Generate fewer add_status_tasks

Previously, every time a status was saved, a task would start to add it
to people's timelines. This meant there were a ton of duplicate tasks
that were potentially heavy to run. Now, the Status model has a "ready"
field which indicates that it's worth updating the timelines. It
defaults to True, which prevents statuses from accidentally not being
added due to ready state.

The ready state is explicitly set to false in the view, which is the
source of most of the noise for that task.

bookwyrm/views/status.py

@@ -82,13 +82,16 @@ class CreateStatus(View):
                 return HttpResponseBadRequest()
             return redirect("/")
 
-        status = form.save(request)
+        status = form.save(request, commit=False)
+        status.ready = False
         # save the plain, unformatted version of the status for future editing
         status.raw_content = status.content
         if hasattr(status, "quote"):
             status.raw_quote = status.quote
 
         status.sensitive = status.content_warning not in [None, ""]
+        # the status has to be saved now before we can add many to many fields
+        # like mentions
         status.save(broadcast=False)
 
         # inspect the text for user tags
@@ -119,6 +122,7 @@ class CreateStatus(View):
         if hasattr(status, "quote"):
             status.quote = to_markdown(status.quote)
 
+        status.ready = True
         status.save(created=created)
 
         # update a readthrough, if needed