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signed",[486,595,572],{"class":500},[486,597,598],{"class":568},"createFsDrain",[486,600,572],{"class":500},[486,602,603],{"class":496},"{",[486,605,607],{"class":606},"swJcz"," dir",[486,609,610],{"class":496},":",[486,612,516],{"class":496},[486,614,615],{"class":519},".audit",[486,617,575],{"class":496},[486,619,504],{"class":496},[486,621,622],{"class":606}," maxFiles",[486,624,610],{"class":496},[486,626,628],{"class":627},"sbssI"," 30",[486,630,510],{"class":496},[486,632,633],{"class":500},")",[486,635,504],{"class":496},[486,637,497],{"class":496},[486,639,640],{"class":606}," strategy",[486,642,610],{"class":496},[486,644,516],{"class":496},[486,646,647],{"class":519},"hash-chain",[486,649,575],{"class":496},[486,651,510],{"class":496},[486,653,633],{"class":500},[486,655,656],{"class":496},",\n",[486,658,660,663,666,668,672],{"class":488,"line":659},6,[486,661,662],{"class":496},"  {",[486,664,665],{"class":606}," await",[486,667,610],{"class":496},[486,669,671],{"class":670},"sfNiH"," true",[486,673,674],{"class":496}," },\n",[486,676,678],{"class":488,"line":677},7,[486,679,680],{"class":500},"))\n",[476,682,687],{"className":683,"code":684,"filename":685,"language":686,"meta":482,"style":482},"language-ndjson shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","{\"audit\":{\"action\":\"invoice.refund\",\"actor\":{\"type\":\"user\",\"id\":\"usr_42\"},\"target\":{\"type\":\"invoice\",\"id\":\"inv_889\"},\"outcome\":\"success\",\"version\":1,\"idempotencyKey\":\"ak_8f3c4b2a1e5d6f7c\",\"prevHash\":null,\"hash\":\"3f2c8e1a...\"}}\n{\"audit\":{\"action\":\"user.update\",\"actor\":{\"type\":\"user\",\"id\":\"usr_42\"},\"target\":{\"type\":\"user\",\"id\":\"usr_99\"},\"outcome\":\"success\",\"version\":1,\"idempotencyKey\":\"ak_5e7d8f9a0b1c2d3e\",\"prevHash\":\"3f2c8e1a...\",\"hash\":\"9a1b4d7c...\"}}\n","Output — .audit\u002F2026-04-24.ndjson","ndjson",[455,688,689,694],{"__ignoreMap":482},[486,690,691],{"class":488,"line":489},[486,692,693],{},"{\"audit\":{\"action\":\"invoice.refund\",\"actor\":{\"type\":\"user\",\"id\":\"usr_42\"},\"target\":{\"type\":\"invoice\",\"id\":\"inv_889\"},\"outcome\":\"success\",\"version\":1,\"idempotencyKey\":\"ak_8f3c4b2a1e5d6f7c\",\"prevHash\":null,\"hash\":\"3f2c8e1a...\"}}\n",[486,695,696],{"class":488,"line":526},[486,697,698],{},"{\"audit\":{\"action\":\"user.update\",\"actor\":{\"type\":\"user\",\"id\":\"usr_42\"},\"target\":{\"type\":\"user\",\"id\":\"usr_99\"},\"outcome\":\"success\",\"version\":1,\"idempotencyKey\":\"ak_5e7d8f9a0b1c2d3e\",\"prevHash\":\"3f2c8e1a...\",\"hash\":\"9a1b4d7c...\"}}\n",[451,700,701,702,705,706,709],{},"Each line's ",[455,703,704],{},"prevHash"," matches the previous line's ",[455,707,708],{},"hash",". Tampering with any row breaks the chain forward of that point — a verifier replays the hashes and reports the first mismatch.",[468,711,713],{"id":712},"audit-logs-to-a-dedicated-axiom-dataset","Audit logs to a dedicated Axiom dataset",[473,715,716,884,907],{},[476,717,719],{"className":478,"code":718,"filename":480,"language":481,"meta":482,"style":482},"import { auditOnly } from 'evlog'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\n\nnitro.hooks.hook('evlog:drain', createAxiomDrain({ dataset: 'logs' }))\nnitro.hooks.hook('evlog:drain', auditOnly(\n  createAxiomDrain({ dataset: 'audit', apiKey: process.env.AXIOM_AUDIT_API_KEY }),\n))\n",[455,720,721,739,759,763,807,833,880],{"__ignoreMap":482},[486,722,723,725,727,729,731,733,735,737],{"class":488,"line":489},[486,724,493],{"class":492},[486,726,497],{"class":496},[486,728,501],{"class":500},[486,730,510],{"class":496},[486,732,513],{"class":492},[486,734,516],{"class":496},[486,736,520],{"class":519},[486,738,523],{"class":496},[486,740,741,743,745,748,750,752,754,757],{"class":488,"line":526},[486,742,493],{"class":492},[486,744,497],{"class":496},[486,746,747],{"class":500}," createAxiomDrain",[486,749,510],{"class":496},[486,751,513],{"class":492},[486,753,516],{"class":496},[486,755,756],{"class":519},"evlog\u002Faxiom",[486,758,523],{"class":496},[486,760,761],{"class":488,"line":547},[486,762,551],{"emptyLinePlaceholder":550},[486,764,765,767,769,771,773,775,777,779,781,783,785,787,789,791,794,796,798,801,803,805],{"class":488,"line":554},[486,766,557],{"class":500},[486,768,560],{"class":496},[486,770,563],{"class":500},[486,772,560],{"class":496},[486,774,569],{"class":568},[486,776,572],{"class":500},[486,778,575],{"class":496},[486,780,578],{"class":519},[486,782,575],{"class":496},[486,784,504],{"class":496},[486,786,747],{"class":568},[486,788,572],{"class":500},[486,790,603],{"class":496},[486,792,793],{"class":606}," dataset",[486,795,610],{"class":496},[486,797,516],{"class":496},[486,799,800],{"class":519},"logs",[486,802,575],{"class":496},[486,804,510],{"class":496},[486,806,680],{"class":500},[486,808,809,811,813,815,817,819,821,823,825,827,829,831],{"class":488,"line":590},[486,810,557],{"class":500},[486,812,560],{"class":496},[486,814,563],{"class":500},[486,816,560],{"class":496},[486,818,569],{"class":568},[486,820,572],{"class":500},[486,822,575],{"class":496},[486,824,578],{"class":519},[486,826,575],{"class":496},[486,828,504],{"class":496},[486,830,501],{"class":568},[486,832,587],{"class":500},[486,834,835,838,840,842,844,846,848,851,853,855,858,860,863,865,868,870,873,876,878],{"class":488,"line":659},[486,836,837],{"class":568},"  createAxiomDrain",[486,839,572],{"class":500},[486,841,603],{"class":496},[486,843,793],{"class":606},[486,845,610],{"class":496},[486,847,516],{"class":496},[486,849,850],{"class":519},"audit",[486,852,575],{"class":496},[486,854,504],{"class":496},[486,856,857],{"class":606}," apiKey",[486,859,610],{"class":496},[486,861,862],{"class":500}," process",[486,864,560],{"class":496},[486,866,867],{"class":500},"env",[486,869,560],{"class":496},[486,871,872],{"class":500},"AXIOM_AUDIT_API_KEY ",[486,874,875],{"class":496},"}",[486,877,633],{"class":500},[486,879,656],{"class":496},[486,881,882],{"class":488,"line":677},[486,883,680],{"class":500},[476,885,890],{"className":886,"code":887,"filename":888,"language":889,"meta":482,"style":482},"language-kusto shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","['audit']\n| where audit.action == \"invoice.refund\"\n| summarize count() by audit.outcome, bin(_time, 1h)\n","Output — Axiom query","kusto",[455,891,892,897,902],{"__ignoreMap":482},[486,893,894],{"class":488,"line":489},[486,895,896],{},"['audit']\n",[486,898,899],{"class":488,"line":526},[486,900,901],{},"| where audit.action == \"invoice.refund\"\n",[486,903,904],{"class":488,"line":547},[486,905,906],{},"| summarize count() by audit.outcome, bin(_time, 1h)\n",[476,908,911],{"className":886,"code":909,"filename":910,"language":889,"meta":482,"style":482},"['audit']\n| where audit.outcome == \"denied\"\n| summarize count() by audit.actor.id, audit.action\n| order by count_ desc\n","Output — denials by actor",[455,912,913,917,922,927],{"__ignoreMap":482},[486,914,915],{"class":488,"line":489},[486,916,896],{},[486,918,919],{"class":488,"line":526},[486,920,921],{},"| where audit.outcome == \"denied\"\n",[486,923,924],{"class":488,"line":547},[486,925,926],{},"| summarize count() by audit.actor.id, audit.action\n",[486,928,929],{"class":488,"line":554},[486,930,931],{},"| order by count_ desc\n",[451,933,934],{},"Splitting datasets means the audit