this post was submitted on 01 Aug 2024
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The fact that they managed to restore overwritten posts after people started to delete their history.
Reddit used to be open source. There is still a copy of that source available on github. It’s 7 years old so it’s probably significantly different from what they are running now. Still, it gives some insight into the design.
For example, deleted comments aren’t deleted, it just sets a deleted flag. Example code that shows this.
I haven’t dug around the code enough to figure out how editing works, it’s Python code so an unreadable mess. The database design also seems very strange. It’s like they built a database system on top of a database.
FWIW even when you properly delete something from a database table, the deleted row can be reconstructed from the audit tables. And even if that weren't the case, databases are regularly backed up to tape drives or whatever - when people delete or munge all their comments, Reddit doesn't go back into all the backups and make the same changes there. In fact, I would imagine that when they sell their shit to companies for AI training, they sell old pre-AI backups rather than a latest copy.
I never claimed it was evidence of how it currently works, only that it gives some insight into how Reddit was designed. I would be very surprised if they changed this aspect of the design. It makes sense to not delete comments or edits for reasons I mentioned before. Unfortunately we won’t know for sure unless Reddit confirms it.