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Each event's hash includes the previous hash, so deleting a row breaks the chain forward of that point.",[561,562,567],"pre",{"className":563,"code":564,"language":565,"meta":566,"style":566},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","auditOnly(\n  signed(createFsDrain({ dir: '.audit' }), { strategy: 'hash-chain' }),\n  { await: true },\n)\n","typescript","",[568,569,570,583,649,667],"code",{"__ignoreMap":566},[571,572,575,579],"span",{"class":573,"line":574},"line",1,[571,576,578],{"class":577},"s2Zo4","auditOnly",[571,580,582],{"class":581},"sTEyZ","(\n",[571,584,586,589,592,595,597,601,605,608,611,615,618,621,624,627,630,633,635,637,640,642,644,646],{"class":573,"line":585},2,[571,587,588],{"class":577},"  signed",[571,590,591],{"class":581},"(",[571,593,594],{"class":577},"createFsDrain",[571,596,591],{"class":581},[571,598,600],{"class":599},"sMK4o","{",[571,602,604],{"class":603},"swJcz"," dir",[571,606,607],{"class":599},":",[571,609,610],{"class":599}," '",[571,612,614],{"class":613},"sfazB",".audit",[571,616,617],{"class":599},"'",[571,619,620],{"class":599}," }",[571,622,623],{"class":581},")",[571,625,626],{"class":599},",",[571,628,629],{"class":599}," {",[571,631,632],{"class":603}," strategy",[571,634,607],{"class":599},[571,636,610],{"class":599},[571,638,639],{"class":613},"hash-chain",[571,641,617],{"class":599},[571,643,620],{"class":599},[571,645,623],{"class":581},[571,647,648],{"class":599},",\n",[571,650,652,655,658,660,664],{"class":573,"line":651},3,[571,653,654],{"class":599},"  {",[571,656,657],{"class":603}," await",[571,659,607],{"class":599},[571,661,663],{"class":662},"sfNiH"," true",[571,665,666],{"class":599}," },\n",[571,668,670],{"class":573,"line":669},4,[571,671,672],{"class":581},")\n",[674,675,676,683,684,687,688,691,692,695],"warning",{},[544,677,678,679,682],{},"Rotate ",[568,680,681],{},"secret"," for HMAC-signed audits annually."," When you rotate, embed a key id alongside the signature (e.g. extend ",[568,685,686],{},"AuditFields"," with ",[568,689,690],{},"keyId"," via ",[568,693,694],{},"declare module",") so old events stay verifiable against the previous secret. Verifiers should look up the key by id, not assume a single global secret.",[540,697,698,699,704],{},"See ",[700,701,703],"a",{"href":702},"\u002Fuse-cases\u002Faudit\u002Fpipeline#signed","Drains & Integrity"," for the difference between HMAC and hash-chain.",[553,706,708],{"id":707},"redact","Redact",[540,710,711,712,715],{},"Audit events run through your existing ",[568,713,714],{},"RedactConfig",". Compose with the strict audit preset to harden PII handling:",[561,717,719],{"className":563,"code":718,"language":565,"meta":566,"style":566},"import { auditRedactPreset } from 'evlog'\n\ninitLogger({\n  redact: {\n    paths: [\n      ...(auditRedactPreset.paths ?? []),\n    ],\n  },\n})\n",[568,720,721,745,751,761,771,782,805,813,819],{"__ignoreMap":566},[571,722,723,727,729,732,734,737,739,742],{"class":573,"line":574},[571,724,726],{"class":725},"s7zQu","import",[571,728,629],{"class":599},[571,730,731],{"class":581}," auditRedactPreset",[571,733,620],{"class":599},[571,735,736],{"class":725}," from",[571,738,610],{"class":599},[571,740,741],{"class":613},"evlog",[571,743,744],{"class":599},"'\n",[571,746,747],{"class":573,"line":585},[571,748,750],{"emptyLinePlaceholder":749},true,"\n",[571,752,753,756,758],{"class":573,"line":651},[571,754,755],{"class":577},"initLogger",[571,757,591],{"class":581},[571,759,760],{"class":599},"{\n",[571,762,763,766,768],{"class":573,"line":669},[571,764,765],{"class":603},"  redact",[571,767,607],{"class":599},[571,769,770],{"class":599}," {\n",[571,772,774,777,779],{"class":573,"line":773},5,[571,775,776],{"class":603},"    paths",[571,778,607],{"class":599},[571,780,781],{"class":581}," [\n",[571,783,785,788,791,794,797,800,803],{"class":573,"line":784},6,[571,786,787],{"class":599},"      ...",[571,789,790],{"class":581},"(auditRedactPreset",[571,792,793],{"class":599},".",[571,795,796],{"class":581},"paths ",[571,798,799],{"class":599},"??",[571,801,802],{"class":581}," [])",[571,804,648],{"class":599},[571,806,808,811],{"class":573,"line":807},7,[571,809,810],{"class":581},"    ]",[571,812,648],{"class":599},[571,814,816],{"class":573,"line":815},8,[571,817,818],{"class":599},"  },\n",[571,820,822,825],{"class":573,"line":821},9,[571,823,824],{"class":599},"}",[571,826,672],{"class":581},[540,828,829,830,833,834,833,837,840,841,833,844,833,847,833,850,833,853,833,856,859,860,863,864,867,868,793],{},"The preset redacts ",[568,831,832],{},"authorization",", ",[568,835,836],{},"cookie",[568,838,839],{},"set-cookie",", and common credential key names (",[568,842,843],{},"password",[568,845,846],{},"token",[568,848,849],{},"apiKey",[568,851,852],{},"cardNumber",[568,854,855],{},"cvv",[568,857,858],{},"ssn",") ",[544,861,862],{},"at any nesting depth"," — including inside ",[568,865,866],{},"audit.changes.before"," \u002F ",[568,869,870],{},"audit.changes.after",[553,872,874],{"id":873},"gdpr-vs-append-only","GDPR