DELF: Safeguarding deletion correctness in online social networks

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Introduced DELF, a framework for safeguarding data deletion correctness in online social networks. DELF enables developers to implement deletion logic via annotations rather than repetitive code, supporting billions of deletions daily. It employs correctness validation techniques, including static and dynamic checks, to prevent data retention or accidental deletion. DELF also handles asynchronous graph traversal for deletion, maintains a restoration log for undo operations, and automatically retries deletions, surfacing persistent errors to developers.