do not fail if local db doesn't exist

backend/src/app_factory.py

@@ -83,7 +83,10 @@ async def _database_lifespan(app: FastAPI):
             # If backup is enabled but no backup is found, delete local database to prevent confusion.
             print("Couldn't find backup in remote dataset.")
             print("Deleting local database for a fresh start.")
-            os.remove(constants.DATABASE_FILE)
+            try:
+                os.remove(constants.DATABASE_FILE)
+            except OSError:
+                pass
 
         # Start back-up scheduler
         print("Starting back-up scheduler (save every 5 minutes)...")