What's the maximum number of categories we can have?

Thanks @sam! Follow up question – what would the approximate limits be for:

  • the number of tags
  • the number of topics in a category

For example, can I have a few million unique tags, as well as a few million topics within a single category?

The tags, topic_tags, and topics tables don’t appear to be sharded, which should work for a few million rows, but I haven’t looked into the queries themselves, nor any UI that could potentially break.