# Domain Model

Entities:

- **Accounts**: companies/organizations.
- **Contacts**: people linked to accounts or standalone.
- **Pipelines & Stages**: sales flow definitions.
- **Deals**: opportunities tied to pipelines/stages.
- **Activities**: tasks/calls/meetings with assignments.
- **Notes**: free-form notes attached to entities.
- **Tags**: label entities with unique names per tenant.

All entities include `tenant_id`, `created_at`, and `updated_at` for auditability.