---
title: Reno Scheduling Engine
emoji: 🏗️
colorFrom: blue
colorTo: indigo
sdk: docker
app_port: 7860
pinned: false
---

# Reno Scheduling Engine — Phase 2 (calendar-aware Day-0 scheduler)

A production-style DAG scheduler for a renovation/construction platform, built in
Python (FastAPI + SQLite + Streamlit). It turns BOQ items into activities via
configurable templates, builds a cycle-checked dependency DAG, and runs a CPM
forward pass against real working-time calendars (weekends, holidays,
reduced-permit windows, per-contractor calendars) plus PM pins — producing an
immutable, versioned **Day-0 baseline** schedule with a Gantt view.

## What's inside

- **Rules Engine** — BOQ item → activities + intra-item dependencies (template-driven).
- **DAG Service** — Kahn cycle check, topological sort, descendants.
- **Calendar Service** — timezone-correct working-time math (DST-safe via `zoneinfo`).
- **Scheduling Engine** — CPM forward pass → versioned `schedule_versions`.
- **Streamlit tester** — create projects/BOQ/dependencies, compute a baseline, and a
  **Day-0 Explainability** tab that derives every date step-by-step with a
  critical-path Gantt + DAG.

## Run locally

```bash
pip install -r requirements.txt
python -m scripts.migrate up
python -m scripts.seed
python -m uvicorn app.api.app:app --port 8000      # API
streamlit run streamlit_app.py                      # UI on http://localhost:8501
python -m pytest                                    # 53 tests
```

On the Space, `start.sh` runs migrations + seed, starts the API internally, and
serves the Streamlit UI on port 7860.

See `docs/` for the architecture, data inventory, and phase notes.