Diagnosing failed data warehouse syncs Work top-down when a data warehouse source or table is failing, stuck, or producing bad data: source → schema → recovery action. Do not jump straight to "resync from scratch" — that discards synced data and restarts from zero, which is rarely the right first step. When to use this skill - The user reports a specific sync is failing (e.g. "my Stripe source is red") - A table has been in state far longer than expected - Data in a warehouse table is stale, missing rows, or looks corrupt - Latest rows aren't appearing despite the schema being marked - The us…