dataset can have a longer retention (7y), tighter access controls, and a separate billing line — without touching the rest of your pipeline.",[468,936,938],{"id":937},"audit-logs-in-postgres","Audit logs in Postgres",[473,940,941,1197],{},[476,942,944],{"className":478,"code":943,"filename":480,"language":481,"meta":482,"style":482},"import { auditOnly } from 'evlog'\nimport type { DrainContext } from 'evlog'\n\nconst postgresAudit = async (ctx: DrainContext) => {\n  await db.insert(auditEvents).values({\n    id: ctx.event.audit!.idempotencyKey,\n    timestamp: new Date(ctx.event.timestamp),\n    payload: ctx.event,\n  }).onConflictDoNothing()\n}\n\nnitro.hooks.hook('evlog:drain', auditOnly(postgresAudit, { await: true }))\n",[455,945,946,964,986,990,1025,1055,1082,1112,1128,1144,1150,1155],{"__ignoreMap":482},[486,947,948,950,952,954,956,958,960,962],{"class":488,"line":489},[486,949,493],{"class":492},[486,951,497],{"class":496},[486,953,501],{"class":500},[486,955,510],{"class":496},[486,957,513],{"class":492},[486,959,516],{"class":496},[486,961,520],{"class":519},[486,963,523],{"class":496},[486,965,966,968,971,973,976,978,980,982,984],{"class":488,"line":526},[486,967,493],{"class":492},[486,969,970],{"class":492}," type",[486,972,497],{"class":496},[486,974,975],{"class":500}," DrainContext",[486,977,510],{"class":496},[486,979,513],{"class":492},[486,981,516],{"class":496},[486,983,520],{"class":519},[486,985,523],{"class":496},[486,987,988],{"class":488,"line":547},[486,989,551],{"emptyLinePlaceholder":550},[486,991,992,996,999,1002,1005,1008,1012,1014,1017,1019,1022],{"class":488,"line":554},[486,993,995],{"class":994},"spNyl","const",[486,997,998],{"class":500}," postgresAudit ",[486,1000,1001],{"class":496},"=",[486,1003,1004],{"class":994}," async",[486,1006,1007],{"class":496}," (",[486,1009,1011],{"class":1010},"sHdIc","ctx",[486,1013,610],{"class":496},[486,1015,975],{"class":1016},"sBMFI",[486,1018,633],{"class":496},[486,1020,1021],{"class":994}," =>",[486,1023,1024],{"class":496}," {\n",[486,1026,1027,1030,1033,1035,1038,1040,1043,1045,1047,1050,1052],{"class":488,"line":590},[486,1028,1029],{"class":492},"  await",[486,1031,1032],{"class":500}," db",[486,1034,560],{"class":496},[486,1036,1037],{"class":568},"insert",[486,1039,572],{"class":606},[486,1041,1042],{"class":500},"auditEvents",[486,1044,633],{"class":606},[486,1046,560],{"class":496},[486,1048,1049],{"class":568},"values",[486,1051,572],{"class":606},[486,1053,1054],{"class":496},"{\n",[486,1056,1057,1060,1062,1065,1067,1070,1072,1074,1077,1080],{"class":488,"line":659},[486,1058,1059],{"class":606},"    id",[486,1061,610],{"class":496},[486,1063,1064],{"class":500}," ctx",[486,1066,560],{"class":496},[486,1068,1069],{"class":500},"event",[486,1071,560],{"class":496},[486,1073,850],{"class":500},[486,1075,1076],{"class":496},"!.",[486,1078,1079],{"class":500},"idempotencyKey",[486,1081,656],{"class":496},[486,1083,1084,1087,1089,1092,1095,1097,1099,1101,1103,1105,1108,1110],{"class":488,"line":677},[486,1085,1086],{"class":606},"    timestamp",[486,1088,610],{"class":496},[486,1090,1091],{"class":496}," new",[486,1093,1094],{"class":568}," Date",[486,1096,572],{"class":606},[486,1098,1011],{"class":500},[486,1100,560],{"class":496},[486,1102,1069],{"class":500},[486,1104,560],{"class":496},[486,1106,1107],{"class":500},"timestamp",[486,1109,633],{"class":606},[486,1111,656],{"class":496},[486,1113,1115,1118,1120,1122,1124,1126],{"class":488,"line":1114},8,[486,1116,1117],{"class":606},"    payload",[486,1119,610],{"class":496},[486,1121,1064],{"class":500},[486,1123,560],{"class":496},[486,1125,1069],{"class":500},[486,1127,656],{"class":496},[486,1129,1131,1134,1136,1138,1141],{"class":488,"line":1130},9,[486,1132,1133],{"class":496},"  }",[486,1135,633],{"class":606},[486,1137,560],{"class":496},[486,1139,1140],{"class":568},"onConflictDoNothing",[486,1142,1143],{"class":606},"()\n",[486,1145,1147],{"class":488,"line":1146},10,[486,1148,1149],{"class":496},"}\n",[486,1151,1153],{"class":488,"line":1152},11,[486,1154,551],{"emptyLinePlaceholder":550},[486,1156,1158,1160,1162,1164,1166,1168,1170,1172,1174,1176,1178,1180,1183,1185,1187,1189,1191,1193,1195],{"class":488,"line":1157},12,[486,1159,557],{"class":500},[486,1161,560],{"class":496},[486,1163,563],{"class":500},[486,1165,560],{"class":496},[486,1167,569],{"class":568},[486,1169,572],{"class":500},[486,1171,575],{"class":496},[486,1173,578],{"class":519},[486,1175,575],{"class":496},[486,1177,504],{"class":496},[486,1179,501],{"class":568},[486,1181,1182],{"class":500},"(postgresAudit",[486,1184,504],{"class":496},[486,1186,497],{"class":496},[486,1188,665],{"class":606},[486,1190,610],{"class":496},[486,1192,671],{"class":670},[486,1194,510],{"class":496},[486,1196,680],{"class":500},[476,1198,1203],{"className":1199,"code":1200,"filename":1201,"language":1202,"meta":482,"style":482},"language-sql shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","SELECT id, timestamp, payload->'audit'->>'action' AS action,\n       payload->'audit'->>'outcome' AS outcome\nFROM audit_events\nWHERE id = 'ak_8f3c4b2a1e5d6f7c';\n\n--          id          |       timestamp       |     action      | outcome\n-- ---------------------+-----------------------+-----------------+---------\n--  ak_8f3c4b2a1e5d6f7c | 2026-04-24 10:23:45.6 | invoice.refund  | success\n","Output — audit_events row","sql",[455,1204,1205,1210,1215,1220,1225,1229,1234,1239],{"__ignoreMap":482},[486,1206,1207],{"class":488,"line":489},[486,1208,1209],{},"SELECT id, timestamp, payload->'audit'->>'action' AS action,\n",[486,1211,1212],{"class":488,"line":526},[486,1213,1214],{},"       payload->'audit'->>'outcome' AS outcome\n",[486,1216,1217],{"class":488,"line":547},[486,1218,1219],{},"FROM audit_events\n",[486,1221,1222],{"class":488,"line":554},[486,1223,1224],{},"WHERE id = 'ak_8f3c4b2a1e5d6f7c';\n",[486,1226,1227],{"class":488,"line":590},[486,1228,551],{"emptyLinePlaceholder":550},[486,1230,1231],{"class":488,"line":659},[486,1232,1233],{},"--          id          |       timestamp       |     action      | outcome\n",[486,1235,1236],{"class":488,"line":677},[486,1237,1238],{},"-- ---------------------+-----------------------+-----------------+---------\n",[486,1240,1241],{"class":488,"line":1114},[486,1242,1243],{},"--  ak_8f3c4b2a1e5d6f7c | 2026-04-24 10:23:45.6 | invoice.refund  | success\n",[451,1245,1246,1247,1249,1250,1253],{},"The deterministic ",[455,1248,1079],{}," makes retries safe — duplicate inserts collapse via ",[455,1251,1252],{},"ON CONFLICT DO NOTHING",". Without it, a transient network blip during a retry would create a duplicate audit row, which is exactly what you don't want.",[468,1255,1257],{"id":1256},"testing-audits","Testing audits",[451,1259,1260,1263,1264,458,1267,1270,1271,610],{},[455,1261,1262],{},"mockAudit()"," captures every audit event on emit — from standalone ",[455,1265,1266],{},"audit()",[455,1268,1269],{},"log.audit()",", and ",[455,1272,1273],{},"log.set({ audit })",[476,1275,1277],{"className":478,"code":1276,"language":481,"meta":482,"style":482},"import { mockAudit } from 'evlog'\n\nit('refunds the invoice and records an audit', async () => {\n  const captured = mockAudit()\n\n  await refundInvoice({ id: 'inv_889' }, { actor: { type: 'user', id: 'u1' } })\n\n  captured.assertAudit({\n    action: 'invoice.refund',\n    target: { type: 'invoice', id: 'inv_889' },\n    