drizzle-migrations

Database migration guidelines for Drizzle, a TypeScript tool that turns schema changes into files for updating a database.

In plain words
What is it for?
Use them when changing schemas in `db/schema/`, generating migrations with `npm run generate`, reviewing them, applying them with `npm run migrate`, and committing them.
Why use it?
They prevent inconsistent or manually edited migration files and keep database changes tied to the application code.

Cursor rule

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/squirrelogic/cursor-rules/drizzle-migrations
Clone the repo
git clone --depth 1 https://github.com/squirrelogic/cursor-rules
Per session 352 This file is loaded in full into every session.
When invoked 352 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00352 $0.00352
Opus 5 $0.00176 $0.00176
Sonnet 5 $0.00070 $0.00070
Haiku 4.5 $0.00035 $0.00035

Measured 2d ago against content hash 768a46ff1736, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

drizzle-migrations scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

supabase/drizzle-migrations.mdc · 46 lines

What it actually says

Drizzle Migration Guidelines

Migration Generation

  • ALWAYS use npm run generate to create migrations
    • Never create migration files manually
    • This ensures consistent migration file naming and structure
    • Drizzle-kit will automatically detect schema changes
    • Example: npm run generate will execute drizzle-kit generate command

Migration Best Practices

  • Review Generated Migrations

    -- ✅ DO: Review and verify generated migrations
    ALTER TABLE "customers" ADD COLUMN "status" text DEFAULT 'new_customer';
    
    -- ❌ DON'T: Manually modify generated migration files
    -- Let drizzle-kit handle the migration generation
    
  • Version Control

    • Commit migration files along with schema changes
    • Never modify committed migrations
    • Create new migrations for additional changes

Migration Commands

  • npm run generate - Generate new migrations
  • npm run migrate - Apply pending migrations
  • npm run studio - Open Drizzle Studio for database inspection

Migration Workflow

  1. Make changes to schema files in db/schema/
  2. Run npm run generate to create migration
  3. Review generated migration file
  4. Run npm run migrate to apply changes
  5. Commit both schema and migration files

References

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 46 lines · 352 tokens per session scan A 768a46ff1736

Subscribe to this mod's changes

drizzle-migrations is a cursor rule published in the GitHub repository squirrelogic/cursor-rules (20 stars, last pushed 1y ago), licensed MIT. It adds 352 tokens to every session, about $0.0018 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.