Add progress updates as their own table

bookwyrm/view_actions.py

@@ -426,6 +426,15 @@ def edit_readthrough(request):
         return HttpResponseBadRequest()
     readthrough.save()
 
+    # record the progress update individually
+    # use default now for date field
+    progress_update = models.ProgressUpdate(
+        user=request.user,
+        book=readthrough.book,
+        progress=readthrough.pages_read,
+        mode=models.ProgressMode.PAGE)
+    progress_update.save()
+
     return redirect(request.headers.get('Referer', '/'))