fix: duration aggregation for heartbeats with identical timestamps (resolve #340)

scripts/aggregate_durations.sql

@@ -0,0 +1,9 @@
+SELECT project, language, editor, operating_system, machine, branch, SUM(GREATEST(1, diff)) as 'sum'
+FROM (
+         SELECT project, language, editor, operating_system, machine, branch, TIME_TO_SEC(LEAST(TIMEDIFF(time, LAG(time) over w), '00:02:00')) as 'diff'
+         FROM heartbeats
+         WHERE user_id = 'n1try'
+             WINDOW w AS (ORDER BY time)
+     ) s2
+WHERE diff IS NOT NULL
+GROUP BY project, language, editor, operating_system, machine, branch;

scripts/count_duplicates_by_user.sql

@@ -0,0 +1,13 @@
+SELECT s2.user_id, sum(c) as count, total, (sum(c) / total) as ratio
+FROM (
+         SELECT time,
+                user_id,
+                entity,
+                COUNT(time) as c
+         FROM heartbeats
+         GROUP BY time, user_id, entity
+         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
+GROUP BY user_id
+ORDER BY count DESC;