Yeah, admin way works. For some reason, was thinking like in database console, never mind. As you say we need to open schema update call through admin. So except for supporting "alter" or "drop" of view definitions others should work. Some thing like

String modifySchema(String vdbName, int vdbVersion, String modelName, String type, String schema)

can u elaborate on metadata validation comment, should we revalidate all models again?

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