refactor: simplify project, no behavior change

- requirements.txt: drop pinned transitive deps (pyaes, pyasn1, rsa)
- .gitignore: trim from 166 to 19 lines (drop unused template cruft)
- crawl.py: remove no-op client.start(phone) after explicit sign-in
- common.py: inline single-use latest_two_group_exports into compare.py;
  simplify _member_index
- compare.py: use list_group_exports + slice; add lazy-import comment
- configure.py: add lazy-import comment
- config.py: lowercase error messages to match the rest of the project

.gitignore

@@ -1,166 +1,19 @@
+# project
 *.session
 *.csv
 plans/
 
-
-
-# Byte-compiled / optimized / DLL files
+# python
 __pycache__/
 *.py[cod]
 *$py.class
 
-# C extensions
-*.so
-
-# Distribution / packaging
-.Python
-build/
-develop-eggs/
-dist/
-downloads/
-eggs/
-.eggs/
-lib/
-lib64/
-parts/
-sdist/
-var/
-wheels/
-share/python-wheels/
-*.egg-info/
-.installed.cfg
-*.egg
-MANIFEST
-
-# PyInstaller
-#  Usually these files are written by a python script from a template
-#  before PyInstaller builds the exe, so as to inject date/other infos into it.
-*.manifest
-*.spec
-
-# Installer logs
-pip-log.txt
-pip-delete-this-directory.txt
-
-# Unit test / coverage reports
-htmlcov/
-.tox/
-.nox/
-.coverage
-.coverage.*
-.cache
-nosetests.xml
-coverage.xml
-*.cover
-*.py,cover
-.hypothesis/
-.pytest_cache/
-cover/
-
-# Translations
-*.mo
-*.pot
-
-# Django stuff:
-*.log
-local_settings.py
-db.sqlite3
-db.sqlite3-journal
-
-# Flask stuff:
-instance/
-.webassets-cache
-
-# Scrapy stuff:
-.scrapy
-
-# Sphinx documentation
-docs/_build/
-
-# PyBuilder
-.pybuilder/
-target/
-
-# Jupyter Notebook
-.ipynb_checkpoints
-
-# IPython
-profile_default/
-ipython_config.py
-
-# pyenv
-#   For a library or package, you might want to ignore these files since the code is
-#   intended to run in multiple environments; otherwise, check them in:
-# .python-version
-
-# pipenv
-#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
-#   However, in case of collaboration, if having platform-specific dependencies or dependencies
-#   having no cross-platform support, pipenv may install dependencies that don't work, or not
-#   install all needed dependencies.
-#Pipfile.lock
-
-# poetry
-#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
-#   This is especially recommended for binary packages to ensure reproducibility, and is more
-#   commonly ignored for libraries.
-#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
-#poetry.lock
-
-# pdm
-#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
-#pdm.lock
-#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
-#   in version control.
-#   https://pdm.fming.dev/#use-with-ide
-.pdm.toml
-
-# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
-__pypackages__/
-
-# Celery stuff
-celerybeat-schedule
-celerybeat.pid
-
-# SageMath parsed files
-*.sage.py
-
-# Environments
+# env
 .env
-.venv
-env/
+.venv/
 venv/
-ENV/
-env.bak/
-venv.bak/
+env/
 
-# Spyder project settings
-.spyderproject
-.spyproject
-
-# Rope project settings
-.ropeproject
-
-# mkdocs documentation
-/site
-
-# mypy
-.mypy_cache/
-.dmypy.json
-dmypy.json
-
-# Pyre type checker
-.pyre/
-
-# pytype static type analyzer
-.pytype/
-
-# Cython debug symbols
-cython_debug/
-
-# PyCharm
-#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
-#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
-#  and can be added to the global gitignore or merged into this file.  For a more nuclear
-#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+# tooling
 .idea/
+.claude/

common.py

@@ -84,14 +84,6 @@ def get_group_export(group_id, run_time):
         return None
 
 
-def latest_two_group_exports(group_id):
-    """Return the latest two export records for a group."""
-    exports = list_group_exports(group_id)
-    if len(exports) < 2:
-        return None, None
-    return exports[-2], exports[-1]
-
-
 def diff_group_members(before_record, after_record):
     """Compare two group export records by Telegram member id."""
     before_members = _member_index(before_record)
@@ -106,12 +98,11 @@ def diff_group_members(before_record, after_record):
 
 
 def _member_index(record):
-    members = {}
-    for member in record.get('members', []):
-        member_id = member.get('id')
-        if member_id is not None:
-            members[int(member_id)] = member
-    return members
+    return {
+        int(member['id']): member
+        for member in record.get('members', [])
+        if member.get('id') is not None
+    }
 
 
 def _is_run_time(value):

compare.py

@@ -26,7 +26,8 @@ def parse_args():
 def main():
     args = parse_args()
 
-    from common import diff_group_members, get_group_export, latest_two_group_exports
+    # Lazy import: keeps `python compare.py --help` working when REDIS_URL is unset.
+    from common import diff_group_members, get_group_export, list_group_exports
 
     if args.times:
         before_time, after_time = args.times
@@ -39,10 +40,11 @@ def main():
             print(f'export not found for group {args.group_id} at {after_time}', file=sys.stderr)
             return 1
     else:
-        before_record, after_record = latest_two_group_exports(args.group_id)
-        if before_record is None or after_record is None:
+        exports = list_group_exports(args.group_id)
+        if len(exports) < 2:
             print(f'need at least 2 exports for group {args.group_id}', file=sys.stderr)
             return 1
+        before_record, after_record = exports[-2:]
 
     added, removed = diff_group_members(before_record, after_record)
     print_summary(args.group_id, before_record, after_record, added, removed)

config.py

@@ -26,19 +26,19 @@ def load_app_config():
     raw = redis_client.get(key('config'))
     if not raw:
         raise SystemExit(
-            'Telegram config not found in Redis. Run configure.py first.'
+            'telegram config not found in Redis. run configure.py first.'
         )
     try:
         config = json.loads(raw)
     except ValueError as exc:
-        raise SystemExit('Telegram config in Redis is not valid JSON.') from exc
+        raise SystemExit('telegram config in Redis is not valid JSON.') from exc
 
     missing = [
         name for name in ('api_id', 'api_hash', 'phone', 'group_ids')
         if not config.get(name)
     ]
     if missing:
-        raise SystemExit(f'Telegram config missing: {", ".join(missing)}')
+        raise SystemExit(f'telegram config missing: {", ".join(missing)}')
 
     return {
         'api_id': int(config['api_id']),

configure.py

@@ -64,6 +64,7 @@ def main():
     phone = prompt_phone(args.phone)
     group_ids = prompt_groups(args.groups)
 
+    # Lazy import: keeps `python configure.py --help` working when REDIS_URL is unset.
     from config import save_app_config
 
     config = save_app_config(api_id, api_hash, phone, group_ids)

crawl.py

@@ -28,7 +28,6 @@ def main():
         except SessionPasswordNeededError:
             client.sign_in(password=getpass.getpass())
 
-    client.start(phone)
     save_session(client.session.save())
 
     run_time = new_run_time()

requirements.txt

@@ -1,6 +1,3 @@
-pyaes==1.6.1
-pyasn1==0.6.3
 python-dotenv==1.2.2
 redis[hiredis]==5.2.1
-rsa==4.9.1
 Telethon==1.42.0