diff --git a/server.py b/server.py
index a12cc14..c7fec00 100644
--- a/server.py
+++ b/server.py
@@ -1,3 +1,4 @@
+import contextlib
 import io
 import json
 import os
@@ -124,7 +125,7 @@ CACHE_FILE = CACHE_DIR / "db.sqlite3"
 logging.debug("Cache file: %r", CACHE_FILE)
 
 
-@app.on_event("startup")
+@contextlib.asynccontextmanager
 async def startup():
     if not CACHE_DIR.exists():
         CACHE_DIR.mkdir(parents=True)
@@ -139,6 +140,7 @@ async def startup():
             )
             """
         )
+    yield
 
 
 def upload_media(domain: str, access_token: str, file: io.BytesIO, filename: str, content_type: str):
@@ -196,7 +198,7 @@ def preview_url(
         cursor = conn.cursor()
         cursor.execute(
             "SELECT metadata,ts FROM cache WHERE url = ?",
-            (url, ts)
+            (url,)
         )
         results = cursor.fetchall()
         if results: