mock_user = {
    "104582": {
        "first_name": "Lena",
        "last_name": "Meier",
        "address": "Friedrichstraße 123, 10117 Berlin",
        "email": "lena.meier@example.de",
        "phone": "+49 30 12345678",
        "contract_number": "4821/9384721", 
    },
    "215493": {
        "first_name": "Markus",
        "last_name": "Keller",
        "address": "Prenzlauer Allee 45, 10405 Berlin",
        "email": "markus.keller@example.de",
        "phone": "+49 30 23456789",
       "contract_number": "1740/2847563",
    },
    "309572": {
        "first_name": "Sophie",
        "last_name": "Brunner",
        "address": "Karl-Marx-Straße 3, 12043 Berlin",
        "email": "sophie.brunner@example.de",
        "phone": "+49 30 34567890",
        "contract_number": "0100/12576240",
    },
    "407183": {
        "first_name": "Nico",
        "last_name": "Baumann",
        "address": "Kurfürstendamm 22, 10719 Berlin",
        "email": "nico.baumann@example.de",
        "phone": "+49 30 45678901",
        "contract_number": "3652/7482956",
    },
    "512948": {
        "first_name": "Mira",
        "last_name": "Schmid",
        "address": "Alexanderplatz 18, 10178 Berlin",
        "email": "mira.schmid@example.de",
        "phone": "+49 30 56789012",
        "contract_number": "8093/6271830",
    },
    "613405": {
        "first_name": "Daniel",
        "last_name": "Fischer",
        "address": "Frankfurter Allee 55, 10247 Berlin",
        "email": "daniel.fischer@example.de",
        "phone": "+49 30 67890123",
        "contract_number": "2517/9038472",
    },
    "728490": {
        "first_name": "Sara",
        "last_name": "Huber",
        "address": "Leipziger Straße 104, 10117 Berlin",
        "email": "sara.huber@example.de",
        "phone": "+49 30 78901234",
    },
    "834762": {
        "first_name": "Julian",
        "last_name": "Vogel",
        "address": "Hauptstraße 23, 10827 Berlin",
        "email": "julian.vogel@example.de",
        "phone": "+49 30 89012345",
        "contract_number": "0100/12576250",
    },
    "945128": {
        "first_name": "Laura",
        "last_name": "Maurer",
        "address": "Torstraße 6, 10119 Berlin",
        "email": "laura.maurer@example.de",
        "phone": "+49 30 90123456",
        "contract_number": "0100/12576260",
    },
    "159348": {
        "first_name": "David",
        "last_name": "Graf",
        "address": "Potsdamer Straße 20, 10785 Berlin",
        "email": "david.graf@example.de",
        "phone": "+49 30 91234567",
        "contract_number": "0100/12576270",
    },
    "263759": {
        "first_name": "Anna",
        "last_name": "Weber",
        "address": "Wilhelmstraße 45, 10963 Berlin",
        "email": "anna.weber@example.de",
        "phone": "+49 30 12349876",
        "contract_number": "0100/12576280",
    },
    "375820": {
        "first_name": "Lukas",
        "last_name": "Steiner",
        "address": "Müllerstraße 85, 13349 Berlin",
        "email": "lukas.steiner@example.de",
        "phone": "+49 30 23498765",
        "contract_number": "0100/12576290",
    },
    "481267": {
        "first_name": "Nina",
        "last_name": "Marti",
        "address": "Oranienstraße 1, 10999 Berlin",
        "email": "nina.marti@example.de",
        "phone": "+49 30 34598765",
        "contract_number": "0100/12576300",
    },
    "596481": {
        "first_name": "Tim",
        "last_name": "Arnold",
        "address": "Gneisenaustraße 20, 10961 Berlin",
        "email": "tim.arnold@example.de",
        "phone": "+49 30 45612378",
        "contract_number": "0100/12576310",
    }
}