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It works with a local instance, a self-managed cluster, and ClickHouse Cloud.",[583,600,601,602,606,607,610],{},"The default schema gives you ",[603,604,605],"strong",{},"typed columns"," for the fields you filter and aggregate on, plus the complete wide event as JSON in ",[595,608,609],{},"data",", so no field is ever lost, and adding a field to your events never requires a migration.",[612,613,616,619,649],"prompt",{":actions":614,"description":615,"icon":199},"[\"copy\",\"cursor\",\"claude\"]","Add the ClickHouse drain adapter",[583,617,618],{},"Add the ClickHouse drain adapter to store evlog wide events in ClickHouse.",[620,621,622,626,629,632,635,638,646],"ol",{},[623,624,625],"li",{},"Identify which framework I'm using and follow its evlog integration pattern",[623,627,628],{},"Install evlog if not already installed",[623,630,631],{},"Create the evlog_events table using the CREATE TABLE from the adapter docs",[623,633,634],{},"Import createClickHouseDrain from 'evlog\u002Fclickhouse'",[623,636,637],{},"Wire createClickHouseDrain() into my framework's drain configuration",[623,639,640,641,645],{},"Set CLICKHOUSE_ENDPOINT (e.g. ",[587,642,643],{"href":643,"rel":644},"http:\u002F\u002Flocalhost:8123",[591],"), plus CLICKHOUSE_USER \u002F CLICKHOUSE_PASSWORD if authenticated",[623,647,648],{},"Test by triggering a request and running SELECT * FROM evlog_events ORDER BY timestamp DESC LIMIT 10",[583,650,651,652,656,657],{},"Adapter docs: ",[587,653,654],{"href":654,"rel":655},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Fhybrid\u002Fclickhouse",[591],"\nFramework setup: ",[587,658,659],{"href":659,"rel":660},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fframeworks\u002Foverview",[591],[662,663,20],"h2",{"id":664},"installation",[583,666,667],{},"The ClickHouse adapter comes bundled with evlog:",[669,670,676],"pre",{"className":671,"code":672,"filename":673,"language":674,"meta":675,"style":675},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { createClickHouseDrain } from 'evlog\u002Fclickhouse'\n","src\u002Findex.ts","typescript","",[595,677,678],{"__ignoreMap":675},[679,680,683,687,691,695,698,701,704,708],"span",{"class":681,"line":682},"line",1,[679,684,686],{"class":685},"s7zQu","import",[679,688,690],{"class":689},"sMK4o"," {",[679,692,694],{"class":693},"sTEyZ"," createClickHouseDrain",[679,696,697],{"class":689}," }",[679,699,700],{"class":685}," from",[679,702,703],{"class":689}," '",[679,705,707],{"class":706},"sfazB","evlog\u002Fclickhouse",[679,709,710],{"class":689},"'\n",[662,712,714],{"id":713},"create-the-table","Create the table",[583,716,717],{},"Run this once before wiring the drain:",[669,719,724],{"className":720,"code":721,"filename":722,"language":723,"meta":675,"style":675},"language-sql shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","CREATE TABLE IF NOT EXISTS evlog_events\n(\n  timestamp     DateTime64(3, 'UTC'),\n  level         LowCardinality(String),\n  service       LowCardinality(String),\n  environment   LowCardinality(String),\n  request_id    String,\n  trace_id      String,\n  span_id       String,\n  method        LowCardinality(String),\n  path          String,\n  status        Nullable(UInt16),\n  duration      String,\n  duration_ms   Nullable(UInt32),\n  error_name    String,\n  error_message String,\n  data          String\n)\nENGINE = MergeTree\nPARTITION BY toYYYYMM(timestamp)\nORDER BY (service, environment, timestamp)\nTTL toDateTime(timestamp) + INTERVAL 30 DAY;\n","schema.sql","sql",[595,725,726,748,754,781,790,799,805,811,817,823,829,838,847,853,859,865,871,880,886,898,915,934],{"__ignoreMap":675},[679,727,728,732,735,739,742,745],{"class":681,"line":682},[679,729,731],{"class":730},"sbssI","CREATE",[679,733,734],{"class":730}," TABLE",[679,736,738],{"class":737},"s2Zo4"," IF",[679,740,741],{"class":730}," NOT",[679,743,744],{"class":730}," EXISTS",[679,746,747],{"class":693}," evlog_events\n",[679,749,751],{"class":681,"line":750},2,[679,752,753],{"class":693},"(\n",[679,755,757,761,764,767,770,773,776,778],{"class":681,"line":756},3,[679,758,760],{"class":759},"spNyl","  timestamp",[679,762,763],{"class":693},"     DateTime64(",[679,765,766],{"class":730},"3",[679,768,769],{"class":693},", ",[679,771,772],{"class":689},"'",[679,774,775],{"class":706},"UTC",[679,777,772],{"class":689},[679,779,780],{"class":693},"),\n",[679,782,784,787],{"class":681,"line":783},4,[679,785,786],{"class":730},"  level",[679,788,789],{"class":693},"         LowCardinality(String),\n",[679,791,793,796],{"class":681,"line":792},5,[679,794,795],{"class":730},"  service",[679,797,798],{"class":693},"       LowCardinality(String),\n",[679,800,802],{"class":681,"line":801},6,[679,803,804],{"class":693},"  environment   LowCardinality(String),\n",[679,806,808],{"class":681,"line":807},7,[679,809,810],{"class":693},"  request_id    String,\n",[679,812,814],{"class":681,"line":813},8,[679,815,816],{"class":693},"  trace_id      String,\n",[679,818,820],{"class":681,"line":819},9,[679,821,822],{"class":693},"  span_id       String,\n",[679,824,826],{"class":681,"line":825},10,[679,827,828],{"class":693},"  method        LowCardinality(String),\n",[679,830,832,835],{"class":681,"line":831},11,[679,833,834],{"class":759},"  path",[679,836,837],{"class":693},"          String,\n",[679,839,841,844],{"class":681,"line":840},12,[679,842,843],{"class":730},"  status",[679,845,846],{"class":693},"        Nullable(UInt16),\n",[679,848,850],{"class":681,"line":849},13,[679,851,852],{"class":693},"  duration      String,\n",[679,854,856],{"class":681,"line":855},14,[679,857,858],{"class":693},"  duration_ms   Nullable(UInt32),\n",[679,860,862],{"class":681,"line":861},15,[679,863,864],{"class":693},"  error_name    String,\n",[679,866,868],{"class":681,"line":867},16,[679,869,870],{"class":693},"  error_message String,\n",[679,872,874,877],{"class":681,"line":873},17,[679,875,876],{"class":730},"  data",[679,878,879],{"class":693},"          String\n",[679,881,883],{"class":681,"line":882},18,[679,884,885],{"class":693},")\n",[679,887,889,892,895],{"class":681,"line":888},19,[679,890,891],{"class":693},"ENGINE ",[679,893,894],{"class":689},"=",[679,896,897],{"class":693}," MergeTree\n",[679,899,901,904,907,910,913],{"class":681,"line":900},20,[679,902,903],{"class":730},"PARTITION",[679,905,906],{"class":730}," BY",[679,908,909],{"class":693}," toYYYYMM(",[679,911,912],{"class":759},"timestamp",[679,914,885],{"class":693},[679,916,918,921,924,927,930,932],{"class":681,"line":917},21,[679,919,920],{"class":730},"ORDER BY",[679,922,923],{"class":693}," (",[679,925,926],{"class":730},"service",[679,928,929],{"class":693},", environment, ",[679,931,912],{"class":759},[679,933,885],{"class":693},[679,935,937,940,942,945,948,951,954,957],{"class":681,"line":936},22,[679,938,939],{"class":693},"TTL toDateTime(",[679,941,912],{"class":759},[679,943,944],{"class":693},") ",[679,946,947],{"class":689},"+",[679,949,950],{"class":693}," INTERVAL ",[679,952,953],{"class":730},"30",[679,955,956],{"class":730}," DAY",[679,958,959],{"class":693},";\n",[961,962,964,967,968,971],"callout",{"color":963,"icon":13},"info",[595,965,966],{},"ORDER BY (service, environment, timestamp)"," matches how you'll filter most often. Adjust the ",[595,969,970],{},"TTL"," to your retention policy, and drop the clause entirely to keep events forever.",[662,973,25],{"id":974},"quick-start",[976,977,978,1084,1205,1309,1416,1521,1656],"code-group",{},[669,979,982],{"className":671,"code":980,"filename":981,"language":674,"meta":675,"style":675},"\u002F\u002F server\u002Fplugins\u002Fevlog.ts\nimport { createClickHouseDrain } from 'evlog\u002Fclickhouse'\n\nexport default defineNitroPlugin((nitroApp) => {\n  nitroApp.hooks.hook('evlog:drain', createClickHouseDrain())\n})\n","Nuxt \u002F Nitro",[595,983,984,990,1008,1014,1043,1077],{"__ignoreMap":675},[679,985,986],{"class":681,"line":682},[679,987,989],{"class":988},"sHwdD","\u002F\u002F server\u002Fplugins\u002Fevlog.ts\n",[679,991,992,994,996,998,1000,1002,1004,1006],{"class":681,"line":750},[679,993,686],{"class":685},[679,995,690],{"class":689},[679,997,694],{"class":693},[679,999,697],{"class":689},[679,1001,700],{"class":685},[679,1003,703],{"class":689},[679,1005,707],{"class":706},[679,1007,710],{"class":689},[679,1009,1010],{"class":681,"line":756},[679,1011,1013],{"emptyLinePlaceholder":1012},true,"\n",[679,1015,1016,1019,1022,1025,1028,1030,1034,1037,1040],{"class":681,"line":783},[679,1017,1018],{"class":685},"export",[679,1020,1021],{"class":685}," default",[679,1023,1024],{"class":737}," defineNitroPlugin",[679,1026,1027],{"class":693},"(",[679,1029,1027],{"class":689},[679,1031,1033],{"class":1032},"sHdIc","nitroApp",[679,1035,1036],{"class":689},")",[679,1038,1039],{"class":759}," =>",[679,1041,1042],{"class":689}," {\n",[679,1044,1045,1048,1051,1054,1056,1059,1062,1064,1067,1069,1072,1074],{"class":681,"line":792},[679,1046,1047],{"class":693},"  nitroApp",[679,1049,1050],{"class":689},".",[679,1052,1053],{"class":693},"hooks",[679,1055,1050],{"class":689},[679,1057,1058],{"class":737},"hook",[679,1060,1027],{"class":1061},"swJcz",[679,1063,772],{"class":689},[679,1065,1066],{"class":706},"evlog:drain",[679,1068,772],{"class":689},[679,1070,1071],{"class":689},",",[679,1073,694],{"class":737},[679,1075,1076],{"class":1061},"())\n",[679,1078,1079,1082],{"class":681,"line":801},[679,1080,1081],{"class":689},"}",[679,1083,885],{"class":693},[669,1085,1087],{"className":671,"code":1086,"filename":275,"language":674,"meta":675,"style":675},"import { Hono } from 'hono'\nimport { evlog } from 'evlog\u002Fhono'\nimport { createClickHouseDrain } from 'evlog\u002Fclickhouse'\n\nconst app = new Hono()\napp.use(evlog({ drain: createClickHouseDrain() }))\n",[595,1088,1089,1109,1129,1147,1151,1169],{"__ignoreMap":675},[679,1090,1091,1093,1095,1098,1100,1102,1104,1107],{"class":681,"line":682},[679,1092,686],{"class":685},[679,1094,690],{"class":689},[679,1096,1097],{"class":693}," Hono",[679,1099,697],{"class":689},[679,1101,700],{"class":685},[679,1103,703],{"class":689},[679,1105,1106],{"class":706},"hono",[679,1108,710],{"class":689},[679,1110,1111,1113,1115,1118,1120,1122,1124,1127],{"class":681,"line":750},[679,1112,686],{"class":685},[679,1114,690],{"class":689},[679,1116,1117],{"class":693}," evlog",[679,1119,697],{"class":689},[679,1121,700],{"class":685},[679,1123,703],{"class":689},[679,1125,1126],{"class":706},"evlog\u002Fhono",[679,1128,710],{"class":689},[679,1130,1131,1133,1135,1137,1139,1141,1143,1145],{"class":681,"line":756},[679,1132,686],{"class":685},[679,1134,690],{"class":689},[679,1136,694],{"class":693},[679,1138,697],{"class":689},[679,1140,700],{"class":685},[679,1142,703],{"class":689},[679,1144,707],{"class":706},[679,1146,710],{"class":689},[679,1148,1149],{"class":681,"line":783},[679,1150,1013],{"emptyLinePlaceholder":1012},[679,1152,1153,1156,1159,1161,1164,1166],{"class":681,"line":792},[679,1154,1155],{"class":759},"const",[679,1157,1158],{"class":693}," app ",[679,1160,894],{"class":689},[679,1162,1163],{"class":689}," new",[679,1165,1097],{"class":737},[679,1167,1168],{"class":693},"()\n",[679,1170,1171,1174,1176,1179,1181,1184,1186,1189,1192,1195,1197,1200,1202],{"class":681,"line":801},[679,1172,1173],{"class":693},"app",[679,1175,1050],{"class":689},[679,1177,1178],{"class":737},"use",[679,1180,1027],{"class":693},[679,1182,1183],{"class":737},"evlog",[679,1185,1027],{"class":693},[679,1187,1188],{"class":689},"{",[679,1190,1191],{"class":1061}," drain",[679,1193,1194],{"class":689},":",[679,1196,694],{"class":737},[679,1198,1199],{"class":693},"() ",[679,1201,1081],{"class":689},[679,1203,1204],{"class":693},"))\n",[669,1206,1208],{"className":671,"code":1207,"filename":270,"language":674,"meta":675,"style":675},"import express from 'express'\nimport { evlog } from 'evlog\u002Fexpress'\nimport { createClickHouseDrain } from 'evlog\u002Fclickhouse'\n\nconst app = express()\napp.use(evlog({ drain: createClickHouseDrain() }))\n",[595,1209,1210,1227,1246,1264,1268,1281],{"__ignoreMap":675},[679,1211,1212,1214,1217,1220,1222,1225],{"class":681,"line":682},[679,1213,686],{"class":685},[679,1215,1216],{"class":693}," express ",[679,1218,1219],{"class":685},"from",[679,1221,703],{"class":689},[679,1223,1224],{"class":706},"express",[679,1226,710],{"class":689},[679,1228,1229,1231,1233,1235,1237,1239,1241,1244],{"class":681,"line":750},[679,1230,686],{"class":685},[679,1232,690],{"class":689},[679,1234,1117],{"class":693},[679,1236,697],{"class":689},[679,1238,700],{"class":685},[679,1240,703],{"class":689},[679,1242,1243],{"class":706},"evlog\u002Fexpress",[679,1245,710],{"class":689},[679,1247,1248,1250,1252,1254,1256,1258,1260,1262],{"class":681,"line":756},[679,1249,686],{"class":685},[679,1251,690],{"class":689},[679,1253,694],{"class":693},[679,1255,697],{"class":689},[679,1257,700],{"class":685},[679,1259,703],{"class":689},[679,1261,707],{"class":706},[679,1263,710],{"class":689},[679,1265,1266],{"class":681,"line":783},[679,1267,1013],{"emptyLinePlaceholder":1012},[679,1269,1270,1272,1274,1276,1279],{"class":681,"line":792},[679,1271,1155],{"class":759},[679,1273,1158],{"class":693},[679,1275,894],{"class":689},[679,1277,1278],{"class":737}," express",[679,1280,1168],{"class":693},[679,1282,1283,1285,1287,1289,1291,1293,1295,1297,1299,1301,1303,1305,1307],{"class":681,"line":801},[679,1284,1173],{"class":693},[679,1286,1050],{"class":689},[679,1288,1178],{"class":737},[679,1290,1027],{"class":693},[679,1292,1183],{"class":737},[679,1294,1027],{"class":693},[679,1296,1188],{"class":689},[679,1298,1191],{"class":1061},[679,1300,1194],{"class":689},[679,1302,694],{"class":737},[679,1304,1199],{"class":693},[679,1306,1081],{"class":689},[679,1308,1204],{"class":693},[669,1310,1312],{"className":671,"code":1311,"filename":280,"language":674,"meta":675,"style":675},"import Fastify from 'fastify'\nimport { evlog } from 'evlog\u002Ffastify'\nimport { createClickHouseDrain } from 'evlog\u002Fclickhouse'\n\nconst