check that monitored tags are in added tags

main.py

@@ -140,6 +140,7 @@ async def check_updates():
         logging.warning('Lock acquired...')
         matched_posts = []
         tag_list = set(tuple(t.decode().split()) for t in await redis.smembers('e621:subs'))
+        tag_list_flat = set(sum(tag_list, ()))
         last_post_version = int((await redis.get('e621:last_version') or b'0').decode())
         post_versions: List[E621PostVersion] = []
         logging.warning(f'Getting post versions from id {last_post_version}')
@@ -152,6 +153,8 @@ async def check_updates():
         for post_version in post_versions[::-1]:
             if post_version.id > last_post_version:
                 last_post_version = post_version.id
+            if not bool(tag_list_flat & set(post_version.added_tags)):
+                continue
             post_tags = set(post_version.tags.split())
             for tag_group in tag_list:
                 if set(tag_group) <= post_tags: