Planned and executed phase001

planning/phase002

@@ -0,0 +1,28 @@
+# Phase 002: Core Data Model
+
+## Goal
+Create the relational model foundation for users, vehicles, fuel entries, maintenance entries, and maintenance schedules.
+
+## Work
+- Create `User` with `name` and `email`.
+- Create `Vehicle` with `make`, `model`, `year`, `color`, `vin`, `licence_plate`, `current_odometer`, and `fuel_tank_size`.
+- Create `MaintenanceSchedule` belonging to `Vehicle`.
+- Create `FuelEntry` belonging to `Vehicle` and `User` as `updated_by_user`.
+- Create `MaintenanceEntry` belonging to `Vehicle` and `User` as `updated_by_user`.
+- Add validations for required fields and basic numeric constraints.
+- Add model specs for associations, validations, and simple behavior.
+
+## Notes
+- Correct likely typo from design: `licence_place` should probably be `licence_plate`.
+- Correct likely typo from design: `MainetnanceEntry` should be `MaintenanceEntry`.
+
+## Deliverables
+- Database migrations.
+- ActiveRecord models.
+- Model specs.
+- Factories.
+
+## Acceptance Criteria
+- All model specs pass.
+- Associations match the design.
+- Invalid records are rejected with useful validation errors.