{"id":"notification-instantiates-forward-only-delivery","text":"Notification delivery is a concrete instantiation of forward-only failure handling: double rate checks bound over-delivery, exponential backoff spaces retries, and escalation to permanent failure ensures the delivery pipeline terminates in finite time — the forward-only principle applied to the entire attempt-retry-escalate lifecycle.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["notification-delivery-is-bounded","forward-only-extends-to-failure-handling"],"outlist":[],"label":"Notification's bounded retry lifecycle is structurally isomorphic to forward-only failure handling"}],"dependents":["forward-only-is-universal-processing-primitive"],"metadata":{"last_reviewed":"2026-06-06T06:26:57","review_result":"pass"},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"notification-instantiates-forward-only-delivery","truth_value":"IN","reason":"SL justification valid","antecedents":["notification-delivery-is-bounded","forward-only-extends-to-failure-handling"],"label":"Notification's bounded retry lifecycle is structurally isomorphic to forward-only failure handling"},{"node":"notification-delivery-is-bounded","truth_value":"IN","reason":"SL justification valid","antecedents":["notification-defensive-double-rate-check","retry-escalates-to-permanent-failure"],"label":"complementary boundedness — rate checks bound throughput, retry escalation bounds duration"},{"node":"notification-defensive-double-rate-check","truth_value":"IN","reason":"SL justification valid","antecedents":["notif-two-phase-rate-limit","notif-rate-limit-on-success-only"],"label":"Queue delay between the two check points means neither alone is sufficient; failed retries not consuming budget prevents limit exhaustion from transient failures"},{"node":"notif-two-phase-rate-limit","truth_value":"IN","reason":"premise"},{"node":"notif-rate-limit-on-success-only","truth_value":"IN","reason":"premise"},{"node":"retry-escalates-to-permanent-failure","truth_value":"IN","reason":"SL justification valid","antecedents":["notif-exponential-backoff-with-jitter","retry-converts-timeout-to-failure"],"label":"Backoff prevents cascading load; finite retry count ensures eventual resolution (success or permanent failure) rather than indefinite limbo"},{"node":"notif-exponential-backoff-with-jitter","truth_value":"IN","reason":"premise"},{"node":"retry-converts-timeout-to-failure","truth_value":"IN","reason":"premise"},{"node":"forward-only-extends-to-failure-handling","truth_value":"IN","reason":"SL justification valid","antecedents":["forward-only-design-prevents-regression-and-maximizes-progress","retry-escalates-to-permanent-failure"],"label":"The d3 forward-only node covers normal state progression; the d1 retry node covers failure progression — the emergent property is that both follow the same no-rollback principle"},{"node":"forward-only-design-prevents-regression-and-maximizes-progress","truth_value":"IN","reason":"SL justification valid","antecedents":["state-ratchets-prevent-regression-across-domains","pipeline-processing-maximizes-forward-progress"],"label":"State ratchets and forward-progress pipelines are complementary mechanisms — ratchets prevent regression in stateful systems, pipelines prevent regression in dataflow systems"},{"node":"state-ratchets-prevent-regression-across-domains","truth_value":"IN","reason":"SL justification valid","antecedents":["chat-monotonic-read-progress","watermark-finalization-is-irreversible"],"label":"chat read cursors are monotonic (never re-mark as unread), aggregation windows follow OPEN→CLOSED→FINALIZED with no reversal — both are state ratchets that make backwards movement structurally impossible"},{"node":"chat-monotonic-read-progress","truth_value":"IN","reason":"SL justification valid","antecedents":["chat-dual-ordering-sequence-and-lamport","chat-read-cursors-monotonic"],"label":"Sequence-number ordering + monotonic cursors create an irreversible read-progress guarantee"},{"node":"chat-dual-ordering-sequence-and-lamport","truth_value":"IN","reason":"premise"},{"node":"chat-read-cursors-monotonic","truth_value":"IN","reason":"premise"},{"node":"watermark-finalization-is-irreversible","truth_value":"IN","reason":"SL justification valid","antecedents":["watermark-drives-finalization","window-lifecycle-one-directional","no-window-merging-or-retraction"],"label":"Three properties compose into hard irreversibility: watermark-only trigger + one-way lifecycle + no retraction"},{"node":"watermark-drives-finalization","truth_value":"IN","reason":"premise"},{"node":"window-lifecycle-one-directional","truth_value":"IN","reason":"premise"},{"node":"no-window-merging-or-retraction","truth_value":"IN","reason":"premise"},{"node":"pipeline-processing-maximizes-forward-progress","truth_value":"IN","reason":"SL justification valid","antecedents":["video-pipeline-maximizes-useful-work-on-failure","watermark-finalization-is-irreversible"],"label":"Video pipeline (branch-independent failure containment) and stream processing (irreversible finalization) both embody the same forward-only processing principle"},{"node":"video-pipeline-maximizes-useful-work-on-failure","truth_value":"IN","reason":"SL justification valid","antecedents":["dag-failure-cascade","youtube-pipeline-dag-structure"],"label":"DAG topology + selective cascade means a thumbnail failure doesn't block a successful transcode"},{"node":"dag-failure-cascade","truth_value":"IN","reason":"premise"},{"node":"youtube-pipeline-dag-structure","truth_value":"IN","reason":"premise"}]}}