analytics/lib: Remove unused imports (F401).

analytics/lib/counts.py

@@ -7,7 +7,7 @@ from analytics.models import InstallationCount, RealmCount, \
     last_successful_fill
 from zerver.models import Realm, UserProfile, Message, Stream, \
     UserActivityInterval, RealmAuditLog, models
-from zerver.lib.timestamp import floor_to_day, floor_to_hour, ceiling_to_day, \
+from zerver.lib.timestamp import floor_to_hour, ceiling_to_day, \
     ceiling_to_hour, verify_UTC
 
 from typing import Any, Callable, Dict, List, Optional, Text, Tuple, Type, Union

analytics/lib/fixtures.py

@@ -1,9 +1,5 @@
-from zerver.models import Realm, UserProfile, Stream, Message
-from analytics.models import InstallationCount, RealmCount, UserCount, StreamCount
 from analytics.lib.counts import CountStat
-from analytics.lib.time_utils import time_range
 
-from datetime import datetime
 from math import sqrt
 from random import gauss, random, seed
 from typing import List

analytics/lib/time_utils.py

@@ -1,5 +1,5 @@
 from zerver.lib.timestamp import floor_to_hour, floor_to_day, \
-    timestamp_to_datetime, verify_UTC
+    verify_UTC
 from analytics.lib.counts import CountStat
 
 from datetime import datetime, timedelta