Zero-Downtime Migrations: Keeping the Engine Running
SPRINT_01 [DEPLOY]: Database migrations applied. Zero downtime. If updating your schema forces you to put up a "maintenance mode" banner, your deployment strategy is obsolete. Here is how to orchestrate seamless database and API updates.
The Fear of Live Schema Changes
High-traffic systems cannot afford maintenance windows. Clients notice and trust erodes.
The Expand/Contract Pattern
Add column → dual write → backfill → read new → drop old. Complete step-by-step with code.
Alembic and FastAPI
Programmatic migration management that integrates perfectly with the fast-cycle deploy pipeline.
Coolify Deployment Strategies
Traffic routing during container rebuilds prevents 502s. Blue-green and rolling update patterns.
Deployments become boring, predictable events rather than high-stress emergencies.
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Zero-Downtime Migrations: Keeping the Engine Running
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