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Raw upstream error messages returned to the client #304

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@lfrancke

File: src/lib/server/trino/queries.ts:176

Trino error messages are stored verbatim in query.error and surfaced through buildSnapshot.error to the client. Trino errors may expose schema details, table names, or internal query plans. These should be classified (query error vs. infrastructure error) and sanitised before being surfaced to users.

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