Every one of these was wrong in a way the mock tests could not see, because
the mocks were written from the same upstream source the models were.
- `SystemLog.created_at`/`updated_at` are integer timestamps, not the date
strings the OpenAPI spec declares.
- `frequency_id` arrives as a numeric string on recurring invoices and
expenses, so both now decode through `int_or_numeric_string`.
- `Location.country_id`, `PurchaseOrder.status_id` and `Webhook.format` are
omitted when empty. The server runs `ConvertEmptyStringsToNull`, so an
unset `String` sent as `""` becomes NULL and then fails a non-null column
or an `integer` rule — which meant a create from a `Default` model could
not succeed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
awkawbandClaude Opus 5
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