The nine Capture tables (files, jobs, folders, shares, links, quota, cookies, profiles, library
resume points) leave app/models.py for the unit's own module; app.tables registers every unit's
tables for the migrations, the test database and the ownership check. No schema change.
The fence is switched on unit by unit: each route file's database work (SQL built, session data
calls, model attributes set, unit tables imported) is pinned at today's count and may only shrink.
A core route may not reach into a unit's tables. Every model has an owner.
peter