app = Fastify()\nawait app.register(evlog, { drain: createClickHouseDrain() })\n",[595,1313,1314,1330,1349,1367,1371,1384],{"__ignoreMap":675},[679,1315,1316,1318,1321,1323,1325,1328],{"class":681,"line":682},[679,1317,686],{"class":685},[679,1319,1320],{"class":693}," Fastify ",[679,1322,1219],{"class":685},[679,1324,703],{"class":689},[679,1326,1327],{"class":706},"fastify",[679,1329,710],{"class":689},[679,1331,1332,1334,1336,1338,1340,1342,1344,1347],{"class":681,"line":750},[679,1333,686],{"class":685},[679,1335,690],{"class":689},[679,1337,1117],{"class":693},[679,1339,697],{"class":689},[679,1341,700],{"class":685},[679,1343,703],{"class":689},[679,1345,1346],{"class":706},"evlog\u002Ffastify",[679,1348,710],{"class":689},[679,1350,1351,1353,1355,1357,1359,1361,1363,1365],{"class":681,"line":756},[679,1352,686],{"class":685},[679,1354,690],{"class":689},[679,1356,694],{"class":693},[679,1358,697],{"class":689},[679,1360,700],{"class":685},[679,1362,703],{"class":689},[679,1364,707],{"class":706},[679,1366,710],{"class":689},[679,1368,1369],{"class":681,"line":783},[679,1370,1013],{"emptyLinePlaceholder":1012},[679,1372,1373,1375,1377,1379,1382],{"class":681,"line":792},[679,1374,1155],{"class":759},[679,1376,1158],{"class":693},[679,1378,894],{"class":689},[679,1380,1381],{"class":737}," Fastify",[679,1383,1168],{"class":693},[679,1385,1386,1389,1392,1394,1397,1400,1402,1404,1406,1408,1410,1412,1414],{"class":681,"line":801},[679,1387,1388],{"class":685},"await",[679,1390,1391],{"class":693}," app",[679,1393,1050],{"class":689},[679,1395,1396],{"class":737},"register",[679,1398,1399],{"class":693},"(evlog",[679,1401,1071],{"class":689},[679,1403,690],{"class":689},[679,1405,1191],{"class":1061},[679,1407,1194],{"class":689},[679,1409,694],{"class":737},[679,1411,1199],{"class":693},[679,1413,1081],{"class":689},[679,1415,885],{"class":693},[669,1417,1419],{"className":671,"code":1418,"filename":285,"language":674,"meta":675,"style":675},"import { Elysia } from 'elysia'\nimport { evlog } from 'evlog\u002Felysia'\nimport { createClickHouseDrain } from 'evlog\u002Fclickhouse'\n\nconst app = new Elysia().use(evlog({ drain: createClickHouseDrain() }))\n",[595,1420,1421,1441,1460,1478,1482],{"__ignoreMap":675},[679,1422,1423,1425,1427,1430,1432,1434,1436,1439],{"class":681,"line":682},[679,1424,686],{"class":685},[679,1426,690],{"class":689},[679,1428,1429],{"class":693}," Elysia",[679,1431,697],{"class":689},[679,1433,700],{"class":685},[679,1435,703],{"class":689},[679,1437,1438],{"class":706},"elysia",[679,1440,710],{"class":689},[679,1442,1443,1445,1447,1449,1451,1453,1455,1458],{"class":681,"line":750},[679,1444,686],{"class":685},[679,1446,690],{"class":689},[679,1448,1117],{"class":693},[679,1450,697],{"class":689},[679,1452,700],{"class":685},[679,1454,703],{"class":689},[679,1456,1457],{"class":706},"evlog\u002Felysia",[679,1459,710],{"class":689},[679,1461,1462,1464,1466,1468,1470,1472,1474,1476],{"class":681,"line":756},[679,1463,686],{"class":685},[679,1465,690],{"class":689},[679,1467,694],{"class":693},[679,1469,697],{"class":689},[679,1471,700],{"class":685},[679,1473,703],{"class":689},[679,1475,707],{"class":706},[679,1477,710],{"class":689},[679,1479,1480],{"class":681,"line":783},[679,1481,1013],{"emptyLinePlaceholder":1012},[679,1483,1484,1486,1488,1490,1492,1494,1497,1499,1501,1503,1505,1507,1509,1511,1513,1515,1517,1519],{"class":681,"line":792},[679,1485,1155],{"class":759},[679,1487,1158],{"class":693},[679,1489,894],{"class":689},[679,1491,1163],{"class":689},[679,1493,1429],{"class":737},[679,1495,1496],{"class":693},"()",[679,1498,1050],{"class":689},[679,1500,1178],{"class":737},[679,1502,1027],{"class":693},[679,1504,1183],{"class":737},[679,1506,1027],{"class":693},[679,1508,1188],{"class":689},[679,1510,1191],{"class":1061},[679,1512,1194],{"class":689},[679,1514,694],{"class":737},[679,1516,1199],{"class":693},[679,1518,1081],{"class":689},[679,1520,1204],{"class":693},[669,1522,1524],{"className":671,"code":1523,"filename":265,"language":674,"meta":675,"style":675},"import { Module } from '@nestjs\u002Fcommon'\nimport { EvlogModule } from 'evlog\u002Fnestjs'\nimport { createClickHouseDrain } from 'evlog\u002Fclickhouse'\n\n@Module({\n  imports: [EvlogModule.forRoot({ drain: createClickHouseDrain() })],\n})\nexport class AppModule {}\n",[595,1525,1526,1546,1566,1584,1588,1601,1636,1642],{"__ignoreMap":675},[679,1527,1528,1530,1532,1535,1537,1539,1541,1544],{"class":681,"line":682},[679,1529,686],{"class":685},[679,1531,690],{"class":689},[679,1533,1534],{"class":693}," Module",[679,1536,697],{"class":689},[679,1538,700],{"class":685},[679,1540,703],{"class":689},[679,1542,1543],{"class":706},"@nestjs\u002Fcommon",[679,1545,710],{"class":689},[679,1547,1548,1550,1552,1555,1557,1559,1561,1564],{"class":681,"line":750},[679,1549,686],{"class":685},[679,1551,690],{"class":689},[679,1553,1554],{"class":693}," EvlogModule",[679,1556,697],{"class":689},[679,1558,700],{"class":685},[679,1560,703],{"class":689},[679,1562,1563],{"class":706},"evlog\u002Fnestjs",[679,1565,710],{"class":689},[679,1567,1568,1570,1572,1574,1576,1578,1580,1582],{"class":681,"line":756},[679,1569,686],{"class":685},[679,1571,690],{"class":689},[679,1573,694],{"class":693},[679,1575,697],{"class":689},[679,1577,700],{"class":685},[679,1579,703],{"class":689},[679,1581,707],{"class":706},[679,1583,710],{"class":689},[679,1585,1586],{"class":681,"line":783},[679,1587,1013],{"emptyLinePlaceholder":1012},[679,1589,1590,1593,1596,1598],{"class":681,"line":792},[679,1591,1592],{"class":689},"@",[679,1594,1595],{"class":737},"Module",[679,1597,1027],{"class":693},[679,1599,1600],{"class":689},"{\n",[679,1602,1603,1606,1608,1611,1613,1616,1618,1620,1622,1624,1626,1628,1630,1633],{"class":681,"line":801},[679,1604,1605],{"class":1061},"  imports",[679,1607,1194],{"class":689},[679,1609,1610],{"class":693}," [EvlogModule",[679,1612,1050],{"class":689},[679,1614,1615],{"class":737},"forRoot",[679,1617,1027],{"class":693},[679,1619,1188],{"class":689},[679,1621,1191],{"class":1061},[679,1623,1194],{"class":689},[679,1625,694],{"class":737},[679,1627,1199],{"class":693},[679,1629,1081],{"class":689},[679,1631,1632],{"class":693},")]",[679,1634,1635],{"class":689},",\n",[679,1637,1638,1640],{"class":681,"line":807},[679,1639,1081],{"class":689},[679,1641,885],{"class":693},[679,1643,1644,1646,1649,1653],{"class":681,"line":813},[679,1645,1018],{"class":685},[679,1647,1648],{"class":759}," class",[679,1650,1652],{"class":1651},"sBMFI"," AppModule",[679,1654,1655],{"class":689}," {}\n",[669,1657,1659],{"className":671,"code":1658,"filename":300,"language":674,"meta":675,"style":675},"import { initLogger } from 'evlog'\nimport { createClickHouseDrain } from 'evlog\u002Fclickhouse'\n\ninitLogger({\n  env: { service: 'my-app' },\n  drain: createClickHouseDrain(),\n})\n",[595,1660,1661,1680,1698,1702,1711,1735,1748],{"__ignoreMap":675},[679,1662,1663,1665,1667,1670,1672,1674,1676,1678],{"class":681,"line":682},[679,1664,686],{"class":685},[679,1666,690],{"class":689},[679,1668,1669],{"class":693}," initLogger",[679,1671,697],{"class":689},[679,1673,700],{"class":685},[679,1675,703],{"class":689},[679,1677,1183],{"class":706},[679,1679,710],{"class":689},[679,1681,1682,1684,1686,1688,1690,1692,1694,1696],{"class":681,"line":750},[679,1683,686],{"class":685},[679,1685,690],{"class":689},[679,1687,694],{"class":693},[679,1689,697],{"class":689},[679,1691,700],{"class":685},[679,1693,703],{"class":689},[679,1695,707],{"class":706},[679,1697,710],{"class":689},[679,1699,1700],{"class":681,"line":756},[679,1701,1013],{"emptyLinePlaceholder":1012},[679,1703,1704,1707,1709],{"class":681,"line":783},[679,1705,1706],{"class":737},"initLogger",[679,1708,1027],{"class":693},[679,1710,1600],{"class":689},[679,1712,1713,1716,1718,1720,1723,1725,1727,1730,1732],{"class":681,"line":792},[679,1714,1715],{"class":1061},"  env",[679,1717,1194],{"class":689},[679,1719,690],{"class":689},[679,1721,1722],{"class":1061}," service",[679,1724,1194],{"class":689},[679,1726,703],{"class":689},[679,1728,1729],{"class":706},"my-app",[679,1731,772],{"class":689},[679,1733,1734],{"class":689}," },\n",[679,1736,1737,1740,1742,1744,1746],{"class":681,"line":801},[679,1738,1739],{"class":1061},"  drain",[679,1741,1194],{"class":689},[679,1743,694],{"class":737},[679,1745,1496],{"class":693},[679,1747,1635],{"class":689},[679,1749,1750,1752],{"class":681,"line":807},[679,1751,1081],{"class":689},[679,1753,885],{"class":693},[662,1755,521],{"id":1756},"configuration",[1758,1759,1761],"h3",{"id":1760},"environment-variables","Environment variables",[1763,1764,1765,1781],"table",{},[1766,1767,1768],"thead",{},[1769,1770,1771,1775,1778],"tr",{},[1772,1773,1774],"th",{},"Variable",[1772,1776,1777],{},"Required",[1772,1779,1780],{},"Description",[1782,1783,1784,1802,1818,1830,1844],"tbody",{},[1769,1785,1786,1792,1795],{},[1787,1788,1789],"td",{},[595,1790,1791],{},"CLICKHOUSE_ENDPOINT",[1787,1793,1794],{},"Yes",[1787,1796,1797,1798,1801],{},"HTTP interface URL (",[595,1799,1800],{},"CLICKHOUSE_URL"," also accepted)",[1769,1803,1804,1809,1812],{},[1787,1805,1806],{},[595,1807,1808],{},"CLICKHOUSE_USER",[1787,1810,1811],{},"No",[1787,1813,1814,1815],{},"Username. Default ",[595,1816,1817],{},"default",[1769,1819,1820,1825,1827],{},[1787,1821,1822],{},[595,1823,1824],{},"CLICKHOUSE_PASSWORD",[1787,1826,1811],{},[1787,1828,1829],{},"Password. Omit for an unauthenticated local instance",[1769,1831,1832,1837,1839],{},[1787,1833,1834],{},[595,1835,1836],{},"CLICKHOUSE_DATABASE",[1787,1838,1811],{},[1787,1840,1841,1842],{},"Database. Default ",[595,1843,1817],{},[1769,1845,1846,1851,1853],{},[1787,1847,1848],{},[595,1849,1850],{},"CLICKHOUSE_TABLE",[1787,1852,1811],{},[1787,1854,1855,1856],{},"Table. Default ",[595,1857,1858],{},"evlog_events",[1758,1860,346],{"id":1861},"options",[1763,1863,1864,1879],{},[1766,1865,1866],{},[1769,1867,1868,1871,1874,1877],{},[1772,1869,1870],{},"Option",[1772,1872,1873],{},"Type",[1772,1875,1876],{},"Default",[1772,1878,1780],{},[1782,1880,1881,1899,1917,1934,1952,1968,1988,2007,2027,2047],{},[1769,1882,1883,1888,1893,1896],{},[1787,1884,1885],{},[595,1886,1887],{},"endpoint",[1787,1889,1890],{},[595,1891,1892],{},"string",[1787,1894,1895],{},"—",[1787,1897,1898],{},"HTTP interface URL",[1769,1900,1901,1906,1910,1914],{},[1787,1902,1903],{},[595,1904,1905],{},"database",[1787,1907,1908],{},[595,1909,1892],{},[1787,1911,1912],{},[595,1913,1817],{},[1787,1915,1916],{},"Target database",[1769,1918,1919,1923,1927,1931],{},[1787,1920,1921],{},[595,1922,1763],{},[1787,1924,1925],{},[595,1926,1892],{},[1787,1928,1929],{},[595,1930,1858],{},[1787,1932,1933],{},"Target table",[1769,1935,1936,1941,1945,1949],{},[1787,1937,1938],{},[595,1939,1940],{},"username",[1787,1942,1943],{},[595,1944,1892],{},[1787,1946,1947],{},[595,1948,1817],{},[1787,1950,1951],{},"Username",[1769,1953,1954,1959,1963,1965],{},[1787,1955,1956],{},[595,1957,1958],{},"password",[1787,1960,1961],{},[595,1962,1892],{},[1787,1964,1895],{},[1787,1966,1967],{},"Password",[1769,1969,1970,1975,1980,1985],{},[1787,1971,1972],{},[595,1973,1974],{},"asyncInsert",[1787,1976,1977],{},[595,1978,1979],{},"boolean",[1787,1981,1982],{},[595,1983,1984],{},"true",[1787,1986,1987],{},"Batch inserts server-side",[1769,1989,1990,1995,1999,2004],{},[1787,1991,1992],{},[595,1993,1994],{},"waitForAsyncInsert",[1787,1996,1997],{},[595,1998,1979],{},[1787,2000,2001],{},[595,2002,2003],{},"false",[1787,2005,2006],{},"Wait for the flush before responding",[1769,2008,2009,2014,2019,2024],{},[1787,2010,2011],{},[595,2012,2013],{},"transform",[1787,2015,2016],{},[595,2017,2018],{},"(event) => Record\u003Cstring, unknown>",[1787,2020,2021],{},[595,2022,2023],{},"toClickHouseRow",[1787,2025,2026],{},"Map an event to a row",[1769,2028,2029,2034,2039,2044],{},[1787,2030,2031],{},[595,2032,2033],{},"timeout",[1787,2035,2036],{},[595,2037,2038],{},"number",[1787,2040,2041],{},[595,2042,2043],{},"5000",[1787,2045,2046],{},"Request timeout in ms",[1769,2048,2049,2054,2058,2063],{},[1787,2050,2051],{},[595,2052,2053],{},"retries",[1787,2055,2056],{},[595,2057,2038],{},[1787,2059,2060],{},[595,2061,2062],{},"2",[1787,2064,2065],{},"Retry attempts",[662,2067,2069],{"id":2068},"deployment","Deployment",[583,2071,2072],{},"The adapter is identical either way. Only the endpoint and credentials change.",[1758,2074,2076],{"id":2075},"self-hosted","Self-hosted",[583,2078,2079],{},"A local or self-managed instance, with or without auth:",[669,2081,2084],{"className":671,"code":2082,"filename":2083,"language":674,"meta":675,"style":675},"createClickHouseDrain({ endpoint: 'http:\u002F\u002Flocalhost:8123' })\n","server\u002Fplugins\u002Fevlog.ts",[595,2085,2086],{"__ignoreMap":675},[679,2087,2088,2091,2093,2095,2098,2100,2102,2104,2106,2108],{"class":681,"line":682},[679,2089,2090],{"class":737},"createClickHouseDrain",[679,2092,1027],{"class":693},[679,2094,1188],{"class":689},[679,2096,2097],{"class":1061}," endpoint",[679,2099,1194],{"class":689},[679,2101,703],{"class":689},[679,2103,643],{"class":706},[679,2105,772],{"class":689},[679,2107,697],{"class":689},[679,2109,885],{"class":693},[669,2111,2116],{"className":2112,"code":2113,"filename":2114,"language":2115,"meta":675,"style":675},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","CLICKHOUSE_ENDPOINT=http:\u002F\u002Flocalhost:8123\n# Only if your instance requires auth:\nCLICKHOUSE_USER=evlog\nCLICKHOUSE_PASSWORD=your-password\n",".env","bash",[595,2117,2118,2127,2132,2141],{"__ignoreMap":675},[679,2119,2120,2122,2124],{"class":681,"line":682},[679,2121,1791],{"class":693},[679,2123,894],{"class":689},[679,2125,2126],{"class":706},"http:\u002F\u002Flocalhost:8123\n",[679,2128,2129],{"class":681,"line":750},[679,2130,2131],{"class":988},"# Only if your instance requires auth:\n",[679,2133,2134,2136,2138],{"class":681,"line":756},[679,2135,1808],{"class":693},[679,2137,894],{"class":689},[679,2139,2140],{"class":706},"evlog\n",[679,2142,2143,2145,2147],{"class":681,"line":783},[679,2144,1824],{"class":693},[679,2146,894],{"class":689},[679,2148,2149],{"class":706},"your-password\n",[583,2151,2152,2153,2155,2156,2158,2159,2161,2162,2164],{},"A