Can't store snippet result containing nul characters
If someone posts the following snippet:
the moulinette will pick it up, execute it successfully, and will try to put the result back.
While inserting in the DB it will fail, as Postgres does not like \x00 in strings.
So the "executed_at" field is not updated, and the moulinette will pick it up again the next round, and again, and again, and again...