Phase 1: crawl the full channel with flat-playlist to store any videos not yet in DB (fast, no individual requests). Phase 2: fetch real view_count for up to 200 channel videos in parallel (8 workers), prioritising those missing a count. Popular tab sorts all channel videos by view_count DESC NULLS LAST. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>