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After reviewing 14 AI SaaS MVPs built with tools like Lovable, Bolt, and Cursor, the author identifies five common production failures: untested RLS policies, broken auth refresh flows, background jobs sharing the same connection pool, poorly designed schemas, and missing idempotency for payments/APIs. The fix is 2-3 weeks of targeted infrastructure work.
The article discusses the complexities of implementing idempotency in APIs, arguing that handling edge cases like concurrent requests and content mismatches is harder than simple replay caching.