What if perfect data isn’t realistic — and that’s okay? Peter showed how even “safe” Rails code can persist impossible records, from race conditions to forgotten migrations. His open-source gem Recheck treats data queries like tests, helping you detect invalid rows in production — before users notice.

When thousands of per-tenant schemas became a scaling nightmare, Prarthana’s team at NexHealth rebuilt their healthtech DB around row-based multitenancy using UUIDs. The transition? Like changing a wing on a flying aircraft.