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app/main.py

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+from __future__ import annotations
+
+from collections.abc import AsyncGenerator
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+
+from app.core.config import settings
+from app.core.logging_config import setup_logging
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
+    # ── Startup ──────────────────────────────────────
+    setup_logging()
+
+    from app.db.mariadb import init_mariadb
+    from app.db.mongodb import init_mongodb
+    from app.db.redis import init_redis
+
+    await init_mariadb()
+    await init_mongodb()
+    await init_redis()
+
+    yield
+
+    # ── Shutdown ─────────────────────────────────────
+    from app.communication.external.http_client import close_http_client
+    from app.db.mariadb import close_mariadb
+    from app.db.mongodb import close_mongodb
+    from app.db.redis import close_redis
+
+    await close_http_client()
+    await close_redis()
+    await close_mongodb()
+    await close_mariadb()
+
+
+def create_app() -> FastAPI:
+    app = FastAPI(
+        title=settings.APP_NAME,
+        version="0.1.0",
+        docs_url="/docs",
+        redoc_url="/redoc",
+        lifespan=lifespan,
+    )
+
+    # ── Middleware (order matters: last added = first executed) ───
+    from app.middleware.cors import add_cors_middleware
+    from app.middleware.request_id import RequestIDMiddleware
+    from app.middleware.request_logging import RequestLoggingMiddleware
+
+    add_cors_middleware(app)
+    app.add_middleware(RequestLoggingMiddleware)
+    app.add_middleware(RequestIDMiddleware)
+
+    # ── Error handlers ───────────────────────────────
+    from app.core.error_handlers import register_error_handlers
+
+    register_error_handlers(app)
+
+    # ── Routers ──────────────────────────────────────
+    from app.api.v1.router import v1_router
+
+    app.include_router(v1_router, prefix=settings.API_V1_PREFIX)
+
+    return app