OPDC API error code

SAGE_SCHEMA_MISMATCH

HTTP status 422

A column or table the script expected and this Sage build does not have. 422.

The same condition track D's schema probe reports as "degraded".

The API answers with a problem document (RFC 9457) whose type is https://twinn.engineering/errors/sage-schema-mismatch, and with X-Error-Code: SAGE_SCHEMA_MISMATCH. Branch on the code, never on the detail text.

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