fresh container runs as ",[595,2154,1817],{}," with no password, which is why ",[595,2157,1940],{},"\ndefaults to ",[595,2160,1817],{}," and ",[595,2163,1958],{}," is optional.",[1758,2166,2168],{"id":2167},"clickhouse-cloud","ClickHouse Cloud",[583,2170,2171],{},"Cloud services always require credentials and speak HTTPS on port 8443:",[669,2173,2175],{"className":671,"code":2174,"filename":2083,"language":674,"meta":675,"style":675},"createClickHouseDrain({\n  endpoint: 'https:\u002F\u002Fabc123.eu-west-1.aws.clickhouse.cloud:8443',\n  password: process.env.CLICKHOUSE_PASSWORD,\n  database: 'logs',\n})\n",[595,2176,2177,2185,2201,2222,2238],{"__ignoreMap":675},[679,2178,2179,2181,2183],{"class":681,"line":682},[679,2180,2090],{"class":737},[679,2182,1027],{"class":693},[679,2184,1600],{"class":689},[679,2186,2187,2190,2192,2194,2197,2199],{"class":681,"line":750},[679,2188,2189],{"class":1061},"  endpoint",[679,2191,1194],{"class":689},[679,2193,703],{"class":689},[679,2195,2196],{"class":706},"https:\u002F\u002Fabc123.eu-west-1.aws.clickhouse.cloud:8443",[679,2198,772],{"class":689},[679,2200,1635],{"class":689},[679,2202,2203,2206,2208,2211,2213,2216,2218,2220],{"class":681,"line":756},[679,2204,2205],{"class":1061},"  password",[679,2207,1194],{"class":689},[679,2209,2210],{"class":693}," process",[679,2212,1050],{"class":689},[679,2214,2215],{"class":693},"env",[679,2217,1050],{"class":689},[679,2219,1824],{"class":693},[679,2221,1635],{"class":689},[679,2223,2224,2227,2229,2231,2234,2236],{"class":681,"line":783},[679,2225,2226],{"class":1061},"  database",[679,2228,1194],{"class":689},[679,2230,703],{"class":689},[679,2232,2233],{"class":706},"logs",[679,2235,772],{"class":689},[679,2237,1635],{"class":689},[679,2239,2240,2242],{"class":681,"line":792},[679,2241,1081],{"class":689},[679,2243,885],{"class":693},[669,2245,2247],{"className":2112,"code":2246,"filename":2114,"language":2115,"meta":675,"style":675},"CLICKHOUSE_ENDPOINT=https:\u002F\u002Fabc123.eu-west-1.aws.clickhouse.cloud:8443\nCLICKHOUSE_PASSWORD=your-service-password\nCLICKHOUSE_DATABASE=logs\n",[595,2248,2249,2258,2267],{"__ignoreMap":675},[679,2250,2251,2253,2255],{"class":681,"line":682},[679,2252,1791],{"class":693},[679,2254,894],{"class":689},[679,2256,2257],{"class":706},"https:\u002F\u002Fabc123.eu-west-1.aws.clickhouse.cloud:8443\n",[679,2259,2260,2262,2264],{"class":681,"line":750},[679,2261,1824],{"class":693},[679,2263,894],{"class":689},[679,2265,2266],{"class":706},"your-service-password\n",[679,2268,2269,2271,2273],{"class":681,"line":756},[679,2270,1836],{"class":693},[679,2272,894],{"class":689},[679,2274,2275],{"class":706},"logs\n",[961,2277,2278,2279,2283,2284,2287,2288,2290],{"color":963,"icon":13},"Copy the endpoint from ",[2280,2281,2282],"em",{},"Connect → HTTPS"," in the ClickHouse Cloud console,\nincluding the ",[595,2285,2286],{},":8443"," port. Cloud services idle-suspend, so the first insert\nafter a pause can take a few seconds; raise ",[595,2289,2033],{}," if you see aborts.",[961,2292,2294,2295,2298,2299,2302,2303,2306,2307,2310],{"color":2293,"icon":388},"success","Credentials are sent as ",[595,2296,2297],{},"X-ClickHouse-User"," \u002F ",[595,2300,2301],{},"X-ClickHouse-Key"," ",[603,2304,2305],{},"headers",",\nnever as query parameters, so they never reach ",[595,2308,2309],{},"system.query_log"," or an\nintermediate proxy's access log.",[662,2312,2314],{"id":2313},"verify-it-locally","Verify it locally",[583,2316,2317],{},"Spin up ClickHouse in Docker, create the table and push a real event:",[669,2319,2322],{"className":2112,"code":2320,"filename":2321,"language":2115,"meta":675,"style":675},"docker compose -f packages\u002Fevlog\u002Ftest\u002Fe2e\u002Fdocker-compose.yml up -d\nCLICKHOUSE_ENDPOINT=http:\u002F\u002Flocalhost:8123 pnpm run test:e2e\ndocker compose -f packages\u002Fevlog\u002Ftest\u002Fe2e\u002Fdocker-compose.yml down -v\n","Terminal",[595,2323,2324,2344,2361],{"__ignoreMap":675},[679,2325,2326,2329,2332,2335,2338,2341],{"class":681,"line":682},[679,2327,2328],{"class":1651},"docker",[679,2330,2331],{"class":706}," compose",[679,2333,2334],{"class":706}," -f",[679,2336,2337],{"class":706}," packages\u002Fevlog\u002Ftest\u002Fe2e\u002Fdocker-compose.yml",[679,2339,2340],{"class":706}," up",[679,2342,2343],{"class":706}," -d\n",[679,2345,2346,2348,2350,2352,2355,2358],{"class":681,"line":750},[679,2347,1791],{"class":693},[679,2349,894],{"class":689},[679,2351,643],{"class":706},[679,2353,2354],{"class":1651}," pnpm",[679,2356,2357],{"class":706}," run",[679,2359,2360],{"class":706}," test:e2e\n",[679,2362,2363,2365,2367,2369,2371,2374],{"class":681,"line":756},[679,2364,2328],{"class":1651},[679,2366,2331],{"class":706},[679,2368,2334],{"class":706},[679,2370,2337],{"class":706},[679,2372,2373],{"class":706}," down",[679,2375,2376],{"class":706}," -v\n",[583,2378,2379,2380,2383,2384,2387,2388,2390,2391,2393,2394,2396],{},"The suite is a ",[603,2381,2382],{},"round-trip",": it inserts events, reads them back with\n",[595,2385,2386],{},"SELECT",", and asserts the typed columns and the ",[595,2389,609],{}," JSON survived. The\ncompose file creates ",[595,2392,1858],{}," from the schema above on first boot.\nWithout ",[595,2395,1791],{}," it skips itself with a visible label.",[583,2398,2399,2400,2403],{},"To ",[2280,2401,2402],{},"see"," the events rather than assert on them, seed the sandbox and open the\nprovisioned dashboard. The stack ships a Grafana with the ClickHouse\ndatasource already wired up:",[669,2405,2407],{"className":2112,"code":2406,"filename":2321,"language":2115,"meta":675,"style":675},"pnpm run sandbox:up\npnpm run sandbox:seed\n# → http:\u002F\u002Flocalhost:3001\u002Fd\u002Fevlog-wide-events\n",[595,2408,2409,2419,2428],{"__ignoreMap":675},[679,2410,2411,2414,2416],{"class":681,"line":682},[679,2412,2413],{"class":1651},"pnpm",[679,2415,2357],{"class":706},[679,2417,2418],{"class":706}," sandbox:up\n",[679,2420,2421,2423,2425],{"class":681,"line":750},[679,2422,2413],{"class":1651},[679,2424,2357],{"class":706},[679,2426,2427],{"class":706}," sandbox:seed\n",[679,2429,2430],{"class":681,"line":756},[679,2431,2432],{"class":988},"# → http:\u002F\u002Flocalhost:3001\u002Fd\u002Fevlog-wide-events\n",[583,2434,2435,2436,2439,2440,2443],{},"ClickHouse's built-in ",[595,2437,2438],{},"\u002Fplay"," page at ",[595,2441,2442],{},"http:\u002F\u002Flocalhost:8123\u002Fplay"," also works\nfor raw SQL, but it is deliberately minimal, and the dashboard is the better\nstarting point.",[662,2445,2447],{"id":2446},"async-inserts","Async inserts",[583,2449,2450,2451,2456,2457,2460],{},"Log ingestion means many small inserts, and one MergeTree part per request would quickly degrade a table. The adapter therefore enables ",[587,2452,2455],{"href":2453,"rel":2454},"https:\u002F\u002Fclickhouse.com\u002Fdocs\u002Fen\u002Foptimize\u002Fasynchronous-inserts",[591],"asynchronous