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Each event's hash includes the previous hash, so deleting a row breaks the chain forward of that point.",[625,626,631],"pre",{"className":627,"code":628,"language":629,"meta":630,"style":630},"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","",[632,633,634,647,713,731],"code",{"__ignoreMap":630},[635,636,639,643],"span",{"class":637,"line":638},"line",1,[635,640,642],{"class":641},"s2Zo4","auditOnly",[635,644,646],{"class":645},"sTEyZ","(\n",[635,648,650,653,656,659,661,665,669,672,675,679,682,685,688,691,694,697,699,701,704,706,708,710],{"class":637,"line":649},2,[635,651,652],{"class":641},"  signed",[635,654,655],{"class":645},"(",[635,657,658],{"class":641},"createFsDrain",[635,660,655],{"class":645},[635,662,664],{"class":663},"sMK4o","{",[635,666,668],{"class":667},"swJcz"," dir",[635,670,671],{"class":663},":",[635,673,674],{"class":663}," '",[635,676,678],{"class":677},"sfazB",".audit",[635,680,681],{"class":663},"'",[635,683,684],{"class":663}," }",[635,686,687],{"class":645},")",[635,689,690],{"class":663},",",[635,692,693],{"class":663}," {",[635,695,696],{"class":667}," strategy",[635,698,671],{"class":663},[635,700,674],{"class":663},[635,702,703],{"class":677},"hash-chain",[635,705,681],{"class":663},[635,707,684],{"class":663},[635,709,687],{"class":645},[635,711,712],{"class":663},",\n",[635,714,716,719,722,724,728],{"class":637,"line":715},3,[635,717,718],{"class":663},"  {",[635,720,721],{"class":667}," await",[635,723,671],{"class":663},[635,725,727],{"class":726},"sfNiH"," true",[635,729,730],{"class":663}," },\n",[635,732,734],{"class":637,"line":733},4,[635,735,736],{"class":645},")\n",[738,739,740,747,748,751,752,755,756,759],"warning",{},[608,741,742,743,746],{},"Rotate ",[632,744,745],{},"secret"," for HMAC-signed audits annually."," When you rotate, embed a key id alongside the signature (e.g. extend ",[632,749,750],{},"AuditFields"," with ",[632,753,754],{},"keyId"," via ",[632,757,758],{},"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.",[604,761,762,763,768],{},"See ",[764,765,767],"a",{"href":766},"\u002Fuse-cases\u002Faudit\u002Fpipeline#signed","Drains & Integrity"," for the difference between HMAC and hash-chain.",[617,770,772],{"id":771},"redact","Redact",[604,774,775,776,779],{},"Audit events run through your existing ",[632,777,778],{},"RedactConfig",". Compose with the strict audit preset to harden PII handling:",[625,781,783],{"className":627,"code":782,"language":629,"meta":630,"style":630},"import { auditRedactPreset } from 'evlog'\n\ninitLogger({\n  redact: {\n    paths: [\n      ...(auditRedactPreset.paths ?? []),\n    ],\n  },\n})\n",[632,784,785,809,815,825,835,846,869,877,883],{"__ignoreMap":630},[635,786,787,791,793,796,798,801,803,806],{"class":637,"line":638},[635,788,790],{"class":789},"s7zQu","import",[635,792,693],{"class":663},[635,794,795],{"class":645}," auditRedactPreset",[635,797,684],{"class":663},[635,799,800],{"class":789}," from",[635,802,674],{"class":663},[635,804,805],{"class":677},"evlog",[635,807,808],{"class":663},"'\n",[635,810,811],{"class":637,"line":649},[635,812,814],{"emptyLinePlaceholder":813},true,"\n",[635,816,817,820,822],{"class":637,"line":715},[635,818,819],{"class":641},"initLogger",[635,821,655],{"class":645},[635,823,824],{"class":663},"{\n",[635,826,827,830,832],{"class":637,"line":733},[635,828,829],{"class":667},"  redact",[635,831,671],{"class":663},[635,833,834],{"class":663}," {\n",[635,836,838,841,843],{"class":637,"line":837},5,[635,839,840],{"class":667},"    paths",[635,842,671],{"class":663},[635,844,845],{"class":645}," [\n",[635,847,849,852,855,858,861,864,867],{"class":637,"line":848},6,[635,850,851],{"class":663},"      ...",[635,853,854],{"class":645},"(auditRedactPreset",[635,856,857],{"class":663},".",[635,859,860],{"class":645},"paths ",[635,862,863],{"class":663},"??",[635,865,866],{"class":645}," [])",[635,868,712],{"class":663},[635,870,872,875],{"class":637,"line":871},7,[635,873,874],{"class":645},"    ]",[635,876,712],{"class":663},[635,878,880],{"class":637,"line":879},8,[635,881,882],{"class":663},"  },\n",[635,884,886,889],{"class":637,"line":885},9,[635,887,888],{"class":663},"}",[635,890,736],{"class":645},[604,892,893,894,897,898,897,901,904,905,897,908,897,911,897,914,897,917,897,920,923,924,927,928,931,932,857],{},"The preset redacts ",[632,895,896],{},"authorization",", ",[632,899,900],{},"cookie",[632,902,903],{},"set-cookie",", and common credential key names (",[632,906,907],{},"password",[632,909,910],{},"token",[632,912,913],{},"apiKey",[632,915,916],{},"cardNumber",[632,918,919],{},"cvv",[632,921,922],{},"ssn",") ",[608,925,926],{},"at