Webhook.ReadAll already cleared the secret and basic-auth from responses,
but Create and Update did not, so the v2 handler patched the gap with a
maskWebhookCredentials helper. Centralize the masking in the model via a
maskCredentials helper called after every DB write (ReadAll, Create,
Update) and drop the v2 handler helper.
The credentials are client-provided, not server-generated: the DB row
keeps them and outgoing deliveries reload + HMAC-sign from the DB copy,
so clearing the returned in-memory struct is correct write-only handling.
Webhook is a shared model, so v1's create/update responses also stop
echoing the submitted secret/auth — intended, and approved by the
maintainer.
aac0322975