tank_stats = {
    'role_id': 1,
    'health': 150,
    'energy': 70,
    'attack': 10,
    'magic': 5,
    'speed': 5
}

mage_stats = {
    'role_id': 2,
    'health': 70,
    'energy': 80,
    'attack': 7,
    'magic': 6,
    'speed': 5
}

warrior_stats = {
    'role_id': 3,
    'health': 100,
    'energy': 60,
    'attack': 12,
    'magic': 4,
    'speed': 5
}

max_stats = {
    'health': 300,
    'energy': 150,
    'attack': 20,
    'magic': 10,
    'speed': 10
}

upgrade_costs = {
    'health': 100,
    'energy': 100,
    'attack': 100,
    'magic': 100,
    'speed': 100
}