fix subscriptions

app/routes/threads.py

@@ -62,7 +62,7 @@ def thread(thread_id, slug):
     user = get_active_user()
     if user:
         subscription = Subscriptions.find({'user_id': user.id, 'thread_id': thread.id})
-        if subscription:
+        if subscription and last_post['created_at'] > int(subscription.last_seen):
             subscription.update({'last_seen': last_post['created_at']})
     return render_template(
         'threads/thread.html', thread=thread,
@@ -82,13 +82,16 @@ def reply(thread_id):
     if not user.can_post_to_thread_or_topic(thread):
         return redirect(url_for('.thread_by_id', thread_id=thread_id))
     post = Posts.new(user.id, thread.id, request.form.get('babycode_content'))
+    subscription = Subscriptions.find({'user_id': user.id, 'thread_id': thread.id})
     if get_form_checkbox('subscribe'):
-        if not Subscriptions.find({'user_id': user.id, 'thread_id': thread.id}):
-            Subscriptions.create({
+        if not subscription:
+            subscription = Subscriptions.create({
                 'user_id': user.id,
                 'thread_id': thread.id,
                 'last_seen': time_now(),
                 })
+    if subscription and subscription.last_seen < time_now():
+        subscription.update({'last_seen': time_now()})
     return redirect(url_for('.thread_by_id', thread_id=thread_id, after=post.id, _anchor=f'post-{post.id}'))
 
 @bp.get('/<int:thread_id>/edit/')