SegmentStream layers cross-channel attribution and budget optimization on top of PostHog — reading raw event data exported by PostHog Batch Exports into your data warehouse, not the PostHog reporting interface.
PostHog exports raw event data into your own data warehouse via Batch Exports. Once that export is configured, point SegmentStream at the same warehouse and SegmentStream reads the events from there.
PostHog Batch Exports support BigQuery, Snowflake, Redshift, Databricks, Postgres, Amazon S3, and Azure Blob Storage. SegmentStream connects to whichever one you use.
SegmentStream does not use PostHog's query / reporting API. That API exposes only processed data with PostHog's own session and identity model. SegmentStream consumes the raw exported events and builds attribution using its own identity graph and algorithms.
PostHog Batch Exports run forward from when they're configured. Historical coverage and retention depend on your PostHog plan and instance — see the Batch Exports documentation for limits.