- Forgot Password is limited to 3 codes an hour and 10 a day per email, and
an account gets 10 failed code checks a day across every code it is sent,
so new client addresses and new codes no longer buy more guesses. Refused
requests answer exactly like accepted ones.
- The reset email is queued to a background sender, and unregistered
addresses store a row no code can match, so both paths do the same work
and return without waiting on the mail provider. Each request also clears
expired codes.
- Code hashes are HMAC-SHA256 under a key derived with HKDF from the JWT
signing secret; rows in the previous unkeyed format stop matching.
- Email and code are read only from the JSON body.
