# 08 — Concepts

Status: skeleton

Document key concepts, domain models, and terminology used throughout the architecture documentation.

## Data Model Highlights

- `scenario`: central entity describing a mining scenario; owns relationships to cost, consumption, production, equipment, and maintenance tables.
- `capex`, `opex`: monetary tracking linked to scenarios.
- `consumption`: resource usage entries parameterized by scenario and description.
- `parameter`: scenario inputs with base `value` and optional distribution linkage via `distribution_id`, `distribution_type`, and JSON `distribution_parameters` to support simulation sampling.
- `production_output`: production metrics per scenario.
- `equipment` and `maintenance`: equipment inventory and maintenance events with dates/costs.
- `simulation_result`: staging table for future Monte Carlo outputs (not yet populated by `run_simulation`).

Foreign keys secure referential integrity between domain tables and their scenarios, enabling per-scenario analytics.