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await",[506,687,630],{"class":516},[506,689,691],{"class":690},"sfNiH"," true",[506,693,694],{"class":516}," },\n",[506,696,698],{"class":508,"line":697},7,[506,699,700],{"class":520},"))\n",[496,702,707],{"className":703,"code":704,"filename":705,"language":706,"meta":502,"style":502},"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",[475,708,709,714],{"__ignoreMap":502},[506,710,711],{"class":508,"line":509},[506,712,713],{},"{\"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",[506,715,716],{"class":508,"line":546},[506,717,718],{},"{\"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",[471,720,721,722,725,726,729],{},"Each line's ",[475,723,724],{},"prevHash"," matches the previous line's ",[475,727,728],{},"hash",". Tampering with any row breaks the chain forward of that point — a verifier replays the hashes and reports the first mismatch.",[488,731,733],{"id":732},"audit-logs-to-a-dedicated-axiom-dataset","Audit logs to a dedicated Axiom dataset",[493,735,736,904,927],{},[496,737,739],{"className":498,"code":738,"filename":500,"language":501,"meta":502,"style":502},"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",[475,740,741,759,779,783,827,853,900],{"__ignoreMap":502},[506,742,743,745,747,749,751,753,755,757],{"class":508,"line":509},[506,744,513],{"class":512},[506,746,517],{"class":516},[506,748,521],{"class":520},[506,750,530],{"class":516},[506,752,533],{"class":512},[506,754,536],{"class":516},[506,756,540],{"class":539},[506,758,543],{"class":516},[506,760,761,763,765,768,770,772,774,777],{"class":508,"line":546},[506,762,513],{"class":512},[506,764,517],{"class":516},[506,766,767],{"class":520}," createAxiomDrain",[506,769,530],{"class":516},[506,771,533],{"class":512},[506,773,536],{"class":516},[506,775,776],{"class":539},"evlog\u002Faxiom",[506,778,543],{"class":516},[506,780,781],{"class":508,"line":567},[506,782,571],{"emptyLinePlaceholder":570},[506,784,785,787,789,791,793,795,797,799,801,803,805,807,809,811,814,816,818,821,823,825],{"class":508,"line":574},[506,786,577],{"class":520},[506,788,580],{"class":516},[506,790,583],{"class":520},[506,792,580],{"class":516},[506,794,589],{"class":588},[506,796,592],{"class":520},[506,798,595],{"class":516},[506,800,598],{"class":539},[506,802,595],{"class":516},[506,804,524],{"class":516},[506,806,767],{"class":588},[506,808,592],{"class":520},[506,810,623],{"class":516},[506,812,813],{"class":626}," dataset",[506,815,630],{"class":516},[506,817,536],{"class":516},[506,819,820],{"class":539},"logs",[506,822,595],{"class":516},[506,824,530],{"class":516},[506,826,700],{"class":520},[506,828,829,831,833,835,837,839,841,843,845,847,849,851],{"class":508,"line":610},[506,830,577],{"class":520},[506,832,580],{"class":516},[506,834,583],{"class":520},[506,836,580],{"class":516},[506,838,589],{"class":588},[506,840,592],{"class":520},[506,842,595],{"class":516},[506,844,598],{"class":539},[506,846,595],{"class":516},[506,848,524],{"class":516},[506,850,521],{"class":588},[506,852,607],{"class":520},[506,854,855,858,860,862,864,866,868,871,873,875,878,880,883,885,888,890,893,896,898],{"class":508,"line":679},[506,856,857],{"class":588},"  createAxiomDrain",[506,859,592],{"class":520},[506,861,623],{"class":516},[506,863,813],{"class":626},[506,865,630],{"class":516},[506,867,536],{"class":516},[506,869,870],{"class":539},"audit",[506,872,595],{"class":516},[506,874,524],{"class":516},[506,876,877],{"class":626}," apiKey",[506,879,630],{"class":516},[506,881,882],{"class":520}," process",[506,884,580],{"class":516},[506,886,887],{"class":520},"env",[506,889,580],{"class":516},[506,891,892],{"class":520},"AXIOM_AUDIT_API_KEY ",[506,894,895],{"class":516},"}",[506,897,653],{"class":520},[506,899,676],{"class":516},[506,901,902],{"class":508,"line":697},[506,903,700],{"class":520},[496,905,910],{"className":906,"code":907,"filename":908,"language":909,"meta":502,"style":502},"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",[475,911,912,917,922],{"__ignoreMap":502},[506,913,914],{"class":508,"line":509},[506,915,916],{},"['audit']\n",[506,918,919],{"class":508,"line":546},[506,920,921],{},"| where audit.action == \"invoice.refund\"\n",[506,923,924],{"class":508,"line":567},[506,925,926],{},"| summarize count() by audit.outcome, bin(_time, 1h)\n",[496,928,931],{"className":906,"code":929,"filename":930,"language":909,"meta":502,"style":502},"['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",[475,932,933,937,942,947],{"__ignoreMap":502},[506,934,935],{"class":508,"line":509},[506,936,916],{},[506,938,939],{"class":508,"line":546},[506,940,941],{},"| where audit.outcome == \"denied\"\n",[506,943,944],{"class":508,"line":567},[506,945,946],{},"| summarize count() by audit.actor.id, audit.action\n",[506,948,949],{"class":508,"line":574},[506,950,951],{},"| order by count_ desc\n",[471,953,954],{},"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.",[488,956,958],{"id":957},"audit-logs-in-postgres","Audit logs in Postgres",[493,960,961,1217],{},[496,962,964],{"className":498,"code":963,"filename":500,"language":501,"meta":502,"style":502},"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",[475,965,966,984,1006,1010,1045,1075,1102,1132,1148,1164,1170,1175],{"__ignoreMap":502},[506,967,968,970,972,974,976,978,980,982],{"class":508,"line":509},[506,969,513],{"class":512},[506,971,517],{"class":516},[506,973,521],{"class":520},[506,975,530],{"class":516},[506,977,533],{"class":512},[506,979,536],{"class":516},[506,981,540],{"class":539},[506,983,543],{"class":516},[506,985,986,988,991,993,996,998,1000,1002,1004],{"class":508,"line":546},[506,987,513],{"class":512},[506,989,990],{"class":512}," type",[506,992,517],{"class":516},[506,994,995],{"class":520}," DrainContext",[506,997,530],{"class":516},[506,999,533],{"class":512},[506,1001,536],{"class":516},[506,1003,540],{"class":539},[506,1005,543],{"class":516},[506,1007,1008],{"class":508,"line":567},[506,1009,571],{"emptyLinePlaceholder":570},[506,1011,1012,1016,1019,1022,1025,1028,1032,1034,1037,1039,1042],{"class":508,"line":574},[506,1013,1015],{"class":1014},"spNyl","const",[506,1017,1018],{"class":520}," postgresAudit ",[506,1020,1021],{"class":516},"=",[506,1023,1024],{"class":1014}," async",[506,1026,1027],{"class":516}," (",[506,1029,1031],{"class":1030},"sHdIc","ctx",[506,1033,630],{"class":516},[506,1035,995],{"class":1036},"sBMFI",[506,1038,653],{"class":516},[506,1040,1041],{"class":1014}," =>",[506,1043,1044],{"class":516}," {\n",[506,1046,1047,1050,1053,1055,1058,1060,1063,1065,1067,1070,1072],{"class":508,"line":610},[506,1048,1049],{"class":512},"  await",[506,1051,1052],{"class":520}," db",[506,1054,580],{"class":516},[506,1056,1057],{"class":588},"insert",[506,1059,592],{"class":626},[506,1061,1062],{"class":520},"auditEvents",[506,1064,653],{"class":626},[506,1066,580],{"class":516},[506,1068,1069],{"class":588},"values",[506,1071,592],{"class":626},[506,1073,1074],{"class":516},"{\n",[506,1076,1077,1080,1082,1085,1087,1090,1092,1094,1097,1100],{"class":508,"line":679},[506,1078,1079],{"class":626},"    