diff --git a/check b/check
index b6207e1..0477a01 100755
--- a/check
+++ b/check
@@ -3,7 +3,13 @@ from datetime import datetime, timedelta
 
 from rescuetime import get_rescuetime
 
-rs = get_rescuetime(latest=1)
-latest_dt = rs[-1].dt
 
-assert (datetime.now() - latest_dt) < timedelta(days=1)
+def main():
+    rs = get_rescuetime(latest=1)
+    latest_dt = rs[-1].dt
+
+    assert (datetime.now() - latest_dt) < timedelta(days=1)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/rescuetime/__init__.py b/rescuetime/__init__.py
index 3f81d1a..dd9b9ba 100644
--- a/rescuetime/__init__.py
+++ b/rescuetime/__init__.py
@@ -2,7 +2,7 @@ import logging
 from pathlib import Path
 import json
 from datetime import datetime, timedelta
-from typing import NamedTuple, Dict, List, Set
+from typing import NamedTuple, Dict, List, Set, Optional
 from functools import lru_cache
 
 
@@ -47,11 +47,15 @@ class Entry(NamedTuple):
         return Entry(dt=dt, duration_s=dur, activity=activity)
 
 
-@lru_cache()
-def get_rescuetime(latest=None):
+@lru_cache(1)
+def get_rescuetime(latest: Optional[int]=None):
+    if latest is None:
+        latest = 0
+
     entries: Set[Entry] = set()
 
-    for fp in list(sorted(_PATH.glob('*.json')))[(0 if latest is None else -latest):]:
+    # pylint: disable=invalid-unary-operand-type
+    for fp in list(sorted(_PATH.glob('*.json')))[-latest:]:
         j = try_load(fp)
         if j is None:
             continue
diff --git a/rescuetime/__main__.py b/rescuetime/__main__.py
index 5568d64..2e5edbd 100644
--- a/rescuetime/__main__.py
+++ b/rescuetime/__main__.py
@@ -2,15 +2,18 @@ from kython.klogging import setup_logzero
 
 from . import get_logger, get_groups, get_rescuetime, fill_influxdb
 
-logger = get_logger()
-setup_logzero(logger)
+def main():
+    logger = get_logger()
+    setup_logzero(logger)
 
-# for gr in get_groups():
-#     print(f"{gr[0].dt}--{gr[-1].dt}")
-# for e in get_rescuetime(latest=2):
-#     print(e)
-fill_influxdb()
+    # for gr in get_groups():
+    #     print(f"{gr[0].dt}--{gr[-1].dt}")
+    # for e in get_rescuetime(latest=2):
+    #     print(e)
+    fill_influxdb()
 
-# TODO merged db?
-# TODO ok, it summarises my sleep intervals pretty well. I guess should adjust it for the fact I don't sleep during the day, and it would be ok!
+    # TODO merged db?
+    # TODO ok, it summarises my sleep intervals pretty well. I guess should adjust it for the fact I don't sleep during the day, and it would be ok!
 
+if __name__ == '__main__':
+    main()