OPDC API error code

SAGE_NOT_NULL_VIOLATION

HTTP status 422

A column this Sage build requires received no value: Msg 515, NOT NULL. 422, and permanent.

The other half of SAGE_SCHEMA_MISMATCH: there the column does not exist in this Sage build, here it exists and is mandatory. Both mean the request and the installed schema disagree.

The API answers with a problem document (RFC 9457) whose type is https://twinn.engineering/errors/sage-not-null-violation, and with X-Error-Code: SAGE_NOT_NULL_VIOLATION. Branch on the code, never on the detail text.

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