Possibly fix issues

After doing testing with a test project, re-organized code to new method
of storing, as well as ensure that all Endpoint lambda's are separated
out into functions.

Large commit, will be testing.

FreeTubeSync/Model/SearchHistory.cs

@@ -0,0 +1,10 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace FreeTubeSync.Model;
+
+public class SearchHistory
+{
+    [Key]
+    public string _id { get; set; } = string.Empty;
+    public long lastUpdatedAt { get; set; }
+}