supabase-cli/docs/supabase/migration/new.md

supabase-migration-new

Creates a new migration file locally.

A supabase/migrations directory will be created if it does not already exists in your current workdir. All schema migration files must be created in this directory following the pattern <timestamp>_<name>.sql.

Outputs from other commands like db diff may be piped to migration new <name> via stdin.