6 @@
 using System.Diagnostics;
 using System.Net.Http.Headers;
 using System.Net.Http.Json;
-using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Text;
 

DatabaseTools/Services/CallbackTextWriter.cs

@@ -62,7 +62,7 @@ public override void Flush()
 		}
 
 		var line = _buffer.ToString();
-		_buffer.Clear();
+		_ = _buffer.Clear();
 		_onLine(line);
 	}
 }

Definitions/Database/Base/DbCoreObject.cs

@@ -39,4 +39,20 @@ public abstract class DbCoreObject : DbIdObject, IDbName, IDbDescription, IDbMet
 	public DateOnly UploadedDate { get; set; }
 
 	#endregion
+
+	#region Ownership
+
+	/// <summary>
+	/// The user who owns (uploaded) this object.
+	/// <see langword="null"/> for objects not owned by any user (e.g. imported/vanilla).
+	/// </summary>
+	public UniqueObjectId? OwnerUserId { get; set; }
+
+	/// <summary>
+	/// Navigation property to the owning user.
+	/// </summary>
+	[ForeignKey(nameof(OwnerUserId))]
+	public TblUser? OwnerUser { get; set; }
+
+	#endregion
 }