Data model

Migrations: services/control-plane/migrations/ (0001–0012).

Tables

Table	Note
`tenants`	+ slug
`principals`	roles: admin, engineer, viewer, operator
`principal_avatars`
`sessions`
`api_tokens`	+ role_max
`principal_folder_grants`
`projects`
`workspaces`
`revisions`	immutable
`revision_resources`	immutable
`workspace_resources`	draft
`deployment_targets`	+ runtime_id
`deployment_artifacts`	immutable
`audit_events`	immutable
`idempotency_keys`
`runtimes`	registered runtime endpoints

folder, tag, screen, equipmentType, equipment, udt, udtInstance, connection, report

historian_samples — CREATE TABLE IF NOT EXISTS when crates/historian-postgres connects. Not the engineering DB.