inserts"," by default, and does ",[603,2458,2459],{},"not"," wait for the flush:",[669,2462,2467],{"className":2463,"code":2465,"language":2466},[2464],"language-text","async_insert=1&wait_for_async_insert=0\n","text",[595,2468,2465],{"__ignoreMap":675},[583,2470,2471],{},"ClickHouse buffers rows server-side and writes them in batches. Draining never blocks a request on disk writes.",[583,2473,2474,2475,2478,2479,2482,2483,1050],{},"Set ",[595,2476,2477],{},"waitForAsyncInsert: true"," if you need the insert acknowledged as durable before the drain resolves, at the cost of latency. Set ",[595,2480,2481],{},"asyncInsert: false"," to insert synchronously, which only makes sense when you already batch client-side with ",[595,2484,2485],{},"evlog\u002Fpipeline",[662,2487,2489],{"id":2488},"querying","Querying",[583,2491,2492,2493,2495],{},"Typed columns are indexed by the sort key; everything else lives in ",[595,2494,609],{}," and is reachable with ClickHouse's JSON functions:",[669,2497,2499],{"className":720,"code":2498,"language":723,"meta":675,"style":675},"-- Error rate per service over the last hour\nSELECT service, countIf(level = 'error') \u002F count() AS error_rate\nFROM evlog_events\nWHERE timestamp > now() - INTERVAL 1 HOUR\nGROUP BY service;\n",[595,2500,2501,2506,2544,2551,2578],{"__ignoreMap":675},[679,2502,2503],{"class":681,"line":682},[679,2504,2505],{"class":988},"-- Error rate per service over the last hour\n",[679,2507,2508,2510,2512,2515,2518,2521,2523,2526,2528,2530,2533,2536,2538,2541],{"class":681,"line":750},[679,2509,2386],{"class":730},[679,2511,1722],{"class":730},[679,2513,2514],{"class":693},", countIf(",[679,2516,2517],{"class":730},"level",[679,2519,2520],{"class":689}," =",[679,2522,703],{"class":689},[679,2524,2525],{"class":706},"error",[679,2527,772],{"class":689},[679,2529,944],{"class":693},[679,2531,2532],{"class":689},"\u002F",[679,2534,2535],{"class":737}," count",[679,2537,1199],{"class":693},[679,2539,2540],{"class":730},"AS",[679,2542,2543],{"class":693}," error_rate\n",[679,2545,2546,2549],{"class":681,"line":756},[679,2547,2548],{"class":730},"FROM",[679,2550,747],{"class":693},[679,2552,2553,2556,2559,2562,2565,2567,2570,2572,2575],{"class":681,"line":783},[679,2554,2555],{"class":730},"WHERE",[679,2557,2558],{"class":759}," timestamp",[679,2560,2561],{"class":689}," >",[679,2563,2564],{"class":730}," now",[679,2566,1496],{"class":689},[679,2568,2569],{"class":689}," -",[679,2571,950],{"class":693},[679,2573,2574],{"class":730},"1",[679,2576,2577],{"class":730}," HOUR\n",[679,2579,2580,2583,2585],{"class":681,"line":792},[679,2581,2582],{"class":730},"GROUP BY",[679,2584,1722],{"class":730},[679,2586,959],{"class":693},[669,2588,2590],{"className":720,"code":2589,"language":723,"meta":675,"style":675},"-- Slowest routes\nSELECT path, count() AS hits, avg(duration_ms) AS avg_ms, quantile(0.95)(duration_ms) AS p95_ms\nFROM evlog_events\nWHERE timestamp > now() - INTERVAL 1 DAY AND method = 'GET' AND duration_ms IS NOT NULL\nGROUP BY path\nORDER BY avg_ms DESC\nLIMIT 20;\n",[595,2591,2592,2597,2643,2649,2692,2699,2709],{"__ignoreMap":675},[679,2593,2594],{"class":681,"line":682},[679,2595,2596],{"class":988},"-- Slowest routes\n",[679,2598,2599,2601,2604,2606,2609,2611,2613,2616,2619,2622,2624,2627,2630,2632,2635,2638,2640],{"class":681,"line":750},[679,2600,2386],{"class":730},[679,2602,2603],{"class":759}," path",[679,2605,769],{"class":693},[679,2607,2608],{"class":737},"count",[679,2610,1199],{"class":693},[679,2612,2540],{"class":730},[679,2614,2615],{"class":693}," hits, ",[679,2617,2618],{"class":737},"avg",[679,2620,2621],{"class":693},"(duration_ms) ",[679,2623,2540],{"class":730},[679,2625,2626],{"class":693}," avg_ms, quantile(",[679,2628,2629],{"class":730},"0",[679,2631,1050],{"class":693},[679,2633,2634],{"class":730},"95",[679,2636,2637],{"class":693},")(duration_ms) ",[679,2639,2540],{"class":730},[679,2641,2642],{"class":693}," p95_ms\n",[679,2644,2645,2647],{"class":681,"line":756},[679,2646,2548],{"class":730},[679,2648,747],{"class":693},[679,2650,2651,2653,2655,2657,2659,2661,2663,2665,2667,2669,2672,2675,2677,2679,2682,2684,2686,2689],{"class":681,"line":783},[679,2652,2555],{"class":730},[679,2654,2558],{"class":759},[679,2656,2561],{"class":689},[679,2658,2564],{"class":730},[679,2660,1496],{"class":689},[679,2662,2569],{"class":689},[679,2664,950],{"class":693},[679,2666,2574],{"class":730},[679,2668,956],{"class":730},[679,2670,2671],{"class":730}," AND",[679,2673,2674],{"class":693}," method ",[679,2676,894],{"class":689},[679,2678,703],{"class":689},[679,2680,2681],{"class":706},"GET",[679,2683,772],{"class":689},[679,2685,2671],{"class":730},[679,2687,2688],{"class":693}," duration_ms ",[679,2690,2691],{"class":730},"IS NOT NULL\n",[679,2693,2694,2696],{"class":681,"line":792},[679,2695,2582],{"class":730},[679,2697,2698],{"class":759}," path\n",[679,2700,2701,2703,2706],{"class":681,"line":801},[679,2702,920],{"class":730},[679,2704,2705],{"class":693}," avg_ms ",[679,2707,2708],{"class":730},"DESC\n",[679,2710,2711,2714,2717],{"class":681,"line":807},[679,2712,2713],{"class":730},"LIMIT",[679,2715,2716],{"class":730}," 20",[679,2718,959],{"class":693},[669,2720,2722],{"className":720,"code":2721,"language":723,"meta":675,"style":675},"-- One request end to end\nSELECT timestamp, level, path, status, data\nFROM evlog_events\nWHERE request_id = '4a8ff3a8-...'\nORDER BY timestamp;\n",[595,2723,2724,2729,2754,2760,2776],{"__ignoreMap":675},[679,2725,2726],{"class":681,"line":682},[679,2727,2728],{"class":988},"-- One request end to end\n",[679,2730,2731,2733,2735,2737,2739,2741,2744,2746,2749,2751],{"class":681,"line":750},[679,2732,2386],{"class":730},[679,2734,2558],{"class":759},[679,2736,769],{"class":693},[679,2738,2517],{"class":730},[679,2740,769],{"class":693},[679,2742,2743],{"class":759},"path",[679,2745,769],{"class":693},[679,2747,2748],{"class":730},"status",[679,2750,769],{"class":693},[679,2752,2753],{"class":730},"data\n",[679,2755,2756,2758],{"class":681,"line":756},[679,2757,2548],{"class":730},[679,2759,747],{"class":693},[679,2761,2762,2764,2767,2769,2771,2774],{"class":681,"line":783},[679,2763,2555],{"class":730},[679,2765,2766],{"class":693}," request_id ",[679,2768,894],{"class":689},[679,2770,703],{"class":689},[679,2772,2773],{"class":706},"4a8ff3a8-...",[679,2775,710],{"class":689},[679,2777,2778,2780,2782],{"class":681,"line":792},[679,2779,920],{"class":730},[679,2781,2558],{"class":759},[679,2783,959],{"class":693},[669,2785,2787],{"className":720,"code":2786,"language":723,"meta":675,"style":675},"-- Reach into a custom field kept only in data\nSELECT JSONExtractString(data, 'user', 'plan') AS plan, count()\nFROM evlog_events\nWHERE timestamp > now() - INTERVAL 7 DAY\nGROUP BY plan;\n",[595,2788,2789,2794,2832,2838,2860],{"__ignoreMap":675},[679,2790,2791],{"class":681,"line":682},[679,2792,2793],{"class":988},"-- Reach into a custom field kept only in