Is there a hard limit for the number of posts in a single topic? I couldn’t find any information about a ceiling for this, but wanted to be sure before I write a script that will insert about 20,000 posts (ingesting messages from a very long chat log) into a single topic, which will continue to grow larger over time.
By default the setting
auto close topics post count is set to 10k. I recommend keeping stuff below this number, you can break into a new topic every N (where N ~ 1k) and link between posts.
Usually a date range is helpful here in the topic title like
NFL teams chat 2015
Arsenal is the best! Nov 2015
Gardening progress, Spring 2013
And of course you can use categories or tags (or just a common identical topic title minus dates) to tie them together.