Status: IN
Both versioned storage (S3 version lists, GDrive version histories) and stream processing (finalized aggregation windows) use append-only semantics where history is never overwritten or retracted, ensuring complete audit trails and preventing any form of historical revision — a cross-cutting pattern spanning both persistence and computation.
Storage and streaming independently converge on append-only/no-retraction semantics for the same underlying reason: preventing historical revision
Depends on (SL): append-only-versioning-makes-restore-non-destructive, watermark-finalization-is-irreversible