It's not stored in a database, but I wouldn't be surprised if it is still logged:
- Log all your inbound traffic. We keep logs on all in-bound connections. This enabled all of our investigations. You can’t investigate what you don’t log.
Whether they rely on standard IIS logs (which log URLs and some headers) or log POST bodies as well, I can't tell.
Also, one of the community projects out there may have noticed your new post through one of the websockets and retrieved the initial version through e.g. the API. Now and then, we see a post in Metasmoke which seems gibberish, but on the site it looks normal. (Or the other way around.) In those cases, the author edited the post during the grace period, but the original version is still archived somewhere.
What @rene says in the comments about the image being on imgur's servers is also true; the IDs are fairly random but it's plausible somebody accidentally stumbles on the image. I'm not sure if images from
i.stack.imgur.com are shown on the Newest feed but haven't we all tried putting random characters in the URL and see what we get?