Do I need a warehouse at $10K/month revenue?
Probably not. Below about $1M ARR, most founders get by with well-queried production databases and platform-specific analytics (PostHog, Stripe dashboards, GA4). The AI Data Engineer can help either way — for smaller companies it tightens the existing queries and builds lightweight mart tables in Postgres; for larger companies it moves you to a proper warehouse (BigQuery is usually cheapest to start). The rule of thumb: when analytical queries are slowing your app's production DB or when you need to join 3+ sources regularly, it's time.