computed_field_readonly

HTTP 422: Computed field is read-only

When it occurs

The write body includes computed (or a value nested under it). computed.block_seconds and computed.seconds_by_zone are derived server-side from blocks and published as read-only (ENT-05); a write repeating them back is rejected outright rather than silently ignored.

What to do next

Strip computed from the request body before sending, and read it back afterward instead.