database · inferred from evidence
ClickHouse
A column-oriented DBMS used for storing and querying log metadata in this context.
- UI errors loading traces after Langfuse upgrade: corrupted ClickHouse parts
After upgrading the self-hosted Langfuse docker image, the UI throws internal errors loading traces and traces are unreachable: logs show ClickHouse `Stream String.size for column project_id/trace_id with type String is not found` and `Ther
- Upgrading to SigNoz 0.57.0 broke log-based value widgets (report 0)
After upgrading SigNoz from 0.56.0 to 0.57.0, existing log-based value widgets on dashboards report 0, while recreating the identical widget shows correct numbers. Removing all where conditions makes the old widget work; re-adding them fixe
- Langfuse docker compose fails on ARM: wrong-arch migrate binary, syntax error on ClickHouse migrations
Self-hosting Langfuse v3 via docker compose on an ARM64 Linux machine: the langfuse-web container crash-loops on ClickHouse migrations with `/usr/bin/migrate: line 1: syntax error: unexpected ")"` and `Applying clickhouse migrations failed`
- ClickHouse 23.8: steady memory growth after upgrade from 23.1 (Kafka statistics leak)
After upgrading ClickHouse from 23.1 to 23.8.x, memory usage grows steadily. Queries that used ~500 MB now use 2+ GB, and RSS climbs until a restart. The cause is a memory leak in the new Kafka consumer statistics functionality introduced i