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langfuse-migration-deep-dive Execute complex Langfuse migrations including data migration and platform changes.
Use when migrating from other observability platforms, moving between Langfuse instances,
or performing major infrastructure migrations.
Trigger with phrases like "langfuse migration", "migrate to langfuse",
"langfuse data migration", "langfuse platform migration", "switch to langfuse".
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name langfuse-migration-deep-dive description Execute complex Langfuse migrations including data migration and platform changes.
Use when migrating from other observability platforms, moving between Langfuse instances,
or performing major infrastructure migrations.
Trigger with phrases like "langfuse migration", "migrate to langfuse",
"langfuse data migration", "langfuse platform migration", "switch to langfuse".
allowed-tools Read, Write, Edit, Bash(npm:*) version 1.12.0 license MIT author Jeremy Longshore <jeremy@intentsolutions.io> tags ["saas","langfuse","observability","migration"] compatibility Designed for Claude Code, also compatible with Codex and OpenClaw
Langfuse Migration Deep Dive
Current State
!npm list langfuse @langfuse/client 2>/dev/null | head -5 || echo 'No langfuse packages'
Overview
Comprehensive guide for complex migrations: cloud-to-self-hosted, LangSmith-to-Langfuse, cross-instance data migration, and zero-downtime dual-write patterns.
Prerequisites
Understanding of source and target Langfuse instances
API keys for both source and target
Git branch for migration work
Rollback plan documented
Migration Scenarios
Scenario Complexity Downtime Data Loss Risk Cloud to Cloud (different project) Low None None Cloud to Self-hosted Medium Minutes Low Self-hosted to Cloud Medium Minutes Low LangSmith to Langfuse High Hours Medium SDK v3 to v4+ (no data migration) Low None None
Instructions
Step 1: Export Data from Source Instance
import { LangfuseClient } from "@langfuse/client" ;
import { writeFileSync, mkdirSync } from "fs" ;
const source = new LangfuseClient ({
publicKey : process.env .SOURCE_LANGFUSE_PUBLIC_KEY ,
secretKey : process.env .SOURCE_LANGFUSE_SECRET_KEY ,
baseUrl : process.env .SOURCE_LANGFUSE_BASE_URL ,
});
async function exportAll
outputDir : string
mkdirSync
recursive
true
let
1
let
allTraces
any
let
true
console
log
"Exporting traces..."
while
const
await
api
traces
list
limit
100
push
data
data
length
100
await
new
Promise
(r ) =>
setTimeout
200
writeFileSync
`${outputDir} /traces.json`
JSON
stringify
null
2
console
log
` Exported ${allTraces.length} traces`
1
let
allScores
any
true
console
log
"Exporting scores..."
while
const
await
api
scores
list
limit
100
push
data
data
length
100
await
new
Promise
(r ) =>
setTimeout
200
writeFileSync
`${outputDir} /scores.json`
JSON
stringify
null
2
console
log
` Exported ${allScores.length} scores`
console
log
"Exporting prompts..."
const
await
api
prompts
list
limit
100
writeFileSync
`${outputDir} /prompts.json`
JSON
stringify
data
null
2
console
log
` Exported ${prompts.data.length} prompts`
console
log
"Exporting datasets..."
