Ask HN: What's your most pain point after switching from MySQL/PG to DynamoDB

Stumbled across Canva's post: From Zero to 50 Million Uploads per Day: Scaling Media at Canva, https://canvatechblog.com/from-zero-to-50-million-uploads-per-day-scaling-media-at-canva-c81fa0c92f34.

The article touches lightly on the pain points after switching. Would like to learn more.