Based on the described scenario, one effective approach is to add a created_at field to the User model to track account creation time. Upon user registration, a verification email should be sent, and the account should remain inactive until the email is verified. If the user does not verify their email within a defined time window (e.g., 1 hour), the unverified account can be automatically deleted. This allows the same email address to be used again for registration after the expiration period, ensuring legitimate users are not blocked by inactive, unverified accounts.