bump-migration - SKILL.md Agent Skill

name: bump-migration description: Bump a database migration's timestamp to the current time. Required when a PR's migration is older than one already merged to main. Use when asked to "bump migration", "update migration timestamp", or when a migration ordering conflict is detected. allowed-tools: Bash(go run ), Bash(make dump-test-schema), Bash(git diff), Bash(ls ), Read, Grep, Glob model: sonnet effort: medium

Bump a database migration timestamp

Bump the migration: $ARGUMENTS

When to use

This is required when a PR has a database migration with a timestamp older than a migration already merged to main. This happens when a PR has been pending merge for a while and another PR got merged with a more recent migration.

Process

1. Identify the migration to bump

If the user provided a filename, use that. Otherwise, find migrations on this branch that are older than the latest on main:

# List migrations on this branch that aren't on main
git diff origin/main --name-only -- server/datastore/mysql/migrations/tables/

2. Run the bump tool

The tool lives at tools/bump-migration/main.go. Run it from the repo root:

go run tools/bump-migration/main.go --source-migration YYYYMMDDHHMMSS_MigrationName.go

This will:

Rename the migration file with a new current timestamp
Rename the test file (if it exists)
Update all function names inside both files (Up_OLDTS → Up_NEWTS, Down_OLDTS → Down_NEWTS, TestUp_OLDTS → TestUp_NEWTS)

3. Optionally regenerate the schema

If the migration affects the schema, add --regen-schema to also run make dump-test-schema:

go run tools/bump-migration/main.go --source-migration YYYYMMDDHHMMSS_MigrationName.go --regen-schema

4. Verify

Check that the old files are gone and new files exist with the updated timestamp
Verify the function names inside the files match the new timestamp
Run go build ./server/datastore/mysql/migrations/... to check compilation

Rules

Always run from the repo root
Provide the migration filename, not the test filename
The tool handles both the migration and its test file automatically