- New model: minimum_workloads table with JSON config column (per-user) - Schemas: MinimumWorkloadConfig, MinimumWorkloadUpdate, MinimumWorkloadResponse - Service: CRUD operations + check_workload_warnings() entry point for BE-CAL-007 - API: GET/PUT/PATCH /calendar/workload-config (self + admin routes) - Migration: auto-create minimum_workloads table on startup - Registered calendar router in main.py