outcome: 'success',\n  })\n\n  captured.restore()\n})\n",[455,1278,1279,1298,1302,1327,1342,1346,1412,1416,1430,1446,1480,1496,1502,1507,1519],{"__ignoreMap":482},[486,1280,1281,1283,1285,1288,1290,1292,1294,1296],{"class":488,"line":489},[486,1282,493],{"class":492},[486,1284,497],{"class":496},[486,1286,1287],{"class":500}," mockAudit",[486,1289,510],{"class":496},[486,1291,513],{"class":492},[486,1293,516],{"class":496},[486,1295,520],{"class":519},[486,1297,523],{"class":496},[486,1299,1300],{"class":488,"line":526},[486,1301,551],{"emptyLinePlaceholder":550},[486,1303,1304,1307,1309,1311,1314,1316,1318,1320,1323,1325],{"class":488,"line":547},[486,1305,1306],{"class":568},"it",[486,1308,572],{"class":500},[486,1310,575],{"class":496},[486,1312,1313],{"class":519},"refunds the invoice and records an audit",[486,1315,575],{"class":496},[486,1317,504],{"class":496},[486,1319,1004],{"class":994},[486,1321,1322],{"class":496}," ()",[486,1324,1021],{"class":994},[486,1326,1024],{"class":496},[486,1328,1329,1332,1335,1338,1340],{"class":488,"line":554},[486,1330,1331],{"class":994},"  const",[486,1333,1334],{"class":500}," captured",[486,1336,1337],{"class":496}," =",[486,1339,1287],{"class":568},[486,1341,1143],{"class":606},[486,1343,1344],{"class":488,"line":590},[486,1345,551],{"emptyLinePlaceholder":550},[486,1347,1348,1350,1353,1355,1357,1360,1362,1364,1367,1369,1372,1374,1377,1379,1381,1383,1385,1387,1390,1392,1394,1396,1398,1400,1403,1405,1407,1409],{"class":488,"line":659},[486,1349,1029],{"class":492},[486,1351,1352],{"class":568}," refundInvoice",[486,1354,572],{"class":606},[486,1356,603],{"class":496},[486,1358,1359],{"class":606}," id",[486,1361,610],{"class":496},[486,1363,516],{"class":496},[486,1365,1366],{"class":519},"inv_889",[486,1368,575],{"class":496},[486,1370,1371],{"class":496}," },",[486,1373,497],{"class":496},[486,1375,1376],{"class":606}," actor",[486,1378,610],{"class":496},[486,1380,497],{"class":496},[486,1382,970],{"class":606},[486,1384,610],{"class":496},[486,1386,516],{"class":496},[486,1388,1389],{"class":519},"user",[486,1391,575],{"class":496},[486,1393,504],{"class":496},[486,1395,1359],{"class":606},[486,1397,610],{"class":496},[486,1399,516],{"class":496},[486,1401,1402],{"class":519},"u1",[486,1404,575],{"class":496},[486,1406,510],{"class":496},[486,1408,510],{"class":496},[486,1410,1411],{"class":606},")\n",[486,1413,1414],{"class":488,"line":677},[486,1415,551],{"emptyLinePlaceholder":550},[486,1417,1418,1421,1423,1426,1428],{"class":488,"line":1114},[486,1419,1420],{"class":500},"  captured",[486,1422,560],{"class":496},[486,1424,1425],{"class":568},"assertAudit",[486,1427,572],{"class":606},[486,1429,1054],{"class":496},[486,1431,1432,1435,1437,1439,1442,1444],{"class":488,"line":1130},[486,1433,1434],{"class":606},"    action",[486,1436,610],{"class":496},[486,1438,516],{"class":496},[486,1440,1441],{"class":519},"invoice.refund",[486,1443,575],{"class":496},[486,1445,656],{"class":496},[486,1447,1448,1451,1453,1455,1457,1459,1461,1464,1466,1468,1470,1472,1474,1476,1478],{"class":488,"line":1146},[486,1449,1450],{"class":606},"    target",[486,1452,610],{"class":496},[486,1454,497],{"class":496},[486,1456,970],{"class":606},[486,1458,610],{"class":496},[486,1460,516],{"class":496},[486,1462,1463],{"class":519},"invoice",[486,1465,575],{"class":496},[486,1467,504],{"class":496},[486,1469,1359],{"class":606},[486,1471,610],{"class":496},[486,1473,516],{"class":496},[486,1475,1366],{"class":519},[486,1477,575],{"class":496},[486,1479,674],{"class":496},[486,1481,1482,1485,1487,1489,1492,1494],{"class":488,"line":1152},[486,1483,1484],{"class":606},"    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