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

services/duration.go

@@ -80,8 +80,12 @@ func (srv *DurationService) Get(from, to time.Time, user *models.User, filters *
 
 	for _, list := range mapping {
 		for _, d := range list {
+			// will only happen if two heartbeats with different hashes (e.g. different project) have the same timestamp
+			// that, in turn, will most likely only happen for mysql, where `time` column's precision was set to second for a while
+			// assume that two non-identical heartbeats with identical time are sub-second apart from each other, so round up to expectancy value
+			// also see https://github.com/muety/wakapi/issues/340
 			if d.Duration == 0 {
-				d.Duration = HeartbeatDiffThreshold
+				d.Duration = 500 * time.Millisecond
 			}
 			durations = append(durations, d)
 		}

services/duration_test.go

@@ -65,6 +65,17 @@ func (suite *DurationServiceTestSuite) SetupSuite() {
 			Machine:         TestMachine1,
 			Time:            models.CustomTime(suite.TestStartTime.Add(30 * time.Second)), // 0:30
 		},
+		// duplicate of previous one
+		{
+			ID:              rand.Uint64(),
+			UserID:          TestUserId,
+			Project:         TestProject1,
+			Language:        TestLanguageGo,
+			Editor:          TestEditorGoland,
+			OperatingSystem: TestOsLinux,
+			Machine:         TestMachine1,
+			Time:            models.CustomTime(suite.TestStartTime.Add(30 * time.Second)), // 0:30
+		},
 		{
 			ID:              rand.Uint64(),
 			UserID:          TestUserId,