Status: IN
Deletion never destroys data regardless of distribution level or system type: single-node soft deletes preserve structural invariants, distributed tombstones prevent resurrection, versioned storage appends delete markers, and finalized stream results are irrevocable — the entire data lifecycle is append-only from local state through distributed storage to stream processing.
Deletion scales with distribution (depth-3, covering single/distributed) and append-only spans storage/streaming (depth-2) — combining shows append-only is the universal mutation model
Depends on (SL): deletion-strategy-scales-with-distribution, append-only-semantics-span-storage-and-streaming