invalid_input

The policy engine rejected the input before checking any rule.

Common causes

• The body is not a plain object, or contains a value Castra cannot store (nested object, array, unsupported type).

How to fix

Send a flat JSON object of column values.

Response

{
  "type": "https://castra.mehmetozer.dev/problems/invalid_input",
  "title": "…",
  "status": 400,
  "detail": "…"
}

detail says what exactly went wrong for this request.