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Each is opt-in and replaceable.",[622,623,625],"h2",{"id":624},"auditenricher",[609,626,627],{},"auditEnricher()",[605,629,630,632,633,636],{},[609,631,627],{}," populates ",[609,634,635],{},"event.audit.context.{requestId, traceId, ip, userAgent, tenantId}",". Skip it and ship a custom enricher if your strategy differs.",[638,639,645],"pre",{"className":640,"code":641,"filename":642,"language":643,"meta":644,"style":644},"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","",[609,646,647,680,687],{"__ignoreMap":644},[648,649,652,656,660,664,667,670,673,677],"span",{"class":650,"line":651},"line",1,[648,653,655],{"class":654},"s7zQu","import",[648,657,659],{"class":658},"sMK4o"," {",[648,661,663],{"class":662},"sTEyZ"," auditEnricher",[648,665,666],{"class":658}," }",[648,668,669],{"class":654}," from",[648,671,672],{"class":658}," '",[648,674,676],{"class":675},"sfazB","evlog",[648,678,679],{"class":658},"'\n",[648,681,683],{"class":650,"line":682},2,[648,684,686],{"emptyLinePlaceholder":685},true,"\n",[648,688,690,693,696,699,701,705,708,711,714,716,719,721],{"class":650,"line":689},3,[648,691,692],{"class":662},"nitro",[648,694,695],{"class":658},".",[648,697,698],{"class":662},"hooks",[648,700,695],{"class":658},[648,702,704],{"class":703},"s2Zo4","hook",[648,706,707],{"class":662},"(",[648,709,710],{"class":658},"'",[648,712,713],{"class":675},"evlog:enrich",[648,715,710],{"class":658},[648,717,718],{"class":658},",",[648,720,663],{"class":703},[648,722,723],{"class":662},"())\n",[605,725,726],{},"For multi-tenant apps and custom session bridges, pass options:",[638,728,730],{"className":640,"code":729,"language":643,"meta":644,"style":644},"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",[609,731,732,761,805,841],{"__ignoreMap":644},[648,733,734,736,738,740,742,744,746,748,750,752,754,756,758],{"class":650,"line":651},[648,735,692],{"class":662},[648,737,695],{"class":658},[648,739,698],{"class":662},[648,741,695],{"class":658},[648,743,704],{"class":703},[648,745,707],{"class":662},[648,747,710],{"class":658},[648,749,713],{"class":675},[648,751,710],{"class":658},[648,753,718],{"class":658},[648,755,663],{"class":703},[648,757,707],{"class":662},[648,759,760],{"class":658},"{\n",[648,762,763,766,769,773,777,779,781,784,786,789,792,796,799,802],{"class":650,"line":682},[648,764,765],{"class":703},"  tenantId",[648,767,768],{"class":658},":",[648,770,772],{"class":771},"sHdIc"," ctx",[648,774,776],{"class":775},"spNyl"," =>",[648,778,772],{"class":662},[648,780,695],{"class":658},[648,782,783],{"class":662},"event",[648,785,695],{"class":658},[648,787,788],{"class":662},"tenant ",[648,790,791],{"class":654},"as",[648,793,795],{"class":794},"sBMFI"," string",[648,797,798],{"class":658}," |",[648,800,801],{"class":794}," undefined",[648,803,804],{"class":658},",\n",[648,806,807,811,813,815,818,820,823,825,827,830,833,835,838],{"class":650,"line":689},[648,808,810],{"class":809},"swJcz","  bridge",[648,812,768],{"class":658},[648,814,659],{"class":658},[648,816,817],{"class":703}," getSession",[648,819,768],{"class":658},[648,821,822],{"class":775}," async",[648,824,772],{"class":771},[648,826,776],{"class":775},[648,828,829],{"class":703}," readSessionActor",[648,831,832],{"class":662},"(ctx",[648,834,695],{"class":658},[648,836,837],{"class":662},"headers) ",[648,839,840],{"class":658},"},\n",[648,842,844,847],{"class":650,"line":843},4,[648,845,846],{"class":658},"}",[648,848,849],{"class":662},"))\n",[605,851,852,853,855,856,859,860,863,864,867],{},"Without ",[609,854,611],{},", ",[609,857,858],{},"audit.context"," stays empty, and auditors and incident responders need at least ",[609,861,862],{},"requestId"," and ",[609,865,866],{},"ip"," to triangulate a recorded action.",[622,869,871],{"id":870},"auditonly",[609,872,873],{},"auditOnly()",[875,876,877,881,882,885,886,889,890,893],"tip",{},[878,879,880],"strong",{},"Why filter audits to a separate drain?"," Three reasons: ",[878,883,884],{},"cost"," (audit volume is tiny next to product telemetry, so keep them separate and retention costs don't explode), ",[878,887,888],{},"permissions"," (the audit dataset should be read-only for engineers and write-only for the app), and ",[878,891,892],{},"retention"," (audits often live 7+ years; product logs rarely live more than 90 days).",[605,895,896,899,900,903,904,907],{},[609,897,898],{},"auditOnly(drain)"," only forwards events with an ",[609,901,902],{},"audit"," field. Compose with ",[878,905,906],{},"any"," drain:",[638,909,911],{"className":640,"code":910,"language":643,"meta":644,"style":644},"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",[609,912,913,932,952,956,962,991,1040],{"__ignoreMap":644},[648,914,915,917,919,922,924,926,928,930],{"class":650,"line":651},[648,916,655],{"class":654},[648,918,659],{"class":658},[648,920,921],{"class":662}," auditOnly",[648,923,666],{"class":658},[648,925,669],{"class":654},[648,927,672],{"class":658},[648,929,676],{"class":675},[648,931,679],{"class":658},[648,933,934,936,938,941,943,945,947,950],{"class":650,"line":682},[648,935,655],{"class":654},[648,937,659],{"class":658},[648,939,940],{"class":662}," createAxiomDrain",[648,942,666],{"class":658},[648,944,669],{"class":654},[648,946,672],{"class":658},[648,948,949],{"class":675},"evlog\u002Faxiom",[648,951,679],{"class":658},[648,953,954],{"class":650,"line":689},[648,955,686],{"emptyLinePlaceholder":685},[648,957,958],{"class":650,"line":843},[648,959,961],{"class":960},"sHwdD","\u002F\u002F Send audits to a dedicated Axiom dataset:\n",[648,963,965,967,969,971,973,975,977,979,982,984,986,988],{"class":650,"line":964},5,[648,966,692],{"class":662},[648,968,695],{"class":658},[648,970,698],{"class":662},[648,972,695],{"class":658},[648,974,704],{"class":703},[648,976,707],{"class":662},[648,978,710],{"class":658},[648,980,981],{"class":675},"evlog:drain",[648,983,710],{"class":658},[648,985,718],{"class":658},[648,987,921],{"class":703},[648,989,990],{"class":662},"(\n",[648,992,994,997,999,1002,1005,1007,1009,1011,1013,1015,1018,1020,1023,1025,1028,1030,1033,1035,1038],{"class":650,"line":993},6,[648,995,996],{"class":703},"  createAxiomDrain",[648,998,707],{"class":662},[648,1000,1001],{"class":658},"{",[648,1003,1004],{"class":809}," dataset",[648,1006,768],{"class":658},[648,1008,672],{"class":658},[648,1010,902],{"class":675},[648,1012,710],{"class":658},[648,1014,718],{"class":658},[648,1016,1017],{"class":809}," apiKey",[648,1019,768],{"class":658},[648,1021,1022],{"class":662}," process",[648,1024,695],{"class":658},[648,1026,1027],{"class":662},"env",[648,1029,695],{"class":658},[648,1031,1032],{"class":662},"AXIOM_AUDIT_API_KEY ",[648,1034,846],{"class":658},[648,1036,1037],{"class":662},")",[648,1039,804],{"class":658},[648,1041,1043],{"class":650,"line":1042},7,[648,1044,849],{"class":662},[605,1046,1047,1048,1051],{},"Set ",[609,1049,1050],{},"await: true"," to make audit writes synchronous (no