Single part at the root, COMPOSE_FILE in .env

template/{{ part_dir }}/src/{% if 'api' in backend_services %}api{% endif %}/app.py.jinja

@@ -0,0 +1,53 @@
+from collections.abc import AsyncGenerator
+from contextlib import asynccontextmanager
+{% if serve_spa %}from pathlib import Path
+{% endif %}
+{% if use_dishka %}from dishka.integrations.fastapi import setup_dishka
+{% endif %}from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+{% if serve_spa %}from fastapi.responses import FileResponse
+{% endif %}
+from api import routers
+{% if use_dishka %}from dependencies.container import container
+{% endif %}{% if database != 'none' %}from utils.db import init_db
+{% endif %}{% if serve_spa %}from utils.env import env
+{% endif %}from utils.logging import setup_logging
+{% if serve_spa %}
+IMMUTABLE_HEADERS = {"Cache-Control": "public, max-age=31536000, immutable"}
+NO_CACHE_HEADERS = {"Cache-Control": "no-cache"}
+{% endif %}
+
+@asynccontextmanager
+async def lifespan(app_: FastAPI) -> AsyncGenerator[None]:
+    setup_logging()
+    {%- if database != 'none' %}
+    await init_db()
+    {%- endif %}
+    yield
+    {%- if use_dishka %}
+    await app_.state.dishka_container.close()
+    {%- endif %}
+
+
+app = FastAPI(title="{{ project_name }} API", lifespan=lifespan)
+
+app.add_middleware(
+    CORSMiddleware, allow_origins=["*"], allow_methods=["*"], allow_headers=["*"]
+)
+
+app.include_router(routers.router)
+{% if serve_spa %}
+spa_dir = Path(env.api.static_dir).resolve()
+if spa_dir.is_dir():
+
+    @app.get("/{spa_path:path}")
+    async def serve_spa(spa_path: str) -> FileResponse:
+        candidate = (spa_dir / spa_path).resolve()
+        if spa_path and candidate.is_relative_to(spa_dir) and candidate.is_file():
+            immutable = spa_path.startswith("_app/immutable/")
+            headers = IMMUTABLE_HEADERS if immutable else NO_CACHE_HEADERS
+            return FileResponse(candidate, headers=headers)
+        return FileResponse(spa_dir / "index.html", headers=NO_CACHE_HEADERS)
+{% endif %}
+{% if use_dishka %}setup_dishka(container, app)
+{% endif %}