[BUG]: Incorrect Model Name Handling

[pysashapy]

In aerich.migrate:234, the current code fails to handle application names with multiple periods (e.g., example.account.models), incorrectly splitting the name and using the second segment.

Current Code:

model = cls._get_model(new_model_describe["name"].split(".")[1])

Suggested Fix:

model = cls._get_model(new_model_describe["name"].split(".")[-1])

[pysashapy]

I also noticed that after initially running init-db, I can add a new app, but migrations won't be created unless I manually create the folder migrations/{{APP}}. After that, a migration file is created, but with an error: aerich\migrate.py:64 in _get_model (KeyError: {{MODEL NAME}})

Despite this error during migration creation, I can still run migrate, which completes successfully, even though the error in aerich\migrate.py:64 in _get_model occurs during migration generation.

[pysashapy]

my config

{'apps': {'aerich': {'default_connection': 'default',
                     'models': ['aerich.models']},
          'apptest': {'default_connection': 'default',
                      'models': ['apptest.models']},
          'fasttower.auth': {'default_connection': 'default',
                             'models': ['fasttower.auth.models']}},
 'connections': {'default': {'credentials': {'file_path': 'full_path/to/db.sqlite3'},
                             'engine': 'tortoise.backends.sqlite'}},
 'timezone': 'UTC',
 'use_tz': True}