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Skip it and ship a custom enricher if your strategy differs.",[616,617,623],"pre",{"className":618,"code":619,"filename":620,"language":621,"meta":622,"style":622},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { auditEnricher } from 'evlog'\n\nnitro.hooks.hook('evlog:enrich', auditEnricher())\n","server\u002Fplugins\u002Fevlog.ts","typescript","",[587,624,625,658,665],{"__ignoreMap":622},[626,627,630,634,638,642,645,648,651,655],"span",{"class":628,"line":629},"line",1,[626,631,633],{"class":632},"s7zQu","import",[626,635,637],{"class":636},"sMK4o"," {",[626,639,641],{"class":640},"sTEyZ"," auditEnricher",[626,643,644],{"class":636}," }",[626,646,647],{"class":632}," from",[626,649,650],{"class":636}," '",[626,652,654],{"class":653},"sfazB","evlog",[626,656,657],{"class":636},"'\n",[626,659,661],{"class":628,"line":660},2,[626,662,664],{"emptyLinePlaceholder":663},true,"\n",[626,666,668,671,674,677,679,683,686,689,692,694,697,699],{"class":628,"line":667},3,[626,669,670],{"class":640},"nitro",[626,672,673],{"class":636},".",[626,675,676],{"class":640},"hooks",[626,678,673],{"class":636},[626,680,682],{"class":681},"s2Zo4","hook",[626,684,685],{"class":640},"(",[626,687,688],{"class":636},"'",[626,690,691],{"class":653},"evlog:enrich",[626,693,688],{"class":636},[626,695,696],{"class":636},",",[626,698,641],{"class":681},[626,700,701],{"class":640},"())\n",[583,703,704],{},"For multi-tenant apps and custom session bridges, pass options:",[616,706,708],{"className":618,"code":707,"language":621,"meta":622,"style":622},"nitro.hooks.hook('evlog:enrich', auditEnricher({\n  tenantId: ctx => ctx.event.tenant as string | undefined,\n  bridge: { getSession: async ctx => readSessionActor(ctx.headers) },\n}))\n",[587,709,710,739,783,819],{"__ignoreMap":622},[626,711,712,714,716,718,720,722,724,726,728,730,732,734,736],{"class":628,"line":629},[626,713,670],{"class":640},[626,715,673],{"class":636},[626,717,676],{"class":640},[626,719,673],{"class":636},[626,721,682],{"class":681},[626,723,685],{"class":640},[626,725,688],{"class":636},[626,727,691],{"class":653},[626,729,688],{"class":636},[626,731,696],{"class":636},[626,733,641],{"class":681},[626,735,685],{"class":640},[626,737,738],{"class":636},"{\n",[626,740,741,744,747,751,755,757,759,762,764,767,770,774,777,780],{"class":628,"line":660},[626,742,743],{"class":681},"  tenantId",[626,745,746],{"class":636},":",[626,748,750],{"class":749},"sHdIc"," ctx",[626,752,754],{"class":753},"spNyl"," =>",[626,756,750],{"class":640},[626,758,673],{"class":636},[626,760,761],{"class":640},"event",[626,763,673],{"class":636},[626,765,766],{"class":640},"tenant ",[626,768,769],{"class":632},"as",[626,771,773],{"class":772},"sBMFI"," string",[626,775,776],{"class":636}," |",[626,778,779],{"class":772}," undefined",[626,781,782],{"class":636},",\n",[626,784,785,789,791,793,796,798,801,803,805,808,811,813,816],{"class":628,"line":667},[626,786,788],{"class":787},"swJcz","  bridge",[626,790,746],{"class":636},[626,792,637],{"class":636},[626,794,795],{"class":681}," getSession",[626,797,746],{"class":636},[626,799,800],{"class":753}," async",[626,802,750],{"class":749},[626,804,754],{"class":753},[626,806,807],{"class":681}," readSessionActor",[626,809,810],{"class":640},"(ctx",[626,812,673],{"class":636},[626,814,815],{"class":640},"headers) ",[626,817,818],{"class":636},"},\n",[626,820,822,825],{"class":628,"line":821},4,[626,823,824],{"class":636},"}",[626,826,827],{"class":640},"))\n",[583,829,830,831,833,834,837,838,841,842,845],{},"Without ",[587,832,589],{},", ",[587,835,836],{},"audit.context"," stays empty, and auditors and incident responders need at least ",[587,839,840],{},"requestId"," and ",[587,843,844],{},"ip"," to triangulate a recorded action.",[600,847,849],{"id":848},"auditonly",[587,850,851],{},"auditOnly()",[853,854,855,859,860,863,864,867,868,871],"tip",{},[856,857,858],"strong",{},"Why filter audits to a separate drain?"," Three reasons: ",[856,861,862],{},"cost"," (audit volume is tiny next to product telemetry, so keep them separate and retention costs don't explode), ",[856,865,866],{},"permissions"," (the audit dataset should be read-only for engineers and write-only for the app), and ",[856,869,870],{},"retention"," (audits often live 7+ years; product logs rarely live more than 90 days).",[583,873,874,877,878,881,882,885],{},[587,875,876],{},"auditOnly(drain)"," only forwards events with an ",[587,879,880],{},"audit"," field. Compose with ",[856,883,884],{},"any"," drain:",[616,887,889],{"className":618,"code":888,"language":621,"meta":622,"style":622},"import { auditOnly } from 'evlog'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\n\n\u002F\u002F Send audits to a dedicated Axiom dataset:\nnitro.hooks.hook('evlog:drain', auditOnly(\n  createAxiomDrain({ dataset: 'audit', apiKey: process.env.AXIOM_AUDIT_API_KEY }),\n))\n",[587,890,891,910,930,934,940,969,1018],{"__ignoreMap":622},[626,892,893,895,897,900,902,904,906,908],{"class":628,"line":629},[626,894,633],{"class":632},[626,896,637],{"class":636},[626,898,899],{"class":640}," auditOnly",[626,901,644],{"class":636},[626,903,647],{"class":632},[626,905,650],{"class":636},[626,907,654],{"class":653},[626,909,657],{"class":636},[626,911,912,914,916,919,921,923,925,928],{"class":628,"line":660},[626,913,633],{"class":632},[626,915,637],{"class":636},[626,917,918],{"class":640}," createAxiomDrain",[626,920,644],{"class":636},[626,922,647],{"class":632},[626,924,650],{"class":636},[626,926,927],{"class":653},"evlog\u002Faxiom",[626,929,657],{"class":636},[626,931,932],{"class":628,"line":667},[626,933,664],{"emptyLinePlaceholder":663},[626,935,936],{"class":628,"line":821},[626,937,939],{"class":938},"sHwdD","\u002F\u002F Send audits to a dedicated Axiom dataset:\n",[626,941,943,945,947,949,951,953,955,957,960,962,964,966],{"class":628,"line":942},5,[626,944,670],{"class":640},[626,946,673],{"class":636},[626,948,676],{"class":640},[626,950,673],{"class":636},[626,952,682],{"class":681},[626,954,685],{"class":640},[626,956,688],{"class":636},[626,958,959],{"class":653},"evlog:drain",[626,961,688],{"class":636},[626,963,696],{"class":636},[626,965,899],{"class":681},[626,967,968],{"class":640},"(\n",[626,970,972,975,977,980,983,985,987,989,991,993,996,998,1001,1003,1006,1008,1011,1013,1016],{"class":628,"line":971},6,[626,973,974],{"class":681},"  createAxiomDrain",[626,976,685],{"class":640},[626,978,979],{"class":636},"{",[626,981,982],{"class":787}," dataset",[626,984,746],{"class":636},[626,986,650],{"class":636},[626,988,880],{"class":653},[626,990,688],{"class":636},[626,992,696],{"class":636},[626,994,995],{"class":787}," apiKey",[626,997,746],{"class":636},[626,999,1000],{"class":640}," process",[626,1002,673],{"class":636},[626,1004,1005],{"class":640},"env",[626,1007,673],{"class":636},[626,1009,1010],{"class":640},"AXIOM_AUDIT_API_KEY ",[626,1012,824],{"class":636},[626,1014,1015],{"class":640},")",[626,1017,782],{"class":636},[626,1019,1021],{"class":628,"line":1020},7,[626,1022,827],{"class":640},[583,1024,1025,1026,1029],{},"Set ",[587,1027,1028],{},"await: true"," to make audit writes synchronous (no fire-and-forget for audits, so crash-safe by default):",[616,1031,1033],{"className":618,"code":1032,"language":621,"meta":622,"style":622},"auditOnly(createFsDrain({ dir: '.audit' }), { await: true })\n",[587,1034,1035],{"__ignoreMap":622},[626,1036,1037,1039,1041,1044,1046,1048,1051,1053,1055,1058,1060,1062,1064,1066,1068,1071,1073,1077,1079],{"class":628,"line":629},[626,1038,593],{"class":681},[626,1040,685],{"class":640},[626,1042,1043],{"class":681},"createFsDrain",[626,1045,685],{"class":640},[626,1047,979],{"class":636},[626,1049,1050],{"class":787}," dir",[626,1052,746],{"class":636},[626,1054,650],{"class":636},[626,1056,1057],{"class":653},".audit",[626,1059,688],{"class":636},[626,1061,644],{"class":636},[626,1063,1015],{"class":640},[626,1065,696],{"class":636},[626,1067,637],{"class":636},[626,1069,1070],{"class":787}," await",[626,1072,746],{"class":636},[626,1074,1076],{"class":1075},"sfNiH"," true",[626,1078,644],{"class":636},[626,1080,1081],{"class":640},")\n",[583,1083,1084,1085,1087],{},"The ",[587,1086,1028],{}," flag costs you a small bit of latency per request that records an audit (one synchronous drain call), but guarantees the audit hits disk before the response is sent. For compliance-grade audits, the trade-off is always worth it.",[600,1089,1090],{"id":597},[587,1091,1092],{},"signed()",[583,1094,1095,1098],{},[587,1096,1097],{},"signed(drain, opts)"," adds tamper-evident integrity. Two strategies:",[1100,1101,1102,1118],"table",{},[1103,1104,1105],"thead",{},[1106,1107,1108,1112,1115],"tr",{},[1109,1110,1111],"th",{},"Strategy",[1109,1113,1114],{},"What it adds",[1109,1116,1117],{},"Use case",[1119,1120,1121,1138],"tbody",{},[1106,1122,1123,1129,1135],{},[1124,1125,1126],"td",{},[587,1127,1128],{},"'hmac'",[1124,1130,1131,1134],{},[587,1132,1133],{},"event.audit.signature"," (HMAC of the canonical event)",[1124,1136,1137],{},"Single-event integrity check (any later mutation fails verification).",[1106,1139,1140,1145,1153],{},[1124,1141,1142],{},[587,1143,1144],{},"'hash-chain'",[1124,1146,1147,841,1150],{},[587,1148,1149],{},"event.audit.prevHash",[587,1151,1152],{},"event.audit.hash",[1124,1154,1155],{},"A verifiable chain — deletions and reordering also become detectable.",[853,1157,1158,1164,1165,1169,1170,1172],{},[856,1159,1160,1161,1163],{},"What ",[587,1162,1092],{}," actually buys you."," Detection, not prevention. Anyone with write access to the underlying drain can still nuke the file or table, but the chain proves ",[1166,1167,1168],"em",{},"which"," events were dropped or modified after the fact. Skip ",[587,1171,1092],{}," if you already write to an append-only \u002F WORM store (S3 Object Lock, Postgres with row-level immutability, BigQuery append-only tables); doubling integrity layers just adds latency without raising the bar.",[1174,1175,1177],"h3",{"id":1176},"hmac","HMAC",[583,1179,1180],{},"Each event gets a signature. Tampering with one row breaks that row's verification, but doesn't break later rows.",[616,1182,1184],{"className":618,"code":1183,"language":621,"meta":622,"style":622},"import { signed } from 'evlog'\n\nsigned(drain, { strategy: 'hmac', secret: process.env.AUDIT_SECRET! })\n",[587,1185,1186,1205,1209],{"__ignoreMap":622},[626,1187,1188,1190,1192,1195,1197,1199,1201,1203],{"class":628,"line":629},[626,1189,633],{"class":632},[626,1191,637],{"class":636},[626,1193,1194],{"class":640}," signed",[626,1196,644],{"class":636},[626,1198,647],{"class":632},[626,1200,650],{"class":636},[626,1202,654],{"class":653},[626,1204,657],{"class":636},[626,1206,1207],{"class":628,"line":660},[626,1208,664],{"emptyLinePlaceholder":663},[626,1210,1211,1213,1216,1218,1220,1223,1225,1227,1229,1231,1233,1236,1238,1240,1242,1244,1246,1249,1252,1254],{"class":628,"line":667},[626,1212,597],{"class":681},[626,1214,1215],{"class":640},"(drain",[626,1217,696],{"class":636},[626,1219,637],{"class":636},[626,1221,1222],{"class":787}," strategy",[626,1224,746],{"class":636},[626,1226,650],{"class":636},[626,1228,1176],{"class":653},[626,1230,688],{"class":636},[626,1232,696],{"class":636},[626,1234,1235],{"class":787}," secret",[626,1237,746],{"class":636},[626,1239,1000],{"class":640},[626,1241,673],{"class":636},[626,1243,1005],{"class":640},[626,1245,673],{"class":636},[626,1247,1248],{"class":640},"AUDIT_SECRET",[626,1250,1251],{"class":636},"!",[626,1253,644],{"class":636},[626,1255,1081],{"class":640},[1174,1257,1259],{"id":1258},"hash-chain","Hash-chain",[583,1261,1262],{},"Each