# Abstract classes.
from lib.common.abc import Module, Subdomain

# Manage the database.
from lib import database

class MyModule(Module):

    def __init__(self, target: str):
        self.target = target


    def run(self):
        pass

def run(self):

    # this list should contain all the subdomains
    # gathered after running module
    subdomains: list[Subdomain] = [
        Subdomain("s1.domain.com"), 
        Subdomain("s2.domain.com")
    ]

    # add the found subdomains to the database
    for subdomain in subdomains:
        database.add_subdomain(subdomain)

from modules.mymodule import MyModule

modules = (…, MyModule)