15:    BASE_URL: str = "http://localhost:8000"
16:    FRONTEND_BASE_URL: str = "http://localhost:8000"
19:    DATABASE_URL: str = "postgresql+psycopg://mailer:mailer_dev_pw@localhost:5432/bulkmailer"
70:    UNSUBSCRIBE_BASE: str = ""  # defaults to BASE_URL
===routes in main.py===
1:"""FastAPI application entrypoint: routers, static files, security headers, startup."""
7:from fastapi.staticfiles import StaticFiles
61:app.mount("/static", StaticFiles(directory="static"), name="static")
64:@app.get("/api/health")
80:@app.get("/", include_in_schema=False)
82:    return FileResponse("static/index.html")
85:@app.get("/{page}", include_in_schema=False)
89:    path = f"static/{safe}.html"