What signing in does
It creates one row on a server: a username, a hash of your password, and a display name. Nothing else. There is no email address, because there is nothing to send you.
How the password is stored
Hashed with argon2id, which is the current recommendation for password storage. The password itself is never written down, so it is not in the database, not in a log, and not recoverable by anyone here — which is also why nobody can email it back to you.
Use a password you use nowhere else
This is a small independent project. Treat it the way you would treat any small independent project: assume it could be breached, and make sure that if it were, the damage stops here.
The wallet option
Connecting a wallet proves you control an address. Signing in with a wallet asks you to sign a short message — it moves nothing, approves nothing and costs nothing — which the server checks. You will never be asked to approve a transaction to sign in. If something claiming to be Last County asks you to, it is not us.