id",[506,1081,630],{"class":516},[506,1083,1084],{"class":520}," ctx",[506,1086,580],{"class":516},[506,1088,1089],{"class":520},"event",[506,1091,580],{"class":516},[506,1093,870],{"class":520},[506,1095,1096],{"class":516},"!.",[506,1098,1099],{"class":520},"idempotencyKey",[506,1101,676],{"class":516},[506,1103,1104,1107,1109,1112,1115,1117,1119,1121,1123,1125,1128,1130],{"class":508,"line":697},[506,1105,1106],{"class":626},"    timestamp",[506,1108,630],{"class":516},[506,1110,1111],{"class":516}," new",[506,1113,1114],{"class":588}," Date",[506,1116,592],{"class":626},[506,1118,1031],{"class":520},[506,1120,580],{"class":516},[506,1122,1089],{"class":520},[506,1124,580],{"class":516},[506,1126,1127],{"class":520},"timestamp",[506,1129,653],{"class":626},[506,1131,676],{"class":516},[506,1133,1135,1138,1140,1142,1144,1146],{"class":508,"line":1134},8,[506,1136,1137],{"class":626},"    payload",[506,1139,630],{"class":516},[506,1141,1084],{"class":520},[506,1143,580],{"class":516},[506,1145,1089],{"class":520},[506,1147,676],{"class":516},[506,1149,1151,1154,1156,1158,1161],{"class":508,"line":1150},9,[506,1152,1153],{"class":516},"  }",[506,1155,653],{"class":626},[506,1157,580],{"class":516},[506,1159,1160],{"class":588},"onConflictDoNothing",[506,1162,1163],{"class":626},"()\n",[506,1165,1167],{"class":508,"line":1166},10,[506,1168,1169],{"class":516},"}\n",[506,1171,1173],{"class":508,"line":1172},11,[506,1174,571],{"emptyLinePlaceholder":570},[506,1176,1178,1180,1182,1184,1186,1188,1190,1192,1194,1196,1198,1200,1203,1205,1207,1209,1211,1213,1215],{"class":508,"line":1177},12,[506,1179,577],{"class":520},[506,1181,580],{"class":516},[506,1183,583],{"class":520},[506,1185,580],{"class":516},[506,1187,589],{"class":588},[506,1189,592],{"class":520},[506,1191,595],{"class":516},[506,1193,598],{"class":539},[506,1195,595],{"class":516},[506,1197,524],{"class":516},[506,1199,521],{"class":588},[506,1201,1202],{"class":520},"(postgresAudit",[506,1204,524],{"class":516},[506,1206,517],{"class":516},[506,1208,685],{"class":626},[506,1210,630],{"class":516},[506,1212,691],{"class":690},[506,1214,530],{"class":516},[506,1216,700],{"class":520},[496,1218,1223],{"className":1219,"code":1220,"filename":1221,"language":1222,"meta":502,"style":502},"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",[475,1224,1225,1230,1235,1240,1245,1249,1254,1259],{"__ignoreMap":502},[506,1226,1227],{"class":508,"line":509},[506,1228,1229],{},"SELECT id, timestamp, payload->'audit'->>'action' AS action,\n",[506,1231,1232],{"class":508,"line":546},[506,1233,1234],{},"       payload->'audit'->>'outcome' AS outcome\n",[506,1236,1237],{"class":508,"line":567},[506,1238,1239],{},"FROM audit_events\n",[506,1241,1242],{"class":508,"line":574},[506,1243,1244],{},"WHERE id = 'ak_8f3c4b2a1e5d6f7c';\n",[506,1246,1247],{"class":508,"line":610},[506,1248,571],{"emptyLinePlaceholder":570},[506,1250,1251],{"class":508,"line":679},[506,1252,1253],{},"--          id          |       timestamp       |     action      | outcome\n",[506,1255,1256],{"class":508,"line":697},[506,1257,1258],{},"-- ---------------------+-----------------------+-----------------+---------\n",[506,1260,1261],{"class":508,"line":1134},[506,1262,1263],{},"--  ak_8f3c4b2a1e5d6f7c | 2026-04-24 10:23:45.6 | invoice.refund  | success\n",[471,1265,1266,1267,1269,1270,1273],{},"The deterministic ",[475,1268,1099],{}," makes retries safe — duplicate inserts collapse via ",[475,1271,1272],{},"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.",[488,1275,1277],{"id":1276},"testing-audits","Testing audits",[471,1279,1280,1283,1284,478,1287,1290,1291,630],{},[475,1281,1282],{},"mockAudit()"," captures every audit event on emit — from standalone ",[475,1285,1286],{},"audit()",[475,1288,1289],{},"log.audit()",", and ",[475,1292,1293],{},"log.set({ audit })",[496,1295,1297],{"className":498,"code":1296,"language":501,"meta":502,"style":502},"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",[475,1298,1299,1318,1322,1347,1362,1366,1432,1436,1450,1466,1500,1516,1522,1527,1539],{"__ignoreMap":502},[506,1300,1301,1303,1305,1308,1310,1312,1314,1316],{"class":508,"line":509},[506,1302,513],{"class":512},[506,1304,517],{"class":516},[506,1306,1307],{"class":520}," mockAudit",[506,1309,530],{"class":516},[506,1311,533],{"class":512},[506,1313,536],{"class":516},[506,1315,540],{"class":539},[506,1317,543],{"class":516},[506,1319,1320],{"class":508,"line":546},[506,1321,571],{"emptyLinePlaceholder":570},[506,1323,1324,1327,1329,1331,1334,1336,1338,1340,1343,1345],{"class":508,"line":567},[506,1325,1326],{"class":588},"it",[506,1328,592],{"class":520},[506,1330,595],{"class":516},[506,1332,1333],{"class":539},"refunds the invoice and records an audit",[506,1335,595],{"class":516},[506,1337,524],{"class":516},[506,1339,1024],{"class":1014},[506,1341,1342],{"class":516}," ()",[506,1344,1041],{"class":1014},[506,1346,1044],{"class":516},[506,1348,1349,1352,1355,1358,1360],{"class":508,"line":574},[506,1350,1351],{"class":1014},"  const",[506,1353,1354],{"class":520}," captured",[506,1356,1357],{"class":516}," =",[506,1359,1307],{"class":588},[506,1361,1163],{"class":626},[506,1363,1364],{"class":508,"line":610},[506,1365,571],{"emptyLinePlaceholder":570},[506,1367,1368,1370,1373,1375,1377,1380,1382,1384,1387,1389,1392,1394,1397,1399,1401,1403,1405,1407,1410,1412,1414,1416,1418,1420,1423,1425,1427,1429],{"class":508,"line":679},[506,1369,1049],{"class":512},[506,1371,1372],{"class":588}," refundInvoice",[506,1374,592],{"class":626},[506,1376,623],{"class":516},[506,1378,1379],{"class":626}," id",[506,1381,630],{"class":516},[506,1383,536],{"class":516},[506,1385,1386],{"class":539},"inv_889",[506,1388,595],{"class":516},[506,1390,1391],{"class":516}," },",[506,1393,517],{"class":516},[506,1395,1396],{"class":626}," actor",[506,1398,630],{"class":516},[506,1400,517],{"class":516},[506,1402,990],{"class":626},[506,1404,630],{"class":516},[506,1406,536],{"class":516},[506,1408,1409],{"class":539},"user",[506,1411,595],{"class":516},[506,1413,524],{"class":516},[506,1415,1379],{"class":626},[506,1417,630],{"class":516},[506,1419,536],{"class":516},[506,1421,1422],{"class":539},"u1",[506,1424,595],{"class":516},[506,1426,530],{"class":516},[506,1428,530],{"class":516},[506,1430,1431],{"class":626},")\n",[506,1433,1434],{"class":508,"line":697},[506,1435,571],{"emptyLinePlaceholder":570},[506,1437,1438,1441,1443,1446,1448],{"class":508,"line":1134},[506,1439,1440],{"class":520},"  captured",[506,1442,580],{"class":516},[506,1444,1445],{"class":588},"assertAudit",[506,1447,592],{"class":626},[506,1449,1074],{"class":516},[506,1451,1452,1455,1457,1459,1462,1464],{"class":508,"line":1150},[506,1453,1454],{"class":626},"    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