* Standardize error structure in json responses. Use named types for raising exceptions instead of http status codes peppered throughout the code.
* Whitespace fix
* Rename fix
* Consistent naming for things related to KnownException, for traceability.
* For input field validation errors, list the affected fields as separate json objects. Also uses cleaner helpers for exception mappers.
* Whitespace
* Rename to clarify exception class hierarchy
* Wrap not found responses in a schema and adjusted mapper to match
* Include issue id in comments.
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