fire-and-forget for audits, so crash-safe by default):",[638,1053,1055],{"className":640,"code":1054,"language":643,"meta":644,"style":644},"auditOnly(createFsDrain({ dir: '.audit' }), { await: true })\n",[609,1056,1057],{"__ignoreMap":644},[648,1058,1059,1061,1063,1066,1068,1070,1073,1075,1077,1080,1082,1084,1086,1088,1090,1093,1095,1099,1101],{"class":650,"line":651},[648,1060,615],{"class":703},[648,1062,707],{"class":662},[648,1064,1065],{"class":703},"createFsDrain",[648,1067,707],{"class":662},[648,1069,1001],{"class":658},[648,1071,1072],{"class":809}," dir",[648,1074,768],{"class":658},[648,1076,672],{"class":658},[648,1078,1079],{"class":675},".audit",[648,1081,710],{"class":658},[648,1083,666],{"class":658},[648,1085,1037],{"class":662},[648,1087,718],{"class":658},[648,1089,659],{"class":658},[648,1091,1092],{"class":809}," await",[648,1094,768],{"class":658},[648,1096,1098],{"class":1097},"sfNiH"," true",[648,1100,666],{"class":658},[648,1102,1103],{"class":662},")\n",[605,1105,1106,1107,1109],{},"The ",[609,1108,1050],{}," 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.",[622,1111,1112],{"id":619},[609,1113,1114],{},"signed()",[605,1116,1117,1120],{},[609,1118,1119],{},"signed(drain, opts)"," adds tamper-evident integrity. Two strategies:",[1122,1123,1124,1140],"table",{},[1125,1126,1127],"thead",{},[1128,1129,1130,1134,1137],"tr",{},[1131,1132,1133],"th",{},"Strategy",[1131,1135,1136],{},"What it adds",[1131,1138,1139],{},"Use case",[1141,1142,1143,1160],"tbody",{},[1128,1144,1145,1151,1157],{},[1146,1147,1148],"td",{},[609,1149,1150],{},"'hmac'",[1146,1152,1153,1156],{},[609,1154,1155],{},"event.audit.signature"," (HMAC of the canonical event)",[1146,1158,1159],{},"Single-event integrity check (any later mutation fails verification).",[1128,1161,1162,1167,1175],{},[1146,1163,1164],{},[609,1165,1166],{},"'hash-chain'",[1146,1168,1169,863,1172],{},[609,1170,1171],{},"event.audit.prevHash",[609,1173,1174],{},"event.audit.hash",[1146,1176,1177],{},"A verifiable chain — deletions and reordering also become detectable.",[875,1179,1180,1186,1187,1191,1192,1194],{},[878,1181,1182,1183,1185],{},"What ",[609,1184,1114],{}," 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 ",[1188,1189,1190],"em",{},"which"," events were dropped or modified after the fact. Skip ",[609,1193,1114],{}," 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.",[1196,1197,1199],"h3",{"id":1198},"hmac","HMAC",[605,1201,1202],{},"Each event gets a signature. Tampering with one row breaks that row's verification, but doesn't break later rows.",[638,1204,1206],{"className":640,"code":1205,"language":643,"meta":644,"style":644},"import { signed } from 'evlog'\n\nsigned(drain, { strategy: 'hmac', secret: process.env.AUDIT_SECRET! })\n",[609,1207,1208,1227,1231],{"__ignoreMap":644},[648,1209,1210,1212,1214,1217,1219,1221,1223,1225],{"class":650,"line":651},[648,1211,655],{"class":654},[648,1213,659],{"class":658},[648,1215,1216],{"class":662}," signed",[648,1218,666],{"class":658},[648,1220,669],{"class":654},[648,1222,672],{"class":658},[648,1224,676],{"class":675},[648,1226,679],{"class":658},[648,1228,1229],{"class":650,"line":682},[648,1230,686],{"emptyLinePlaceholder":685},[648,1232,1233,1235,1238,1240,1242,1245,1247,1249,1251,1253,1255,1258,1260,1262,1264,1266,1268,1271,1274,1276],{"class":650,"line":689},[648,1234,619],{"class":703},[648,1236,1237],{"class":662},"(drain",[648,1239,718],{"class":658},[648,1241,659],{"class":658},[648,1243,1244],{"class":809}," strategy",[648,1246,768],{"class":658},[648,1248,672],{"class":658},[648,1250,1198],{"class":675},[648,1252,710],{"class":658},[648,1254,718],{"class":658},[648,1256,1257],{"class":809}," secret",[648,1259,768],{"class":658},[648,1261,1022],{"class":662},[648,1263,695],{"class":658},[648,1265,1027],{"class":662},[648,1267,695],{"class":658},[648,1269,1270],{"class":662},"AUDIT_SECRET",[648,1272,1273],{"class":658},"!",[648,1275,666],{"class":658},[648,1277,1103],{"class":662},[1196,1279,1281],{"id":1280},"hash-chain","Hash-chain",[605,1283,1284],{},"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.",[638,1286,1288],{"className":640,"code":1287,"language":643,"meta":644,"style":644},"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",[609,1289,1290,1301,1316,1325,1384,1423,1428],{"__ignoreMap":644},[648,1291,1292,1294,1296,1298],{"class":650,"line":651},[648,1293,619],{"class":703},[648,1295,1237],{"class":662},[648,1297,718],{"class":658},[648,1299,1300],{"class":658}," {\n",[648,1302,1303,1306,1308,1310,1312,1314],{"class":650,"line":682},[648,1304,1305],{"class":809},"  strategy",[648,1307,768],{"class":658},[648,1309,672],{"class":658},[648,1311,1280],{"class":675},[648,1313,710],{"class":658},[648,1315,804],{"class":658},[648,1317,1318,1321,1323],{"class":650,"line":689},[648,1319,1320],{"class":809},"  state",[648,1322,768],{"class":658},[648,1324,1300],{"class":658},[648,1326,1327,1330,1332,1335,1337,1340,1342,1345,1347,1349,1352,1354,1356,1358,1361,1363,1365,1367,1370,1372,1375,1377,1380,1382],{"class":650,"line":843},[648,1328,1329],{"class":703},"    load",[648,1331,768],{"class":658},[648,1333,1334],{"class":658}," ()",[648,1336,776],{"class":775},[648,1338,1339],{"class":662}," fs",[648,1341,695],{"class":658},[648,1343,1344],{"class":703},"readFile",[648,1346,707],{"class":662},[648,1348,710],{"class":658},[648,1350,1351],{"class":675},".audit\u002Fhead",[648,1353,710],{"class":658},[648,1355,718],{"class":658},[648,1357,672],{"class":658},[648,1359,1360],{"class":675},"utf8",[648,1362,710],{"class":658},[648,1364,1037],{"class":662},[648,1366,695],{"class":658},[648,1368,1369],{"class":703},"catch",[648,1371,707],{"class":662},[648,1373,1374],{"class":658},"()",[648,1376,776],{"class":775},[648,1378,1379],{"class":658}," null",[648,1381,1037],{"class":662},[648,1383,804],{"class":658},[648,1385,1386,1389,1391,1394,1397,1399,1401,1403,1405,1408,1410,1412,1414,1416,1418,1421],{"class":650,"line":964},[648,1387,1388],{"class":703},"    save",[648,1390,768],{"class":658},[648,1392,1393],{"class":658}," (",[648,1395,1396],{"class":771},"h",[648,1398,1037],{"class":658},[648,1400,776],{"class":775},[648,1402,1339],{"class":662},[648,1404,695],{"class":658},[648,1406,1407],{"class":703},"writeFile",[648,1409,707],{"class":662},[648,1411,710],{"class":658},[648,1413,1351],{"class":675},[648,1415,710],{"class":658},[648,1417,718],{"class":658},[648,1419,1420],{"class":662}," h)",[648,1422,804],{"class":658},[648,1424,1425],{"class":650,"line":993},[648,1426,1427],{"class":658},"  },\n",[648,1429,1430,1432],{"class":650,"line":1042},[648,1431,846],{"class":658},[648,1433,1103],{"class":662},[605,1435,1106,1436,1439],{},[609,1437,1438],{},"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.",[1441,1442],"hash-chain-tamper",{},[1444,1445,1446,1447,1450,1451,1454,1455,695],"note",{},"A CLI to walk and verify the chain (",[609,1448,1449],{},"evlog audit verify",") is on the roadmap. 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