The ten sqlclosecheck findings were not leaks: every one of these queries already deferred a close through the package-local CloseRows helper. sqlclosecheck only recognises a Close call on the rows value in the function that produced it (directly deferred, or inside a deferred closure), so a call that hands rows to a helper reads as unhandled. Rather than keep a helper the linter cannot see through, drop CloseRows and defer a closure that calls rows.Close() directly at each of the eighteen call sites, keeping the existing fatal-on-close-error behaviour byte for byte. The close still runs exactly once, on function exit, after the rows have been read. Fatalf stays; it is still used by the transaction helpers.
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759 B