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Each event's hash includes the previous hash, so deleting a row breaks the chain forward of that point.",[608,609,614],"pre",{"className":610,"code":611,"language":612,"meta":613,"style":613},"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","",[615,616,617,630,696,714],"code",{"__ignoreMap":613},[618,619,622,626],"span",{"class":620,"line":621},"line",1,[618,623,625],{"class":624},"s2Zo4","auditOnly",[618,627,629],{"class":628},"sTEyZ","(\n",[618,631,633,636,639,642,644,648,652,655,658,662,665,668,671,674,677,680,682,684,687,689,691,693],{"class":620,"line":632},2,[618,634,635],{"class":624},"  signed",[618,637,638],{"class":628},"(",[618,640,641],{"class":624},"createFsDrain",[618,643,638],{"class":628},[618,645,647],{"class":646},"sMK4o","{",[618,649,651],{"class":650},"swJcz"," dir",[618,653,654],{"class":646},":",[618,656,657],{"class":646}," '",[618,659,661],{"class":660},"sfazB",".audit",[618,663,664],{"class":646},"'",[618,666,667],{"class":646}," }",[618,669,670],{"class":628},")",[618,672,673],{"class":646},",",[618,675,676],{"class":646}," {",[618,678,679],{"class":650}," strategy",[618,681,654],{"class":646},[618,683,657],{"class":646},[618,685,686],{"class":660},"hash-chain",[618,688,664],{"class":646},[618,690,667],{"class":646},[618,692,670],{"class":628},[618,694,695],{"class":646},",\n",[618,697,699,702,705,707,711],{"class":620,"line":698},3,[618,700,701],{"class":646},"  {",[618,703,704],{"class":650}," await",[618,706,654],{"class":646},[618,708,710],{"class":709},"sfNiH"," true",[618,712,713],{"class":646}," },\n",[618,715,717],{"class":620,"line":716},4,[618,718,719],{"class":628},")\n",[721,722,723,730,731,734,735,738,739,742],"warning",{},[591,724,725,726,729],{},"Rotate ",[615,727,728],{},"secret"," for HMAC-signed audits annually."," When you rotate, embed a key id alongside the signature (e.g. extend ",[615,732,733],{},"AuditFields"," with ",[615,736,737],{},"keyId"," via ",[615,740,741],{},"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.",[587,744,745,746,751],{},"See ",[747,748,750],"a",{"href":749},"\u002Fuse-cases\u002Faudit\u002Fpipeline#signed","Drains & Integrity"," for the difference between HMAC and hash-chain.",[600,753,755],{"id":754},"redact","Redact",[587,757,758,759,762],{},"Audit events run through your existing ",[615,760,761],{},"RedactConfig",". Compose with the strict audit preset to harden PII handling:",[608,764,766],{"className":610,"code":765,"language":612,"meta":613,"style":613},"import { auditRedactPreset } from 'evlog'\n\ninitLogger({\n  redact: {\n    paths: [\n      ...(auditRedactPreset.paths ?? []),\n    ],\n  },\n})\n",[615,767,768,792,798,808,818,829,852,860,866],{"__ignoreMap":613},[618,769,770,774,776,779,781,784,786,789],{"class":620,"line":621},[618,771,773],{"class":772},"s7zQu","import",[618,775,676],{"class":646},[618,777,778],{"class":628}," auditRedactPreset",[618,780,667],{"class":646},[618,782,783],{"class":772}," from",[618,785,657],{"class":646},[618,787,788],{"class":660},"evlog",[618,790,791],{"class":646},"'\n",[618,793,794],{"class":620,"line":632},[618,795,797],{"emptyLinePlaceholder":796},true,"\n",[618,799,800,803,805],{"class":620,"line":698},[618,801,802],{"class":624},"initLogger",[618,804,638],{"class":628},[618,806,807],{"class":646},"{\n",[618,809,810,813,815],{"class":620,"line":716},[618,811,812],{"class":650},"  redact",[618,814,654],{"class":646},[618,816,817],{"class":646}," {\n",[618,819,821,824,826],{"class":620,"line":820},5,[618,822,823],{"class":650},"    paths",[618,825,654],{"class":646},[618,827,828],{"class":628}," [\n",[618,830,832,835,838,841,844,847,850],{"class":620,"line":831},6,[618,833,834],{"class":646},"      ...",[618,836,837],{"class":628},"(auditRedactPreset",[618,839,840],{"class":646},".",[618,842,843],{"class":628},"paths ",[618,845,846],{"class":646},"??",[618,848,849],{"class":628}," [])",[618,851,695],{"class":646},[618,853,855,858],{"class":620,"line":854},7,[618,856,857],{"class":628},"    ]",[618,859,695],{"class":646},[618,861,863],{"class":620,"line":862},8,[618,864,865],{"class":646},"  },\n",[618,867,869,872],{"class":620,"line":868},9,[618,870,871],{"class":646},"}",[618,873,719],{"class":628},[587,875,876,877,880,881,880,884,887,888,880,891,880,894,880,897,880,900,880,903,906,907,910,911,914,915,840],{},"The preset redacts ",[615,878,879],{},"authorization",", ",[615,882,883],{},"cookie",[615,885,886],{},"set-cookie",", and common credential key names (",[615,889,890],{},"password",[615,892,893],{},"token",[615,895,896],{},"apiKey",[615,898,899],{},"cardNumber",[615,901,902],{},"cvv",[615,904,905],{},"ssn",") ",[591,908,909],{},"at any nesting depth",", including inside ",[615,912,913],{},"audit.changes.before"," \u002F ",[615,916,917],{},"audit.changes.after",[600,919,921],{"id":920},"gdpr-vs-append-only","GDPR vs append-only",[587,923,924],{},"Append-only audit logs collide with GDPR's right to be forgotten. Recommended pattern today:",[926,927,928,932,935],"ol",{},[929,930,931],"li",{},"Keep audit rows immutable.",[929,933,934],{},"Encrypt PII fields with a per-actor key (held outside the audit store).",[929,936,937],{},"To \"forget\" a user, delete their key. The audit row stays, the chain stays valid, the PII becomes unreadable.",[587,939,940,941,944,945,840],{},"A built-in ",[615,942,943],{},"cryptoShredding"," helper is on the ",[747,946,950],{"href":947,"rel":948},"https:\u002F\u002Fgithub.com\u002Fevloghq\u002Fevlog\u002Fissues",[949],"nofollow","follow-up roadmap",[600,952,954],{"id":953},"retention","Retention",[587,956,957],{},"Retention is a storage-layer concern by design. evlog's audit layer doesn't enforce retention windows because every supported drain already has a stronger, audited mechanism for it. Pick the one matching your drain:",[959,960,961,974],"table",{},[962,963,964],"thead",{},[965,966,967,971],"tr",{},[968,969,970],"th",{},"Drain",[968,972,973],{},"Retention mechanism",[975,976,977,990,1001,1009],"tbody",{},[965,978,979,983],{},[980,981,982],"td",{},"FS",[980,984,985,986,989],{},"Combine ",[615,987,988],{},"createFsDrain({ maxFiles })"," with a daily compactor.",[965,991,992,995],{},[980,993,994],{},"Postgres",[980,996,997,998,840],{},"Schedule ",[615,999,1000],{},"DELETE FROM audit_events WHERE timestamp \u003C now() - interval '7 years'",[965,1002,1003,1006],{},[980,1004,1005],{},"Axiom \u002F Datadog \u002F Loki",[980,1007,1008],{},"Set the dataset retention policy in the platform.",[965,1010,1011,1014],{},[980,1012,1013],{},"S3 Object Lock",[980,1015,1016],{},"Configure lifecycle rules + Object Lock retention period.",[587,1018,1019],{},"Document the chosen window in your security policy. Auditors care about the written rule, not the enforcing component.",[600,1021,1023],{"id":1022},"common-pitfalls","Common Pitfalls",[1025,1026,1027,1040,1063,1069,1088,1102],"ul",{},[929,1028,1029,1032,1033,734,1036,1039],{},[591,1030,1031],{},"Logging only successes."," Auditors care most about denials. Always pair ",[615,1034,1035],{},"log.audit()",[615,1037,1038],{},"log.audit.deny()"," on the negative branch of every authorisation check.",[929,1041,1042,1048,1049,1052,1053,1055,1056,880,1058,880,1060,1062],{},[591,1043,1044,1045,840],{},"Leaking PII through ",[615,1046,1047],{},"changes"," ",[615,1050,1051],{},"auditDiff()"," runs through your ",[615,1054,761],{},", but only if the field paths are listed. Add ",[615,1057,890],{},[615,1059,893],{},[615,1061,896],{},", etc. once globally so you never have to think about it again.",[929,1064,1065,1068],{},[591,1066,1067],{},"Treating audits as observability."," Don't sample, downsample, or summarise audit events. Force-keep is on by default. Do not disable it.",[929,1070,1071,1048,1078,1080,1081,914,1084,1087],{},[591,1072,1073,1074,1077],{},"Conflating ",[615,1075,1076],{},"actor.id"," with the session id.",[615,1079,1076],{}," is the stable user id (or system identity). Correlate sessions via ",[615,1082,1083],{},"context.requestId",[615,1085,1086],{},"context.traceId",", never via the actor.",[929,1089,1090,1093,1094,1097,1098,1101],{},[591,1091,1092],{},"Forgetting standalone jobs."," Cron tasks, queue workers, and CLIs trigger audit-worthy actions too. Use ",[615,1095,1096],{},"audit()"," (no request) or ",[615,1099,1100],{},"withAudit()"," to keep coverage parity with your HTTP routes.",[929,1103,1104,1111],{},[591,1105,1106,1107,1110],{},"Skipping ",[615,1108,1109],{},"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.",[1113,1114,1115],"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":613,"searchDepth":632,"depth":632,"links":1117},[1118,1119,1120,1121,1122],{"id":602,"depth":632,"text":603},{"id":754,"depth":632,"text":755},{"id":920,"depth":632,"text":921},{"id":953,"depth":632,"text":954},{"id":1022,"depth":632,"text":1023},"Integrity, redact presets, GDPR vs append-only, retention windows, and the most common pitfalls when shipping audit logs to production.","md",[1126,1129],{"label":750,"icon":409,"to":407,"color":1127,"variant":1128},"neutral","subtle",{"label":415,"icon":84,"to":416,"color":1127,"variant":1128},{},{"title":411,"icon":388},{"title":411,"description":1123},"eaty2Zo1S4rASyAl6Gj6gIQlclu1msskU-4fakBhs0c",[1135,1137],{"title":406,"path":407,"stem":408,"description":1136,"icon":409,"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":415,"path":416,"stem":417,"description":1138,"icon":84,"children":-1},"File system, Axiom, and Postgres recipes for audit logs, plus mockAudit for tests and the full API reference.",1789074373684]