fix: explicit milliseconds precision of timestamp columns

scripts/count_duplicates_by_user.sql

@@ -1,11 +1,8 @@
 SELECT s2.user_id, sum(c) as count, total, (sum(c) / total) as ratio
 FROM (
-         SELECT time,
-                user_id,
-                entity,
-                COUNT(time) as c
+         SELECT time, user_id, entity, is_write, branch, editor, machine, operating_system, COUNT(time) as c
          FROM heartbeats
-         GROUP BY time, user_id, entity
+         GROUP BY time, user_id, entity, is_write, branch, editor, machine, operating_system
          HAVING COUNT(time) > 1
      ) s2
          LEFT JOIN (SELECT user_id, count(id) AS total FROM heartbeats GROUP BY user_id) s3 ON s2.user_id = s3.user_id