Refactored DB to be Series->Volumes->Chapters instead. All functionality that previously worked still works. Cleanup still needed.

API/Entities/AppUserProgress.cs

@@ -2,7 +2,7 @@
 namespace API.Entities
 {
     /// <summary>
-    /// Represents the progress a single user has on a given Volume.
+    /// Represents the progress a single user has on a given Volume. Progress is realistically tracked against the Volume's chapters.
     /// </summary>
     public class AppUserProgress
     {
@@ -11,6 +11,8 @@ namespace API.Entities
         public int VolumeId { get; set; }
         public int SeriesId { get; set; }
         
+        public int ChapterId { get; set; }
+        
         // Relationships
         public AppUser AppUser { get; set; }
         public int AppUserId { get; set; }