Change default id regex

stechuhr_server/server.py

@@ -23,8 +23,8 @@ path = "visitors.db"
 
 # A list of possible regex patterns for the id (logical OR!)
 id_patterns = [
-    "^[A-z0-9]{24}$",
-    "^[A-Z0-9]{6,8}$",
+    "^[A-Fa-f0-9]{24}$",
+    "^[A-Fa-f0-9]{6,16}$",
 ]
 
 # minimum and maximum lengths for the received strings