const
await
api
datasets
list
limit
100
const
for
const
of
data
const
await
api
datasetItems
list
datasetName
name
limit
1000
push
items
data
await
new
Promise
(r ) =>
setTimeout
200
writeFileSync
`${outputDir} /datasets.json`
JSON
stringify
null
2
console
log
` Exported ${fullDatasets.length} datasets`
exportAll
"./migration-export"
Step 2: Import Data to Target Instance
import { LangfuseClient } from "@langfuse/client" ;
import { readFileSync } from "fs" ;
const target = new LangfuseClient ({
publicKey : process.env .TARGET_LANGFUSE_PUBLIC_KEY ,
secretKey : process.env .TARGET_LANGFUSE_SECRET_KEY ,
baseUrl : process.env .TARGET_LANGFUSE_BASE_URL ,
});
async function importAll (inputDir : string console .log ("Importing prompts..." );
const prompts = JSON .parse (readFileSync (`${inputDir} /prompts.json` , "utf-8" ));
for (const prompt of prompts) {
await target.api .prompts .create ({
name : prompt.name ,
prompt : prompt.prompt ,
type : prompt.type ,
config : prompt.config ,
labels : prompt.labels ,
});
console .log (` Imported prompt: ${prompt.name} ` );
await new Promise ((r ) => setTimeout (r, 100 ));
}
console .log ("Importing datasets..." );
const datasets = JSON .parse (readFileSync (`${inputDir} /datasets.json` , "utf-8" ));
for (const ds of datasets) {
await target.api .datasets .create ({
name : ds.name ,
description : ds.description ,
metadata : { ...ds.metadata , migratedFrom : "source-instance" },
});
for (const item of ds.items || []) {
await target.api .datasetItems .create ({
datasetName : ds.name ,
input : item.input ,
expectedOutput : item.expectedOutput ,
metadata : item.metadata ,
});
await new Promise ((r ) => setTimeout (r, 50 ));
}
console .log (` Imported dataset: ${ds.name} (${ds.items?.length || 0 } items)` );
}
console .log ("Import complete." );
console .log ("Note: Traces and scores are historical -- they reference old trace IDs." );
console .log ("New traces will be created by your application pointing to the target." );
}
importAll ("./migration-export" );
Step 3: Dual-Write for Zero-Downtime Migration Write traces to both instances during transition:
import { LangfuseSpanProcessor } from "@langfuse/otel" ;
import { NodeSDK } from "@opentelemetry/sdk-node" ;
const sourceProcessor = new LangfuseSpanProcessor ({
publicKey : process.env .SOURCE_LANGFUSE_PUBLIC_KEY ,
secretKey : process.env .SOURCE_LANGFUSE_SECRET_KEY ,
baseUrl : process.env .SOURCE_LANGFUSE_BASE_URL ,
});
const targetProcessor = new LangfuseSpanProcessor ({
publicKey : process.env .TARGET_LANGFUSE_PUBLIC_KEY ,
secretKey : process.env .TARGET_LANGFUSE_SECRET_KEY ,
baseUrl : process.env .TARGET_LANGFUSE_BASE_URL ,
});
const sdk = new NodeSDK ({
spanProcessors : [sourceProcessor, targetProcessor],
});
sdk.start ();
Step 4: Validate Migration
import { LangfuseClient } from "@langfuse/client" ;
const source = new LangfuseClient ({
publicKey : process.env .SOURCE_LANGFUSE_PUBLIC_KEY ,
secretKey : process.env .SOURCE_LANGFUSE_SECRET_KEY ,
baseUrl : process.env .SOURCE_LANGFUSE_BASE_URL ,
});
const target = new LangfuseClient ({
publicKey : process.env .TARGET_LANGFUSE_PUBLIC_KEY ,
secretKey : process.env .TARGET_LANGFUSE_SECRET_KEY ,
baseUrl : process.env .TARGET_LANGFUSE_BASE_URL ,
});
async function validate (const sourcePrompts = await source.api .prompts .list ({ limit : 100 });
const targetPrompts = await target.api .prompts .list ({ limit : 100 });
console .log (`Prompts: source=${sourcePrompts.data.length} , target=${targetPrompts.data.length} ` );
const sourceDatasets = await source.api .datasets .list ({ limit : 100 });
const targetDatasets = await target.api .datasets .list ({ limit : 100 });
console .log (`Datasets: source=${sourceDatasets.data.length} , target=${targetDatasets.data.length} ` );
const since = new Date (Date .now () - 3600000 ).toISOString ();
const sourceTraces = await source.api .traces .list ({ fromTimestamp : since, limit : 100 });
const targetTraces = await target.api .traces .list ({ fromTimestamp : since, limit : 100 });
console .log (`Recent traces (1h): source=${sourceTraces.data.length} , target=${targetTraces.data.length} ` );
const variance = Math .abs (sourceTraces.data .length - targetTraces.data .length ) / Math .max (sourceTraces.data .length , 1 );
console .log (`Trace variance: ${(variance * 100 ).toFixed(1 )} % (target: <5%)` );
}
validate ();
Step 5: Cutover and Cleanup
const sdk = new NodeSDK ({
spanProcessors : [targetProcessor],
});
Rollback Plan set -euo pipefail
export LANGFUSE_PUBLIC_KEY="pk-lf-source-..."
export LANGFUSE_SECRET_KEY="sk-lf-source-..."
export LANGFUSE_BASE_URL="https://source.langfuse.com"
Error Handling Issue Cause Solution Export timeout Too much data Paginate with smaller page sizes Import duplicates Re-running import Use idempotent creates with unique names Dual-write divergence One instance failing Monitor both, alert on variance > 5% Missing prompts Not exported Export prompts before datasets
Resources 