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Each event's hash includes the previous hash, so deleting a row breaks the chain forward of that point.",[565,566,571],"pre",{"className":567,"code":568,"language":569,"meta":570,"style":570},"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","",[572,573,574,587,653,671],"code",{"__ignoreMap":570},[575,576,579,583],"span",{"class":577,"line":578},"line",1,[575,580,582],{"class":581},"s2Zo4","auditOnly",[575,584,586],{"class":585},"sTEyZ","(\n",[575,588,590,593,596,599,601,605,609,612,615,619,622,625,628,631,634,637,639,641,644,646,648,650],{"class":577,"line":589},2,[575,591,592],{"class":581},"  signed",[575,594,595],{"class":585},"(",[575,597,598],{"class":581},"createFsDrain",[575,600,595],{"class":585},[575,602,604],{"class":603},"sMK4o","{",[575,606,608],{"class":607},"swJcz"," dir",[575,610,611],{"class":603},":",[575,613,614],{"class":603}," '",[575,616,618],{"class":617},"sfazB",".audit",[575,620,621],{"class":603},"'",[575,623,624],{"class":603}," }",[575,626,627],{"class":585},")",[575,629,630],{"class":603},",",[575,632,633],{"class":603}," {",[575,635,636],{"class":607}," strategy",[575,638,611],{"class":603},[575,640,614],{"class":603},[575,642,643],{"class":617},"hash-chain",[575,645,621],{"class":603},[575,647,624],{"class":603},[575,649,627],{"class":585},[575,651,652],{"class":603},",\n",[575,654,656,659,662,664,668],{"class":577,"line":655},3,[575,657,658],{"class":603},"  {",[575,660,661],{"class":607}," await",[575,663,611],{"class":603},[575,665,667],{"class":666},"sfNiH"," true",[575,669,670],{"class":603}," },\n",[575,672,674],{"class":577,"line":673},4,[575,675,676],{"class":585},")\n",[678,679,680,687,688,691,692,695,696,699],"warning",{},[548,681,682,683,686],{},"Rotate ",[572,684,685],{},"secret"," for HMAC-signed audits annually."," When you rotate, embed a key id alongside the signature (e.g. extend ",[572,689,690],{},"AuditFields"," with ",[572,693,694],{},"keyId"," via ",[572,697,698],{},"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.",[544,701,702,703,708],{},"See ",[704,705,707],"a",{"href":706},"\u002Fuse-cases\u002Faudit\u002Fpipeline#signed","Drains & Integrity"," for the difference between HMAC and hash-chain.",[557,710,712],{"id":711},"redact","Redact",[544,714,715,716,719],{},"Audit events run through your existing ",[572,717,718],{},"RedactConfig",". Compose with the strict audit preset to harden PII handling:",[565,721,723],{"className":567,"code":722,"language":569,"meta":570,"style":570},"import { auditRedactPreset } from 'evlog'\n\ninitLogger({\n  redact: {\n    paths: [\n      ...(auditRedactPreset.paths ?? []),\n    ],\n  },\n})\n",[572,724,725,749,755,765,775,786,809,817,823],{"__ignoreMap":570},[575,726,727,731,733,736,738,741,743,746],{"class":577,"line":578},[575,728,730],{"class":729},"s7zQu","import",[575,732,633],{"class":603},[575,734,735],{"class":585}," auditRedactPreset",[575,737,624],{"class":603},[575,739,740],{"class":729}," from",[575,742,614],{"class":603},[575,744,745],{"class":617},"evlog",[575,747,748],{"class":603},"'\n",[575,750,751],{"class":577,"line":589},[575,752,754],{"emptyLinePlaceholder":753},true,"\n",[575,756,757,760,762],{"class":577,"line":655},[575,758,759],{"class":581},"initLogger",[575,761,595],{"class":585},[575,763,764],{"class":603},"{\n",[575,766,767,770,772],{"class":577,"line":673},[575,768,769],{"class":607},"  redact",[575,771,611],{"class":603},[575,773,774],{"class":603}," {\n",[575,776,778,781,783],{"class":577,"line":777},5,[575,779,780],{"class":607},"    paths",[575,782,611],{"class":603},[575,784,785],{"class":585}," [\n",[575,787,789,792,795,798,801,804,807],{"class":577,"line":788},6,[575,790,791],{"class":603},"      ...",[575,793,794],{"class":585},"(auditRedactPreset",[575,796,797],{"class":603},".",[575,799,800],{"class":585},"paths ",[575,802,803],{"class":603},"??",[575,805,806],{"class":585}," [])",[575,808,652],{"class":603},[575,810,812,815],{"class":577,"line":811},7,[575,813,814],{"class":585},"    ]",[575,816,652],{"class":603},[575,818,820],{"class":577,"line":819},8,[575,821,822],{"class":603},"  },\n",[575,824,826,829],{"class":577,"line":825},9,[575,827,828],{"class":603},"}",[575,830,676],{"class":585},[544,832,833,834,837,838,837,841,844,845,837,848,837,851,837,854,837,857,837,860,863,864,867,868,871,872,797],{},"The preset redacts ",[572,835,836],{},"authorization",", ",[572,839,840],{},"cookie",[572,842,843],{},"set-cookie",", and common credential key names (",[572,846,847],{},"password",[572,849,850],{},"token",[572,852,853],{},"apiKey",[572,855,856],{},"cardNumber",[572,858,859],{},"cvv",[572,861,862],{},"ssn",") ",[548,865,866],{},"at