4e8e5069fa
- Added: api-patterns, app-builder, architecture, bash-linux, behavioral-modes, clean-code, code-review-checklist, database-design, deployment-procedures, docker-expert, documentation-templates, game-development, geo-fundamentals, i18n-localization, lint-and-validate, mobile-design, nestjs-expert, nextjs-best-practices, nodejs-best-practices, parallel-agents, performance-profiling, plan-writing, powershell-windows, prisma-expert, python-patterns, react-patterns, red-team-tactics, seo-fundamentals, server-management, tailwind-patterns, tdd-workflow, typescript-expert, vulnerability-scanner - Updated README: skill count 179 → 223 - Added credit for vudovn/antigravity-kit (MIT License) Source: https://github.com/vudovn/antigravity-kit
49 lines
1.1 KiB
Markdown
49 lines
1.1 KiB
Markdown
# Migration Principles
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> Safe migration strategy for zero-downtime changes.
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## Safe Migration Strategy
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```
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For zero-downtime changes:
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│
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├── Adding column
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│ └── Add as nullable → backfill → add NOT NULL
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│
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├── Removing column
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│ └── Stop using → deploy → remove column
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│
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├── Adding index
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│ └── CREATE INDEX CONCURRENTLY (non-blocking)
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│
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└── Renaming column
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└── Add new → migrate data → deploy → drop old
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```
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## Migration Philosophy
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- Never make breaking changes in one step
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- Test migrations on data copy first
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- Have rollback plan
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- Run in transaction when possible
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## Serverless Databases
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### Neon (Serverless PostgreSQL)
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| Feature | Benefit |
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|---------|---------|
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| Scale to zero | Cost savings |
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| Instant branching | Dev/preview |
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| Full PostgreSQL | Compatibility |
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| Autoscaling | Traffic handling |
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### Turso (Edge SQLite)
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| Feature | Benefit |
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|---------|---------|
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| Edge locations | Ultra-low latency |
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| SQLite compatible | Simple |
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| Generous free tier | Cost |
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| Global distribution | Performance |
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