Langfuse upgrades

Planning major self-hosted Langfuse upgrades, which change infrastructure and data models, and staying within supported SDK and security patch windows.

Langfuse v3 to v4 upgrade

Planning the self-hosted Langfuse v4 upgrade: infrastructure minimums, finishing v3 background migrations, choosing the legacy or dual write mode, migrating SDKs and evaluators, backfilling history and cutting over.

Langfuse v2 to v3 upgrade

Moving a Postgres-only Langfuse v2 deployment to the v3 architecture with ClickHouse, Redis and blob storage: the zero-downtime parallel approach, the version window that works, and background data migrations.

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