new-migration

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Create a new Fleet database migration with timestamp naming, Up function, init registration, and test file.

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Source SKILL.md: https://github.com/fleetdm/fleet/blob/HEAD/.claude/skills/new-migration/SKILL.md

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Create a New Database Migration

Create a migration for: $ARGUMENTS

Process

1. Generate Timestamp and Name

Use make migration name=CamelCaseName if available, or generate manually:

date +%Y%m%d%H%M%S

The migration name should be descriptive CamelCase (e.g., AddRecoveryLockAutoRotateAt, CreateTableSoftwareInstallers).

2. Create Migration File

Location: server/datastore/mysql/migrations/tables/{TIMESTAMP}_{Name}.go

package tables

import "database/sql"

func init() {
	MigrationClient.AddMigration(Up_{TIMESTAMP}, Down_{TIMESTAMP})
}

func Up_{TIMESTAMP}(tx *sql.Tx) error {
	_, err := tx.Exec(`
		-- SQL statement here
	`)
	return err
}

func Down_{TIMESTAMP}(tx *sql.Tx) error {
	return nil
}

3. Create Test File

Location: server/datastore/mysql/migrations/tables/{TIMESTAMP}_{Name}_test.go

package tables

import (
	"testing"

	"github.com/stretchr/testify/require"
)

func TestUp_{TIMESTAMP}(t *testing.T) {
	db := applyUpToPrev(t)

	// Set up test data before migration if needed

	applyNext(t, db)

	// Verify migration applied correctly
	// e.g., check table exists, columns added, data migrated
}

4. Verify

Run go build ./server/datastore/mysql/migrations/... to check compilation
Run MYSQL_TEST=1 go test -run TestUp_{TIMESTAMP} ./server/datastore/mysql/migrations/tables/ to test the migration

Rules

Every migration MUST have a test file
Down migrations are always no-ops (return nil) — Fleet doesn't use rollback migrations
Never modify existing migration files — create new ones
Data migrations go in the data/ subdirectory