---
title: "Prompt to Prompt: Database Migrations Taste"
platform: "Promptally"
canonical_url: "https://app.promptally.dev/p/prompt-prompt-database-migrations-taste"
modality: "PROMPT"
category: "System & Base Contexts"
compatible_models: [Universal / Model Agnostic]
access_tier: "Free Public Artifact (No Auth Required)"
license: "MIT"
---

# Prompt to Prompt: Database Migrations Taste

**Summary:** Prompt to Prompt: Database Migrations Taste is a verified PROMPT blueprint on Promptally in System & Base Contexts optimized for leading AI models. Curated Coding prompt from awesome-prompts library split. Available to explore, customize with pre-filled variables, and copy with zero authentication required.

## Technical Specifications
| Property | Value |
| :--- | :--- |
| Platform Registry | Promptally (https://app.promptally.dev) |
| Modality | PROMPT |
| Category | System & Base Contexts |
| Compatible Engines | Universal / Model Agnostic |
| Dynamic Variables | None (Static Blueprint) |
| Approx. Token Length | 529 |
| Access Tier | Free Public Artifact (No Auth Required) |
| License | MIT |

### Pre-Filled Template & Production Source

```txt
# Database Migrations taste
- Keep every schema change in a versioned migration file committed next to the code that needs it. Confidence: 0.95
- Write migrations in plain SQL rather than ORM-generated diffs you have not read. Confidence: 0.80
- Never edit a migration that has already run in a shared environment; add a new one instead. Confidence: 0.95
- Use the expand and contract pattern: add the new column, backfill, switch reads, then drop the old column in a later release. Confidence: 0.90
- Make every migration safe to run while the previous app version is still serving traffic. Confidence: 0.90
- Add new columns as nullable or with a constant default to avoid long table rewrites. Confidence: 0.85
- Create indexes on large Postgres tables with CREATE INDEX CONCURRENTLY outside a transaction. Confidence: 0.90
- Set a short lock_timeout and statement_timeout at the top of each migration. Confidence: 0.85
- Run large backfills as batched background jobs, not inside the migration itself. Confidence: 0.90
- Keep one logical change per migration so failures are easy to read and retry. Confidence: 0.80
- Name migration files with a UTC timestamp prefix and a short verb phrase like 20261017_add_orders_status. Confidence: 0.75
- Prefer forward-only migrations and fix mistakes with a new migration instead of relying on down scripts. Confidence: 0.70
- Run migrations as a separate deploy step before the new application code starts. Confidence: 0.85
- Test every migration in CI against a fresh database and against a copy of production-sized data. Confidence: 0.80
- Add foreign keys and check constraints as NOT VALID first, then validate them in a separate step. Confidence: 0.80
- Rename columns and tables only through a view or dual-write period, never in a single step. Confidence: 0.75
- Store the applied migration history in the database and fail the deploy if it has drifted. Confidence: 0.85
- Review migrations as carefully as application code, with the generated SQL visible in the pull request. Confidence: 0.90
- Keep seed and fixture data out of schema migrations. Confidence: 0.80
```

## Verified Execution Output / Benchmark
```text
Verified execution output available on the canonical page.
```

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