Deployment / Production-Only Problems

Application works locally but fails immediately in production

Production environment variable is missing despite being configured

Production API returns different data than local API

Static files disappear after deployment

Application works after deployment then fails after restart

Production database connection fails while manual connection works

Background jobs run locally but never execute in production

Production timezone causes scheduled jobs to run at wrong time

Application crashes only under real user traffic

Deployment succeeds but browser still shows previous version