diff --git a/rowers/models.py b/rowers/models.py
index 16446319..a752b790 100644
--- a/rowers/models.py
+++ b/rowers/models.py
@@ -160,6 +160,7 @@ def auto_delete_strokedata_on_delete(sender, instance, **kwargs):
 class StrokeData(models.Model):
     class Meta:
         db_table = 'strokedata'
+        index_together = ['workoutid']
 
     workoutid = models.IntegerField(null=True)
     time = models.FloatField(null=True)