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Report -1 for statements that are not INSERT, UPDATE or DELETE (#374)

* Report -1 for statements that are not INSERT, UPDATE or DELETE

DbCommand.ExecuteNonQuery: "For UPDATE, INSERT, and DELETE statements,
the return value is the number of rows affected by the command. For all
other types of statements, the return value is -1."
DbDataReader.RecordsAffected: "-1 for SELECT statements; 0 if no rows
were affected". The reader returned -1 even after a DELETE.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Count MERGE COPY and RETURNING rows

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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