skip posts before last sent

main.py

@@ -120,8 +120,12 @@ async def check_updates():
             posts = await e621.get_posts(tags)
             if not posts:
                 return
-            already_sent = await redis.smismember('e621:sent', [p.id for p in posts])
-            for i in list(range(len(posts)))[::-1]:
+            already_sent: List = await redis.smismember('e621:sent', [p.id for p in posts])
+            last_index = len(posts)
+            if already_sent.count(True):
+                last_index = already_sent.index(True)
+                await redis.sadd('e621:sent', *[posts[i].id for i in range(last_index, len(posts))])
+            for i in list(range(len(posts)))[:last_index][::-1]:
                 if already_sent[i]:
                     continue
                 await send_post(posts[i], tag_list)
@@ -135,6 +139,8 @@ async def add_tag(msg: Message):
         await msg.reply('Please provide tag to subscribe to')
         return
     for tag in args.split():
+        posts = await e621.get_posts(tag)
+        await redis.sadd('e621:sent', *[post.id for post in posts])
         await redis.sadd('e621:subs', tag)
     await msg.reply(f'Tags {args} added')