refs 9742
- when we've introduced Ghost 1.0, we have noticed that we broke Disqus comments
- Disqus comments use a unique identifier, which is the post id
- that means if you have exported your LTS content and imported it into 1.0, all resource identifiers are regenerated
- but the Disqus must use the original post resource id
- that's why we have imported the old post id and remembered it in the `amp` field 🤠
- that was the only field which was available and un-used
- now in Ghost 2.0, we would like to rename the `amp` field to `comment_id`
- string length: 50 (i thought it might be safer to not use 24 characters, because who knows if support other comment id's in the future)
7db0739296