any nesting depth",", including inside ",[632,929,930],{},"audit.changes.before"," \u002F ",[632,933,934],{},"audit.changes.after",[617,936,938],{"id":937},"gdpr-vs-append-only","GDPR vs append-only",[604,940,941],{},"Append-only audit logs collide with GDPR's right to be forgotten. Recommended pattern today:",[943,944,945,949,952],"ol",{},[946,947,948],"li",{},"Keep audit rows immutable.",[946,950,951],{},"Encrypt PII fields with a per-actor key (held outside the audit store).",[946,953,954],{},"To \"forget\" a user, delete their key. The audit row stays, the chain stays valid, the PII becomes unreadable.",[604,956,957,958,961,962,857],{},"A built-in ",[632,959,960],{},"cryptoShredding"," helper is on the ",[764,963,967],{"href":964,"rel":965},"https:\u002F\u002Fgithub.com\u002Fevloghq\u002Fevlog\u002Fissues",[966],"nofollow","follow-up roadmap",[617,969,971],{"id":970},"retention","Retention",[604,973,974],{},"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:",[976,977,978,991],"table",{},[979,980,981],"thead",{},[982,983,984,988],"tr",{},[985,986,987],"th",{},"Drain",[985,989,990],{},"Retention mechanism",[992,993,994,1007,1018,1026],"tbody",{},[982,995,996,1000],{},[997,998,999],"td",{},"FS",[997,1001,1002,1003,1006],{},"Combine ",[632,1004,1005],{},"createFsDrain({ maxFiles })"," with a daily compactor.",[982,1008,1009,1012],{},[997,1010,1011],{},"Postgres",[997,1013,1014,1015,857],{},"Schedule ",[632,1016,1017],{},"DELETE FROM audit_events WHERE timestamp \u003C now() - interval '7 years'",[982,1019,1020,1023],{},[997,1021,1022],{},"Axiom \u002F Datadog \u002F Loki",[997,1024,1025],{},"Set the dataset retention policy in the platform.",[982,1027,1028,1031],{},[997,1029,1030],{},"S3 Object Lock",[997,1032,1033],{},"Configure lifecycle rules + Object Lock retention period.",[604,1035,1036],{},"Document the chosen window in your security policy. Auditors care about the written rule, not the enforcing component.",[617,1038,1040],{"id":1039},"common-pitfalls","Common Pitfalls",[1042,1043,1044,1057,1080,1086,1105,1119],"ul",{},[946,1045,1046,1049,1050,751,1053,1056],{},[608,1047,1048],{},"Logging only successes."," Auditors care most about denials. Always pair ",[632,1051,1052],{},"log.audit()",[632,1054,1055],{},"log.audit.deny()"," on the negative branch of every authorisation check.",[946,1058,1059,1065,1066,1069,1070,1072,1073,897,1075,897,1077,1079],{},[608,1060,1061,1062,857],{},"Leaking PII through ",[632,1063,1064],{},"changes"," ",[632,1067,1068],{},"auditDiff()"," runs through your ",[632,1071,778],{},", but only if the field paths are listed. Add ",[632,1074,907],{},[632,1076,910],{},[632,1078,913],{},", etc. once globally so you never have to think about it again.",[946,1081,1082,1085],{},[608,1083,1084],{},"Treating audits as observability."," Don't sample, downsample, or summarise audit events. Force-keep is on by default. Do not disable it.",[946,1087,1088,1065,1095,1097,1098,931,1101,1104],{},[608,1089,1090,1091,1094],{},"Conflating ",[632,1092,1093],{},"actor.id"," with the session id.",[632,1096,1093],{}," is the stable user id (or system identity). Correlate sessions via ",[632,1099,1100],{},"context.requestId",[632,1102,1103],{},"context.traceId",", never via the actor.",[946,1106,1107,1110,1111,1114,1115,1118],{},[608,1108,1109],{},"Forgetting standalone jobs."," Cron tasks, queue workers, and CLIs trigger audit-worthy actions too. Use ",[632,1112,1113],{},"audit()"," (no request) or ",[632,1116,1117],{},"withAudit()"," to keep coverage parity with your HTTP routes.",[946,1120,1121,1128],{},[608,1122,1123,1124,1127],{},"Skipping ",[632,1125,1126],{},"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.",[1130,1131,1132],"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":630,"searchDepth":649,"depth":649,"links":1134},[1135,1136,1137,1138,1139],{"id":619,"depth":649,"text":620},{"id":771,"depth":649,"text":772},{"id":937,"depth":649,"text":938},{"id":970,"depth":649,"text":971},{"id":1039,"depth":649,"text":1040},"Integrity, redact presets, GDPR vs append-only, retention windows, and the most common pitfalls when shipping audit logs to production.","md",[1143,1146],{"label":767,"icon":409,"to":407,"color":1144,"variant":1145},"neutral","subtle",{"label":415,"icon":84,"to":416,"color":1144,"variant":1145},{},{"title":411,"icon":388},{"title":411,"description":1140},"eaty2Zo1S4rASyAl6Gj6gIQlclu1msskU-4fakBhs0c",[1152,1154],{"title":406,"path":407,"stem":408,"description":1153,"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":1155,"icon":84,"children":-1},"File system, Axiom, and Postgres recipes for audit logs, plus mockAudit for tests and the full API reference.",1789076908964]