If I want to completely delete a post, I should just hide them?

[sam (Sam Saffron)]

@quimgil

If there is a command-line instruction to delete such posts in exceptional circumstances, that would work too.

Yes there are …

./launcher enter app
rails c
Post.find(THE_POST_ID).destroy

Note this is 100% non recoverable short of grabbing a backup, so be careful.