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Build me one email system for both marketing and transactional mail.

STACK
- Postgres, a worker process, and Resend or SES for delivery

ONE CONTACT
- A single contacts table keyed on email, with properties as JSON and an array of tags
- Every send — campaign, sequence or transactional — writes to one messages table against that contact

EVENTS FROM THE APP
- POST /event {email, name, properties}
- Events are appended, never updated, and are what sequences read

SEQUENCES
- Steps: wait, send, branch on a property or a recent event, exit
- A scheduler pass every few minutes finds due steps; a contact can be in one sequence at a time

FREQUENCY, WHICH IS THE POINT
- A global rule: no more than N marketing emails per contact per week
- Transactional mail ignores that cap; marketing never does

TEMPLATES
- MJML compiled at build time, plain-text part always generated

Include the schema, the scheduler and a README on the frequency rule.