{"id":"state-reversal-is-uniformly-guarded","text":"The codebase guards state reversal through layered mechanisms: soft delete serves dual purposes (preserving invariants locally, preventing resurrection distributedly), and permanent deletion requires preconditions (empty buckets, trashed state) — unless non-deletion reversals like hotel cancellation lack equivalent underflow guards, showing the reversal-safety pattern is incomplete.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["soft-delete-is-dual-purpose","deletion-is-guarded-by-preconditions"],"outlist":["hotel-cancel-no-underflow-guard"],"label":"Deletion is doubly guarded (depth-2 + depth-1), but cancel-without-underflow-guard (base, IN) shows reversal safety doesn't extend beyond delete operations"}],"dependents":["state-reversal-is-redundantly-prevented"],"metadata":{"last_reviewed":"2026-06-06T06:26:57","review_result":"pass"},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"state-reversal-is-uniformly-guarded","truth_value":"IN","reason":"SL justification valid","antecedents":["soft-delete-is-dual-purpose","deletion-is-guarded-by-preconditions"],"label":"Deletion is doubly guarded (depth-2 + depth-1), but cancel-without-underflow-guard (base, IN) shows reversal safety doesn't extend beyond delete operations","outlist":["hotel-cancel-no-underflow-guard"]},{"node":"soft-delete-is-dual-purpose","truth_value":"IN","reason":"SL justification valid","antecedents":["soft-delete-preserves-structural-invariants","soft-delete-prevents-distributed-resurrection"],"label":"Both depth-1 soft-delete conclusions identify different motivations (structural invariants vs. resurrection prevention) for the same technique, revealing dual utility"},{"node":"soft-delete-preserves-structural-invariants","truth_value":"IN","reason":"SL justification valid","antecedents":["chat-soft-delete-preserves-sequence","autocomplete-delete-is-soft"],"label":"chat keeps deleted messages with `[deleted]` content to preserve sequence numbering; autocomplete zeroes frequency without removing trie nodes to preserve tree structure — both are single-node structural concerns distinct from distributed anti-resurrection"},{"node":"chat-soft-delete-preserves-sequence","truth_value":"IN","reason":"premise"},{"node":"autocomplete-delete-is-soft","truth_value":"IN","reason":"premise"},{"node":"soft-delete-prevents-distributed-resurrection","truth_value":"IN","reason":"SL justification valid","antecedents":["kv-store-deletes-use-tombstones","s3-delete-marker-hides-not-removes"],"label":"Both systems independently arrived at write-over-delete to prevent resurrection from unsynchronized replicas"},{"node":"kv-store-deletes-use-tombstones","truth_value":"IN","reason":"premise"},{"node":"s3-delete-marker-hides-not-removes","truth_value":"IN","reason":"premise"},{"node":"deletion-is-guarded-by-preconditions","truth_value":"IN","reason":"SL justification valid","antecedents":["s3-bucket-delete-requires-empty","email-service-two-phase-delete"],"label":"Both systems gate permanent deletion behind a prior state transition, making accidental data loss a two-mistake problem"},{"node":"s3-bucket-delete-requires-empty","truth_value":"IN","reason":"premise"},{"node":"email-service-two-phase-delete","truth_value":"IN","reason":"premise"}]}}