Refactoring create_db.py

[bralbral]

Hi!

The old version of the create_db.py code crashes with a divide-by-zero error.

Some logs:

/app/create_db.py:59: SyntaxWarning: "\s" is an invalid escape sequence. Such sequences will not work in the future. Did you mean "\\s"? A raw string is also an option.
  match = re.findall(b'^%s:\s?(.+)$' % (name), block, re.MULTILINE)
Process Process-6:
Traceback (most recent call last):
  File "/usr/local/lib/python3.14/multiprocessing/process.py", line 320, in _bootstrap
    self.run()
    ~~~~~~~~^^
  File "/usr/local/lib/python3.14/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/create_db.py", line 224, in parse_blocks
    percent = (BLOCKS_DONE * NUM_WORKERS * 100) / NUM_BLOCKS
              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
ZeroDivisionError: division by zero
Process Process-2:
Traceback (most recent call last):
  File "/usr/local/lib/python3.14/multiprocessing/process.py", line 320, in _bootstrap
    self.run()
    ~~~~~~~~^^
  File "/usr/local/lib/python3.14/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/create_db.py", line 224, in parse_blocks
    percent = (BLOCKS_DONE * NUM_WORKERS * 100) / NUM_BLOCKS
              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
ZeroDivisionError: division by zero

After refactoring the code, I fixed it and also eliminated the use of global variables.

[firefart]

Why did you remove all comments and the whole last_modified fallback?

[bralbral]

Why did you remove all comments and the whole last_modified fallback?

Sorry about that, my bad. I have re-added them.

Also, I have added an environment variable to connect to the database.

Additionally, export in mmdb format (MaxMind) has been added.

[firefart]

please make single pull requests with small changes instead of those big ones. This is too much to review and test at once