Add Splitwise clone backend

app/main.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+from collections.abc import AsyncIterator
+from contextlib import asynccontextmanager
+
+from starlette.applications import Starlette
+from starlette.middleware import Middleware
+from starlette.routing import Route
+from tortoise import Tortoise
+
+from app.auth import OIDCAuthMiddleware, init_oidc
+from app.config import settings
+from app.resources.expenses import create_expense_report, list_expense_reports
+
+
+@asynccontextmanager
+async def lifespan(app: Starlette) -> AsyncIterator[None]:
+    await Tortoise.init(
+        db_url=settings.database_url,
+        modules={"models": ["app.models"]},
+    )
+    await Tortoise.generate_schemas(safe=True)
+    await init_oidc()
+    yield
+    await Tortoise.close_connections()
+
+
+routes = [
+    Route("/api/expense-reports", endpoint=create_expense_report, methods=["POST"]),
+    Route("/api/expense-reports", endpoint=list_expense_reports, methods=["GET"]),
+]
+
+middleware = [
+    Middleware(OIDCAuthMiddleware),
+]
+
+app = Starlette(routes=routes, middleware=middleware, lifespan=lifespan)