I migrated my server to a different host and everything looks good but the door codes were forgotten on players.  Does anyone know where this is saved?

This data would be stored somewhere in rust db file. I don’t understand how players forgotten codes unless this migration took centuries, however if they owned the code lock they can technically reset it. You as an admin with a plugin like Admin Hammer, you can obtain the code to doors, and what not. Hope this helps.

Reference: https://umod.org/plugins/admin-hammer