data\n",[679,2795,2796,2798,2801,2803,2805,2807,2810,2812,2814,2816,2819,2821,2823,2825,2828,2830],{"class":681,"line":750},[679,2797,2386],{"class":730},[679,2799,2800],{"class":693}," JSONExtractString(",[679,2802,609],{"class":730},[679,2804,769],{"class":693},[679,2806,772],{"class":689},[679,2808,2809],{"class":706},"user",[679,2811,772],{"class":689},[679,2813,769],{"class":693},[679,2815,772],{"class":689},[679,2817,2818],{"class":706},"plan",[679,2820,772],{"class":689},[679,2822,944],{"class":693},[679,2824,2540],{"class":730},[679,2826,2827],{"class":693}," plan, ",[679,2829,2608],{"class":737},[679,2831,1168],{"class":693},[679,2833,2834,2836],{"class":681,"line":756},[679,2835,2548],{"class":730},[679,2837,747],{"class":693},[679,2839,2840,2842,2844,2846,2848,2850,2852,2854,2857],{"class":681,"line":783},[679,2841,2555],{"class":730},[679,2843,2558],{"class":759},[679,2845,2561],{"class":689},[679,2847,2564],{"class":730},[679,2849,1496],{"class":689},[679,2851,2569],{"class":689},[679,2853,950],{"class":693},[679,2855,2856],{"class":730},"7",[679,2858,2859],{"class":730}," DAY\n",[679,2861,2862,2864],{"class":681,"line":792},[679,2863,2582],{"class":730},[679,2865,2866],{"class":693}," plan;\n",[662,2868,2870],{"id":2869},"custom-schema","Custom schema",[583,2872,2873,2874,2876],{},"Pass ",[595,2875,2013],{}," to target a table of your own shape:",[669,2878,2880],{"className":671,"code":2879,"filename":2083,"language":674,"meta":675,"style":675},"import { createClickHouseDrain } from 'evlog\u002Fclickhouse'\n\ncreateClickHouseDrain({\n  table: 'app_logs',\n  transform: event => ({\n    ts: event.timestamp,\n    lvl: event.level,\n    svc: event.service,\n    payload: JSON.stringify(event),\n  }),\n})\n",[595,2881,2882,2900,2904,2912,2928,2944,2959,2974,2989,3009,3018],{"__ignoreMap":675},[679,2883,2884,2886,2888,2890,2892,2894,2896,2898],{"class":681,"line":682},[679,2885,686],{"class":685},[679,2887,690],{"class":689},[679,2889,694],{"class":693},[679,2891,697],{"class":689},[679,2893,700],{"class":685},[679,2895,703],{"class":689},[679,2897,707],{"class":706},[679,2899,710],{"class":689},[679,2901,2902],{"class":681,"line":750},[679,2903,1013],{"emptyLinePlaceholder":1012},[679,2905,2906,2908,2910],{"class":681,"line":756},[679,2907,2090],{"class":737},[679,2909,1027],{"class":693},[679,2911,1600],{"class":689},[679,2913,2914,2917,2919,2921,2924,2926],{"class":681,"line":783},[679,2915,2916],{"class":1061},"  table",[679,2918,1194],{"class":689},[679,2920,703],{"class":689},[679,2922,2923],{"class":706},"app_logs",[679,2925,772],{"class":689},[679,2927,1635],{"class":689},[679,2929,2930,2933,2935,2938,2940,2942],{"class":681,"line":792},[679,2931,2932],{"class":737},"  transform",[679,2934,1194],{"class":689},[679,2936,2937],{"class":1032}," event",[679,2939,1039],{"class":759},[679,2941,923],{"class":693},[679,2943,1600],{"class":689},[679,2945,2946,2949,2951,2953,2955,2957],{"class":681,"line":801},[679,2947,2948],{"class":1061},"    ts",[679,2950,1194],{"class":689},[679,2952,2937],{"class":693},[679,2954,1050],{"class":689},[679,2956,912],{"class":693},[679,2958,1635],{"class":689},[679,2960,2961,2964,2966,2968,2970,2972],{"class":681,"line":807},[679,2962,2963],{"class":1061},"    lvl",[679,2965,1194],{"class":689},[679,2967,2937],{"class":693},[679,2969,1050],{"class":689},[679,2971,2517],{"class":693},[679,2973,1635],{"class":689},[679,2975,2976,2979,2981,2983,2985,2987],{"class":681,"line":813},[679,2977,2978],{"class":1061},"    svc",[679,2980,1194],{"class":689},[679,2982,2937],{"class":693},[679,2984,1050],{"class":689},[679,2986,926],{"class":693},[679,2988,1635],{"class":689},[679,2990,2991,2994,2996,2999,3001,3004,3007],{"class":681,"line":819},[679,2992,2993],{"class":1061},"    payload",[679,2995,1194],{"class":689},[679,2997,2998],{"class":693}," JSON",[679,3000,1050],{"class":689},[679,3002,3003],{"class":737},"stringify",[679,3005,3006],{"class":693},"(event)",[679,3008,1635],{"class":689},[679,3010,3011,3014,3016],{"class":681,"line":825},[679,3012,3013],{"class":689},"  }",[679,3015,1036],{"class":693},[679,3017,1635],{"class":689},[679,3019,3020,3022],{"class":681,"line":831},[679,3021,1081],{"class":689},[679,3023,885],{"class":693},[583,3025,3026,3027,3029],{},"Keys must match your column names, because ClickHouse rejects a ",[595,3028,597],{}," insert containing unknown columns.",[662,3031,3033],{"id":3032},"batching","Batching",[583,3035,3036],{},"Pair with a pipeline to insert in larger batches:",[669,3038,3040],{"className":671,"code":3039,"filename":2083,"language":674,"meta":675,"style":675},"import { createDrainPipeline } from 'evlog\u002Fpipeline'\nimport { createClickHouseDrain } from 'evlog\u002Fclickhouse'\nimport type { DrainContext } from 'evlog'\n\nconst pipeline = createDrainPipeline\u003CDrainContext>({\n  batch: { size: 500, intervalMs: 5000 },\n})\n\nexport default defineNitroPlugin((nitroApp) => {\n  nitroApp.hooks.hook('evlog:drain', pipeline(createClickHouseDrain()))\n})\n",[595,3041,3042,3061,3079,3101,3105,3129,3158,3164,3168,3188,3220],{"__ignoreMap":675},[679,3043,3044,3046,3048,3051,3053,3055,3057,3059],{"class":681,"line":682},[679,3045,686],{"class":685},[679,3047,690],{"class":689},[679,3049,3050],{"class":693}," createDrainPipeline",[679,3052,697],{"class":689},[679,3054,700],{"class":685},[679,3056,703],{"class":689},[679,3058,2485],{"class":706},[679,3060,710],{"class":689},[679,3062,3063,3065,3067,3069,3071,3073,3075,3077],{"class":681,"line":750},[679,3064,686],{"class":685},[679,3066,690],{"class":689},[679,3068,694],{"class":693},[679,3070,697],{"class":689},[679,3072,700],{"class":685},[679,3074,703],{"class":689},[679,3076,707],{"class":706},[679,3078,710],{"class":689},[679,3080,3081,3083,3086,3088,3091,3093,3095,3097,3099],{"class":681,"line":756},[679,3082,686],{"class":685},[679,3084,3085],{"class":685}," type",[679,3087,690],{"class":689},[679,3089,3090],{"class":693}," DrainContext",[679,3092,697],{"class":689},[679,3094,700],{"class":685},[679,3096,703],{"class":689},[679,3098,1183],{"class":706},[679,3100,710],{"class":689},[679,3102,3103],{"class":681,"line":783},[679,3104,1013],{"emptyLinePlaceholder":1012},[679,3106,3107,3109,3112,3114,3116,3119,3122,3125,3127],{"class":681,"line":792},[679,3108,1155],{"class":759},[679,3110,3111],{"class":693}," pipeline ",[679,3113,894],{"class":689},[679,3115,3050],{"class":737},[679,3117,3118],{"class":689},"\u003C",[679,3120,3121],{"class":1651},"DrainContext",[679,3123,3124],{"class":689},">",[679,3126,1027],{"class":693},[679,3128,1600],{"class":689},[679,3130,3131,3134,3136,3138,3141,3143,3146,3148,3151,3153,3156],{"class":681,"line":801},[679,3132,3133],{"class":1061},"  batch",[679,3135,1194],{"class":689},[679,3137,690],{"class":689},[679,3139,3140],{"class":1061}," size",[679,3142,1194],{"class":689},[679,3144,3145],{"class":730}," 500",[679,3147,1071],{"class":689},[679,3149,3150],{"class":1061}," intervalMs",[679,3152,1194],{"class":689},[679,3154,3155],{"class":730}," 