any nesting depth",", including inside ",[572,869,870],{},"audit.changes.before"," \u002F ",[572,873,874],{},"audit.changes.after",[557,876,878],{"id":877},"gdpr-vs-append-only","GDPR vs append-only",[544,880,881],{},"Append-only audit logs collide with GDPR's right to be forgotten. Recommended pattern today:",[883,884,885,889,892],"ol",{},[886,887,888],"li",{},"Keep audit rows immutable.",[886,890,891],{},"Encrypt PII fields with a per-actor key (held outside the audit store).",[886,893,894],{},"To \"forget\" a user, delete their key. The audit row stays, the chain stays valid, the PII becomes unreadable.",[544,896,897,898,901,902,797],{},"A built-in ",[572,899,900],{},"cryptoShredding"," helper is on the ",[704,903,907],{"href":904,"rel":905},"https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\u002Fissues",[906],"nofollow","follow-up roadmap",[557,909,911],{"id":910},"retention","Retention",[544,913,914],{},"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:",[916,917,918,931],"table",{},[919,920,921],"thead",{},[922,923,924,928],"tr",{},[925,926,927],"th",{},"Drain",[925,929,930],{},"Retention mechanism",[932,933,934,947,958,966],"tbody",{},[922,935,936,940],{},[937,938,939],"td",{},"FS",[937,941,942,943,946],{},"Combine ",[572,944,945],{},"createFsDrain({ maxFiles })"," with a daily compactor.",[922,948,949,952],{},[937,950,951],{},"Postgres",[937,953,954,955,797],{},"Schedule ",[572,956,957],{},"DELETE FROM audit_events WHERE timestamp \u003C now() - interval '7 years'",[922,959,960,963],{},[937,961,962],{},"Axiom \u002F Datadog \u002F Loki",[937,964,965],{},"Set the dataset retention policy in the platform.",[922,967,968,971],{},[937,969,970],{},"S3 Object Lock",[937,972,973],{},"Configure lifecycle rules + Object Lock retention period.",[544,975,976],{},"Document the chosen window in your security policy. Auditors care about the written rule, not the enforcing component.",[557,978,980],{"id":979},"common-pitfalls","Common Pitfalls",[982,983,984,997,1020,1026,1045,1059],"ul",{},[886,985,986,989,990,691,993,996],{},[548,987,988],{},"Logging only successes."," Auditors care most about denials. Always pair ",[572,991,992],{},"log.audit()",[572,994,995],{},"log.audit.deny()"," on the negative branch of every authorisation check.",[886,998,999,1005,1006,1009,1010,1012,1013,837,1015,837,1017,1019],{},[548,1000,1001,1002,797],{},"Leaking PII through ",[572,1003,1004],{},"changes"," ",[572,1007,1008],{},"auditDiff()"," runs through your ",[572,1011,718],{},", but only if the field paths are listed. Add ",[572,1014,847],{},[572,1016,850],{},[572,1018,853],{},", etc. once globally so you never have to think about it again.",[886,1021,1022,1025],{},[548,1023,1024],{},"Treating audits as observability."," Don't sample, downsample, or summarise audit events. Force-keep is on by default. Do not disable it.",[886,1027,1028,1005,1035,1037,1038,871,1041,1044],{},[548,1029,1030,1031,1034],{},"Conflating ",[572,1032,1033],{},"actor.id"," with the session id.",[572,1036,1033],{}," is the stable user id (or system identity). Correlate sessions via ",[572,1039,1040],{},"context.requestId",[572,1042,1043],{},"context.traceId",", never via the actor.",[886,1046,1047,1050,1051,1054,1055,1058],{},[548,1048,1049],{},"Forgetting standalone jobs."," Cron tasks, queue workers, and CLIs trigger audit-worthy actions too. Use ",[572,1052,1053],{},"audit()"," (no request) or ",[572,1056,1057],{},"withAudit()"," to keep coverage parity with your HTTP routes.",[886,1060,1061,1068],{},[548,1062,1063,1064,1067],{},"Skipping ",[572,1065,1066],{},"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.",[1070,1071,1072],"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":570,"searchDepth":589,"depth":589,"links":1074},[1075,1076,1077,1078,1079],{"id":559,"depth":589,"text":560},{"id":711,"depth":589,"text":712},{"id":877,"depth":589,"text":878},{"id":910,"depth":589,"text":911},{"id":979,"depth":589,"text":980},"Integrity, redact presets, GDPR vs append-only, retention windows, and the most common pitfalls when shipping audit logs to production.","md",[1083,1086],{"label":707,"icon":400,"to":398,"color":1084,"variant":1085},"neutral","subtle",{"label":406,"icon":79,"to":407,"color":1084,"variant":1085},{},{"title":402,"icon":379},{"title":402,"description":1080},"7aa1Vjc1T6TTod3Yu0i2B3xXKkgUovgT9Zzo1K3mM4w",[1092,1094],{"title":397,"path":398,"stem":399,"description":1093,"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":1095,"icon":79,"children":-1},"File system, Axiom, and Postgres recipes for audit logs, plus mockAudit for tests and the full API reference.",1786817430269]