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    Function resolveR2AvailabilityForKeys

    • HEAD unique R2 keys (deduped) and return an availability map for upload-history retry UI.

      Parameters

      • keys: Iterable<string>

        R2 object keys to check (duplicates are ignored).

      • Optionaloptions: { concurrency?: number }

        Optional tuning; defaults to R2_HEAD_CONCURRENCY.

      Returns Promise<Map<string, boolean>>

      Map from key to true (exists) or false (missing).