5000",[679,3157,1734],{"class":689},[679,3159,3160,3162],{"class":681,"line":807},[679,3161,1081],{"class":689},[679,3163,885],{"class":693},[679,3165,3166],{"class":681,"line":813},[679,3167,1013],{"emptyLinePlaceholder":1012},[679,3169,3170,3172,3174,3176,3178,3180,3182,3184,3186],{"class":681,"line":819},[679,3171,1018],{"class":685},[679,3173,1021],{"class":685},[679,3175,1024],{"class":737},[679,3177,1027],{"class":693},[679,3179,1027],{"class":689},[679,3181,1033],{"class":1032},[679,3183,1036],{"class":689},[679,3185,1039],{"class":759},[679,3187,1042],{"class":689},[679,3189,3190,3192,3194,3196,3198,3200,3202,3204,3206,3208,3210,3213,3215,3217],{"class":681,"line":825},[679,3191,1047],{"class":693},[679,3193,1050],{"class":689},[679,3195,1053],{"class":693},[679,3197,1050],{"class":689},[679,3199,1058],{"class":737},[679,3201,1027],{"class":1061},[679,3203,772],{"class":689},[679,3205,1066],{"class":706},[679,3207,772],{"class":689},[679,3209,1071],{"class":689},[679,3211,3212],{"class":737}," pipeline",[679,3214,1027],{"class":1061},[679,3216,2090],{"class":737},[679,3218,3219],{"class":1061},"()))\n",[679,3221,3222,3224],{"class":681,"line":831},[679,3223,1081],{"class":689},[679,3225,885],{"class":693},[662,3227,3229],{"id":3228},"troubleshooting","Troubleshooting",[583,3231,3232,2302,3237,3239,3240,3242,3243,3246],{},[603,3233,3234,1050],{},[595,3235,3236],{},"Missing endpoint",[595,3238,1791],{}," is unset and no ",[595,3241,1887],{}," was passed. The drain logs ",[595,3244,3245],{},"[evlog\u002Fclickhouse] Missing endpoint"," once and then does nothing, so requests are never blocked or failed.",[583,3248,3249,3254,3255,2298,3257,3259,3260,2298,3262,3264,3265,1050],{},[603,3250,3251,1050],{},[595,3252,3253],{},"ClickHouse API error: 401"," Check ",[595,3256,1808],{},[595,3258,1824],{},". Credentials are sent as ",[595,3261,2297],{},[595,3263,2301],{}," headers, never in the query string, so they never reach ",[595,3266,2309],{},[583,3268,3269,3275,3276,3278],{},[603,3270,3271,3274],{},[595,3272,3273],{},"ClickHouse API error: 400"," mentioning unknown column."," Your table does not match the row shape. Either create the table from the DDL above, or supply a ",[595,3277,2013],{}," matching your columns.",[583,3280,3281,3286,3287,3289,3290,3293],{},[603,3282,3283,1050],{},[595,3284,3285],{},"Cannot parse input"," The table exists but a column type disagrees. ",[595,3288,2748],{}," is ",[595,3291,3292],{},"Nullable(UInt16)"," because it is absent on non-HTTP events.",[662,3295,3297],{"id":3296},"direct-api-usage","Direct API usage",[669,3299,3302],{"className":671,"code":3300,"filename":3301,"language":674,"meta":675,"style":675},"import { sendBatchToClickHouse, sendToClickHouse } from 'evlog\u002Fclickhouse'\n\nawait sendToClickHouse(event, { endpoint: 'http:\u002F\u002Flocalhost:8123' })\nawait sendBatchToClickHouse(events, { endpoint: 'http:\u002F\u002Flocalhost:8123' })\n","scripts\u002Fbackfill.ts",[595,3303,3304,3328,3332,3359],{"__ignoreMap":675},[679,3305,3306,3308,3310,3313,3315,3318,3320,3322,3324,3326],{"class":681,"line":682},[679,3307,686],{"class":685},[679,3309,690],{"class":689},[679,3311,3312],{"class":693}," sendBatchToClickHouse",[679,3314,1071],{"class":689},[679,3316,3317],{"class":693}," sendToClickHouse",[679,3319,697],{"class":689},[679,3321,700],{"class":685},[679,3323,703],{"class":689},[679,3325,707],{"class":706},[679,3327,710],{"class":689},[679,3329,3330],{"class":681,"line":750},[679,3331,1013],{"emptyLinePlaceholder":1012},[679,3333,3334,3336,3338,3341,3343,3345,3347,3349,3351,3353,3355,3357],{"class":681,"line":756},[679,3335,1388],{"class":685},[679,3337,3317],{"class":737},[679,3339,3340],{"class":693},"(event",[679,3342,1071],{"class":689},[679,3344,690],{"class":689},[679,3346,2097],{"class":1061},[679,3348,1194],{"class":689},[679,3350,703],{"class":689},[679,3352,643],{"class":706},[679,3354,772],{"class":689},[679,3356,697],{"class":689},[679,3358,885],{"class":693},[679,3360,3361,3363,3365,3368,3370,3372,3374,3376,3378,3380,3382,3384],{"class":681,"line":783},[679,3362,1388],{"class":685},[679,3364,3312],{"class":737},[679,3366,3367],{"class":693},"(events",[679,3369,1071],{"class":689},[679,3371,690],{"class":689},[679,3373,2097],{"class":1061},[679,3375,1194],{"class":689},[679,3377,703],{"class":689},[679,3379,643],{"class":706},[679,3381,772],{"class":689},[679,3383,697],{"class":689},[679,3385,885],{"class":693},[583,3387,3388,769,3391,3394,3395,3398],{},[595,3389,3390],{},"toClickHouseRow()",[595,3392,3393],{},"toJSONEachRow()",", and ",[595,3396,3397],{},"resolveClickHouseUrl()"," are also exported.",[662,3400,3402],{"id":3401},"next-steps","Next steps",[3404,3405,3406,3411,3416,3422],"ul",{},[623,3407,3408,3410],{},[587,3409,66],{"href":67},": control volume before it reaches ClickHouse",[623,3412,3413,3415],{},[587,3414,440],{"href":441},": add derived fields to every event",[623,3417,3418,3421],{},[587,3419,3420],{"href":509},"Pipeline",": batching, retries, and fan-out",[623,3423,3424,3427],{},[587,3425,3426],{"href":153},"Adapters Overview",": all available destinations",[3429,3430,3431],"style",{},"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}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki 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.sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}",{"title":675,"searchDepth":750,"depth":750,"links":3433},[3434,3435,3436,3437,3441,3445,3446,3447,3448,3449,3450,3451,3452],{"id":664,"depth":750,"text":20},{"id":713,"depth":750,"text":714},{"id":974,"depth":750,"text":25},{"id":1756,"depth":750,"text":521,"children":3438},[3439,3440],{"id":1760,"depth":756,"text":1761},{"id":1861,"depth":756,"text":346},{"id":2068,"depth":750,"text":2069,"children":3442},[3443,3444],{"id":2075,"depth":756,"text":2076},{"id":2167,"depth":756,"text":2168},{"id":2313,"depth":750,"text":2314},{"id":2446,"depth":750,"text":2447},{"id":2488,"depth":750,"text":2489},{"id":2869,"depth":750,"text":2870},{"id":3032,"depth":750,"text":3033},{"id":3228,"depth":750,"text":3229},{"id":3296,"depth":750,"text":3297},{"id":3401,"depth":750,"text":3402},"Insert wide events into ClickHouse over the HTTP interface — typed columns for what you aggregate, full JSON for everything else.","md",[3456,3462],{"label":3457,"icon":3458,"to":589,"target":3459,"color":3460,"variant":3461},"HTTP Interface","i-lucide-external-link","_blank","neutral","subtle",{"label":3463,"icon":3458,"to":2453,"target":3459,"color":3460,"variant":3461},"Async Inserts",{},{"title":196,"icon":199},{"title":578,"description":3453},"2tkkGzm_QM70LI_vpY_UpJWCHtZzf2R9tvxSFL45XwM",[3469,3471],{"title":191,"path":192,"stem":193,"description":3470,"icon":194,"children":-1},"Push wide events to Grafana Loki — self-hosted, multi-tenant, or Grafana Cloud — with low-cardinality labels and full JSON querying.",{"title":201,"path":202,"stem":203,"description":3472,"icon":204,"children":-1},"Send logs via OpenTelemetry Protocol (OTLP) to Grafana, Datadog, Honeycomb, and any compatible backend. Supports gRPC and HTTP transports.",1789915920912]