event references the previous event's hash. Deleting any row breaks the chain forward of that point, so the verifier can pinpoint the exact row that was tampered with.",[616,1264,1266],{"className":618,"code":1265,"language":621,"meta":622,"style":622},"signed(drain, {\n  strategy: 'hash-chain',\n  state: {\n    load: () => fs.readFile('.audit\u002Fhead', 'utf8').catch(() => null),\n    save: (h) => fs.writeFile('.audit\u002Fhead', h),\n  },\n})\n",[587,1267,1268,1279,1294,1303,1362,1401,1406],{"__ignoreMap":622},[626,1269,1270,1272,1274,1276],{"class":628,"line":629},[626,1271,597],{"class":681},[626,1273,1215],{"class":640},[626,1275,696],{"class":636},[626,1277,1278],{"class":636}," {\n",[626,1280,1281,1284,1286,1288,1290,1292],{"class":628,"line":660},[626,1282,1283],{"class":787},"  strategy",[626,1285,746],{"class":636},[626,1287,650],{"class":636},[626,1289,1258],{"class":653},[626,1291,688],{"class":636},[626,1293,782],{"class":636},[626,1295,1296,1299,1301],{"class":628,"line":667},[626,1297,1298],{"class":787},"  state",[626,1300,746],{"class":636},[626,1302,1278],{"class":636},[626,1304,1305,1308,1310,1313,1315,1318,1320,1323,1325,1327,1330,1332,1334,1336,1339,1341,1343,1345,1348,1350,1353,1355,1358,1360],{"class":628,"line":821},[626,1306,1307],{"class":681},"    load",[626,1309,746],{"class":636},[626,1311,1312],{"class":636}," ()",[626,1314,754],{"class":753},[626,1316,1317],{"class":640}," fs",[626,1319,673],{"class":636},[626,1321,1322],{"class":681},"readFile",[626,1324,685],{"class":640},[626,1326,688],{"class":636},[626,1328,1329],{"class":653},".audit\u002Fhead",[626,1331,688],{"class":636},[626,1333,696],{"class":636},[626,1335,650],{"class":636},[626,1337,1338],{"class":653},"utf8",[626,1340,688],{"class":636},[626,1342,1015],{"class":640},[626,1344,673],{"class":636},[626,1346,1347],{"class":681},"catch",[626,1349,685],{"class":640},[626,1351,1352],{"class":636},"()",[626,1354,754],{"class":753},[626,1356,1357],{"class":636}," null",[626,1359,1015],{"class":640},[626,1361,782],{"class":636},[626,1363,1364,1367,1369,1372,1375,1377,1379,1381,1383,1386,1388,1390,1392,1394,1396,1399],{"class":628,"line":942},[626,1365,1366],{"class":681},"    save",[626,1368,746],{"class":636},[626,1370,1371],{"class":636}," (",[626,1373,1374],{"class":749},"h",[626,1376,1015],{"class":636},[626,1378,754],{"class":753},[626,1380,1317],{"class":640},[626,1382,673],{"class":636},[626,1384,1385],{"class":681},"writeFile",[626,1387,685],{"class":640},[626,1389,688],{"class":636},[626,1391,1329],{"class":653},[626,1393,688],{"class":636},[626,1395,696],{"class":636},[626,1397,1398],{"class":640}," h)",[626,1400,782],{"class":636},[626,1402,1403],{"class":628,"line":971},[626,1404,1405],{"class":636},"  },\n",[626,1407,1408,1410],{"class":628,"line":1020},[626,1409,824],{"class":636},[626,1411,1081],{"class":640},[583,1413,1084,1414,1417],{},[587,1415,1416],{},"state"," config is required for cross-process or durable chains: load the previous head hash from your own store (Redis, Postgres, file) before each event, save the new head after.",[1419,1420],"hash-chain-tamper",{},[1422,1423,1424,1425,1428,1429,1432,1433,673],"note",{},"A CLI to walk and verify the chain (",[587,1426,1427],{},"evlog audit verify",") is on the roadmap. 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