Properly implement lifespan

server.py

@@ -19,6 +19,25 @@ from rich.logging import RichHandler
 from fastapi.middleware.cors import CORSMiddleware
 
 
+
+@contextlib.asynccontextmanager
+async def startup(_):
+    if not CACHE_DIR.exists():
+        CACHE_DIR.mkdir(parents=True)
+    with sqlite3.connect(CACHE_FILE) as conn:
+        conn.execute(
+            """
+            CREATE TABLE IF NOT EXISTS cache (
+                uuid TEXT PRIMARY KEY,
+                url TEXT NOT NULL,
+                ts INTEGER NOT NULL,
+                metadata TEXT NOT NULL
+            )
+            """
+        )
+    yield
+
+
 logging.basicConfig(
     level=logging.getLevelName(os.environ.get("LOG_LEVEL", "INFO").upper()),
     format="%(message)s",
@@ -27,6 +46,7 @@ logging.basicConfig(
 )
 app = fastapi.FastAPI(
     root_path=os.environ.get("PREVIEW_ROOT_PATH", ""),
+    lifespan=startup
 )
 app.add_middleware(
     CORSMiddleware,
@@ -127,24 +147,6 @@ CACHE_FILE.touch(exist_ok=True)
 logging.debug("Cache file: %r", CACHE_FILE)
 
 
-@contextlib.asynccontextmanager
-async def startup():
-    if not CACHE_DIR.exists():
-        CACHE_DIR.mkdir(parents=True)
-    with sqlite3.connect(CACHE_FILE) as conn:
-        conn.execute(
-            """
-            CREATE TABLE IF NOT EXISTS cache (
-                uuid TEXT PRIMARY KEY,
-                url TEXT NOT NULL,
-                ts INTEGER NOT NULL,
-                metadata TEXT NOT NULL
-            )
-            """
-        )
-    yield
-
-
 def upload_media(domain: str, access_token: str, file: io.BytesIO, filename: str, content_type: str):
     file.seek(0)
     logging.info(