Hotfix: Add missing import

main.py

@@ -1,5 +1,6 @@
 from datetime import datetime
 from typing import List
+import unicodedata
 
 import uvicorn
 from fastapi import FastAPI, HTTPException, Header
@@ -9,8 +10,6 @@ from escpos.printer import Usb
 from escpos.capabilities import get_profile
 from PIL import Image
 
-PRINTER = Usb(0x28e9, 0x0289, profile="simple")
-
 MAX_LINE_LEN = 32
 SECRET_PASSWORD = "Alkohol1"
 
@@ -27,13 +26,11 @@ class Order(BaseModel):
     seat_id: str
     items: List[OrderItem]
 
+def get_printer() -> Usb:
+    return Usb(0x28e9, 0x0289, profile="simple")
 
 def sanitize_text(text: str) -> str:
-    return (text.replace("ä", "ae")
+    return unicodedata.normalize("NFKD", text).encode("ascii", "ignore").decode()
-                .replace("ö", "oe")
-                .replace("ü", "ue")
-                .replace("ß", "ss"))
-
 
 def build_header(order: Order, copy_num: int) -> str:
     return (
@@ -89,7 +86,7 @@ api = FastAPI()
 
 
 @api.post("/print_order")
-async def print_order_api_endpoint(order: Order, x_password: str = Header(None)):
+def print_order_api_endpoint(order: Order, x_password: str = Header(None)):
     if x_password != SECRET_PASSWORD:
         raise HTTPException(status_code=401, detail="Unauthorized")
 
@@ -99,7 +96,9 @@ async def print_order_api_endpoint(order: Order, x_password: str = Header(None))
 
     for copy_num in range(1, 3):
         try:
-            print_order(order, PRINTER, copy_num)
+            printer = get_printer()
+            print_order(order, printer, copy_num)
+            printer.close()
         except Exception as e:
             raise HTTPException(status_code=500, detail=f"Printing failed: {str(e)}")