One-to-many relationship between chunks and postage stamps

[metacertain]

Summary

Right now, pullsync and pushsync presumes one-to-one relationship between content and supporting postage stamps, however multiple uploaders can upload partly or fully matching content, which can result in inadvertent loss of data.

Motivation

Correctness

Implementation

To be designed

Drawbacks

[github-actions[bot]]

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[ldeffenb]

I believe this really needs to be addressed, particularly for content that may be shared between multiple sites.