vs append-only",[540,876,877],{},"Append-only audit logs collide with GDPR's right to be forgotten. Recommended pattern today:",[879,880,881,885,888],"ol",{},[882,883,884],"li",{},"Keep audit rows immutable.",[882,886,887],{},"Encrypt PII fields with a per-actor key (held outside the audit store).",[882,889,890],{},"To \"forget\" a user, delete their key — the audit row stays, the chain stays valid, the PII becomes unreadable.",[540,892,893,894,897,898,793],{},"A built-in ",[568,895,896],{},"cryptoShredding"," helper is on the ",[700,899,903],{"href":900,"rel":901},"https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\u002Fissues",[902],"nofollow","follow-up roadmap",[553,905,907],{"id":906},"retention","Retention",[540,909,910],{},"Retention is a storage-layer concern by design. evlog's audit layer doesn't enforce retention windows because every supported sink already has a stronger, audited mechanism for it. Pick the one matching your sink:",[912,913,914,927],"table",{},[915,916,917],"thead",{},[918,919,920,924],"tr",{},[921,922,923],"th",{},"Sink",[921,925,926],{},"Retention mechanism",[928,929,930,943,954,962],"tbody",{},[918,931,932,936],{},[933,934,935],"td",{},"FS",[933,937,938,939,942],{},"Combine ",[568,940,941],{},"createFsDrain({ maxFiles })"," with a daily compactor.",[918,944,945,948],{},[933,946,947],{},"Postgres",[933,949,950,951,793],{},"Schedule ",[568,952,953],{},"DELETE FROM audit_events WHERE timestamp \u003C now() - interval '7 years'",[918,955,956,959],{},[933,957,958],{},"Axiom \u002F Datadog \u002F Loki",[933,960,961],{},"Set the dataset retention policy in the platform.",[918,963,964,967],{},[933,965,966],{},"S3 Object Lock",[933,968,969],{},"Configure lifecycle rules + Object Lock retention period.",[540,971,972],{},"Document the chosen window in your security policy. Auditors care about the written rule, not the enforcing component.",[553,974,976],{"id":975},"common-pitfalls","Common Pitfalls",[978,979,980,993,1016,1022,1041,1055],"ul",{},[882,981,982,985,986,687,989,992],{},[544,983,984],{},"Logging only successes."," Auditors care most about denials. Always pair ",[568,987,988],{},"log.audit()",[568,990,991],{},"log.audit.deny()"," on the negative branch of every authorisation check.",[882,994,995,1001,1002,1005,1006,1008,1009,833,1011,833,1013,1015],{},[544,996,997,998,793],{},"Leaking PII through ",[568,999,1000],{},"changes"," ",[568,1003,1004],{},"auditDiff()"," runs through your ",[568,1007,714],{},", but only if the field paths are listed. Add ",[568,1010,843],{},[568,1012,846],{},[568,1014,849],{},", etc. once globally so you never have to think about it again.",[882,1017,1018,1021],{},[544,1019,1020],{},"Treating audits as observability."," Don't sample, downsample, or summarise audit events. Force-keep is on by default — don't disable it.",[882,1023,1024,1001,1031,1033,1034,867,1037,1040],{},[544,1025,1026,1027,1030],{},"Conflating ",[568,1028,1029],{},"actor.id"," with the session id.",[568,1032,1029],{}," is the stable user id (or system identity). Correlate sessions via ",[568,1035,1036],{},"context.requestId",[568,1038,1039],{},"context.traceId",", never via the actor.",[882,1042,1043,1046,1047,1050,1051,1054],{},[544,1044,1045],{},"Forgetting standalone jobs."," Cron tasks, queue workers, and CLIs trigger audit-worthy actions too. Use ",[568,1048,1049],{},"audit()"," (no request) or ",[568,1052,1053],{},"withAudit()"," to keep coverage parity with your HTTP routes.",[882,1056,1057,1064],{},[544,1058,1059,1060,1063],{},"Skipping ",[568,1061,1062],{},"await: true"," on the audit drain."," Without it, audits are fire-and-forget — a crash between the event being emitted and the drain flushing means the action happened but no audit row exists.",[1066,1067,1068],"style",{},"html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sfNiH, html code.shiki .sfNiH{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}",{"title":566,"searchDepth":585,"depth":585,"links":1070},[1071,1072,1073,1074,1075],{"id":555,"depth":585,"text":556},{"id":707,"depth":585,"text":708},{"id":873,"depth":585,"text":874},{"id":906,"depth":585,"text":907},{"id":975,"depth":585,"text":976},"Integrity, redact presets, GDPR vs append-only, retention windows, and the most common pitfalls when shipping audit logs to production.","md",[1079,1082],{"label":703,"icon":400,"to":398,"color":1080,"variant":1081},"neutral","subtle",{"label":406,"icon":79,"to":407,"color":1080,"variant":1081},{},{"title":402,"icon":379},{"title":402,"description":1076},"x2HPX5Cl_FKMki9-IuWbnJAC6Zin9k28cRb7rDgQdcM",[1088,1090],{"title":397,"path":398,"stem":399,"description":1089,"icon":400,"children":-1},"auditEnricher to auto-fill request context, auditOnly to route audits to a dedicated sink, and signed for tamper-evident HMAC or hash-chain integrity.",{"title":406,"path":407,"stem":408,"description":1091,"icon":79,"children":-1},"File system, Axiom, and Postgres recipes for audit logs, plus mockAudit for tests and the full API reference.",1786743657467]