I have a bot that subscribes to (streams) all comments in a single subreddit. Occasionally the bot may die and restart due to an error or the host has to reboot. How do I make sure when the bot starts up it doesn't miss any comments. Let's take a worst case example the bot crashes and doesn't get restarted for over a day.

I am using PRAW. Using subreddit.stream.comments() I get some unclear number of existing comments, then new comments as they come in. I can remember the last comment ID I saw, but how do I ensure that I start at the one I left off on, ie: start at a specific date-time or comment ID, or make sure the overlap is big enough that I didn't miss any.