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Get Started Free →langfuse/seed-test-data
Seed reproducible local Langfuse data in ClickHouse and Postgres.
Passed 17 of 19 test cases with the skill, and 4 of 19 without it.
and 19 more in the full report
17 fixed4 passed either way1 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 14 test cases the skill fixed. Same model, same prompt, with and without the skill.
Before running our local benchmarks, I want to verify if my local setup services like Postgres, ClickHouse, and MinIO are healthy. Please run the seed preflight health diagnostic and share the status output listing any failures alongside their recommended repair steps.
| Checked | Without skill | With skill |
|---|---|---|
| Recommends executing pnpm run seed -- doctor | Missed | Passed |
The instructions your model reads when the skill loads.
One-shot deterministic test data for local Langfuse. The CLI handles env loading, preflight checks, ClickHouse/Postgres writes, readback verification, and prints UI deep links plus a machine-readable JSON summary (last stdout line).
pnpm run seed -- doctor
Prints PASS/WARN/FAIL per dependency (Postgres, migrations, project, ClickHouse, v4 dev tables, Redis, MinIO, web app) with the exact fix command for every failure. Do not debug Docker/ClickHouse manually before running this.
| I need... | Command |
|---|---|
| A very complex observation tree (v3) | pnpm run seed -- trace-tree --observations 5000 --depth 12 --breadth 500 |
| The same tree readable in the v4 events UI | add --v4 (writes events_full; events_core fills via MV) |
| Async parents whose subtree outlives their own span (subtree wall-clock duration badge) | add --async-parents to trace-tree (root + hub end immediately while children keep running) |
| A realistic agent flow over a timeline (graph view + scrubbable timeline) | pnpm run seed -- agent-timeline --turns 6 --v4 (LangGraph refine loop planner→retriever→generator→critic→loop, staggered in time; add --timing-only for the pure timing fallback) |
| A trace that is large as a GRAPH (many distinct node names + connections, the trace-graph layout stress) | pnpm run seed -- agent-graph --v4 (~1,350 distinct connections from 350 observations; --nodes 120 --steps 100 --parallel 8 crosses the layout ceiling, --nodes 80 --steps 30 --parallel 4 is small-but-dense) |
| A dozen SMALL traces, each a different timeline shape (the everyday case, not a stress test) | pnpm run seed -- timeline-shapes --v4 (12 hand-timed traces of 4-25 observations: rag answer, streamed chat with a TTFT split, 8-way fan-out, retry backoff with widening gaps, a 13-minute wait on a human, one slow tool dwarfing everything, an error cascade with failover, in-flight spans with no end time, zero-duration checkpoints, a ten-level ladder, 24 flat siblings, a three-turn agent loop with think time; --shape <slug> for one) |
| A row carrying every annotation at once, to judge whether the timeline is overloaded | pnpm run seed -- timeline-annotated --v4 (ONE trace, 12 observations: one/two/four scores — the last collapsing into +1 — one and twelve comments, a streaming first-token mark, costs and durations spread so the heat map paints some rows, plain rows beside them for contrast, and all three label placements on screen together) |
| A multi-HOUR agent run (wall clock dominated by waiting, as production ones are) | pnpm run seed -- agent-timeline --turns 120 --turn-gap-ms 60000 --v4 (~2.5h; the gap is jittered up to 2x, so the work lands at a few percent of the trace instead of packing every span into a few seconds) |
| A demo-grade, real-looking agent trace (videos, screenshots, docs) | pnpm run seed -- support-agent --v4 --id-prefix <hex> (one fixed, fully handcrafted support-copilot refund run: guardrails, parallel context fan-out, 3-turn ReAct loop with real payloads/costs; deterministic — reseed with a FRESH prefix for a clean take; the prefix is the trace id, so a hex prefix reads like production) |
| A plain trace with no agentic types (collapsed-by-default graph panel) | add --plain to trace-tree (SPAN/GENERATION/EVENT only) |
A trace with MORE observations than the detail view loads (v4 caps the tree at 10k, startTime ASC — the chronological tail is missing) | pnpm run seed -- trace-tree --observations 12000 --stride-ms 10 --v4 (--stride-ms starts each observation index × N ms in, so start times are unique and strictly increasing: observation index < 10000 loads, -obs-10000 and up fall past the cap. Without it thousands of rows share one millisecond and the boundary is arbitrary. Re-runs that CHANGE timing flags need a fresh --id-prefix: start_time is an events ORDER BY key, so both versions persist in the same trace) |
| An extremely DEEP single-chain trace (tree depth = observation count; layout stress) | pnpm run seed -- deep-chain --v4 (1401 sequential generations, each the sole child of the previous — the mis-parented-instrumentation shape from LFE-10959 that collapses tree/timeline layouts; --observations N to change depth) |
| A super tough session (v3 legacy session view) | pnpm run seed -- long-session --traces 300 --observations-per-trace 8 |
| Diverse v4 session shapes (chat / coding-agent / mixed / media) for the session-detail view | pnpm run seed -- session-shapes --shape all (the agent shape has I/O on AGENT/TOOL with no GENERATION — pre-LFE-10520 the "first generation" default rendered empty cards for it; the current "All observations with I/O" default renders it correctly; v4 on by default) |
| Many sessions for the sessions TABLE and its filters / search bar (not the detail view) | pnpm run seed -- session-variety --sessions 120 --days 14 (searchable topic ids, 1-3 userIds and 1-3 tags per session, four environments, session metadata tier/region/channel/topic, numeric + categorical + boolean session scores, comments on a quarter; v4 on by default. Widen the time-range picker past the default 1 day.) |
| Session messages carrying Langfuse media references (inline image, several refs in one message, bare refs in a content array, link-only payload) | pnpm run seed -- session-shapes --shape media — uploads the image/audio/pdf fixtures to MinIO and links them to the observation, so the inline chip and the "Media" strip both resolve (LFE-14815, LFE-9577) |
| Many traces for list/filter performance | pnpm run seed -- many-traces --count 100000 --days 14 |
| Long-window v4 traffic with cost/latency/token OUTLIERS (outlier chart strip, LFE-14451) | pnpm run seed -- outlier-traffic --days 90 (diurnal base load + deterministic spikes + hour-long ×8-latency incidents; root AGENT + GENERATION carrying cost + TOOL per trace; v4 on by default) |
test cases passed, vs 4 / 19 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.