diff --git a/payphone/cogs/easter/cog.py b/payphone/cogs/easter/cog.py
index 0476460..26cfbcf 100644
--- a/payphone/cogs/easter/cog.py
+++ b/payphone/cogs/easter/cog.py
@@ -41,6 +41,7 @@ class Easter(base.Cog):
             return
 
         channel_rs.mask = new_mask.value
+        channel_rs.is_masked = True
         await channel_rs.save()
 
 
diff --git a/payphone/db/models.py b/payphone/db/models.py
index 99eecc7..9f3ea2b 100644
--- a/payphone/db/models.py
+++ b/payphone/db/models.py
@@ -26,7 +26,7 @@ class User(models.Model):
 
 
 class Call(models.Model):
-    started_at = fields.DatetimeField(auto_now_add=True)
+    started_at = fields.DatetimeField(auto_now_add=True, db_index=True)
     ended_at = fields.DatetimeField(null=True, default=None)
 
     channels: fields.BackwardFKRelation["Channel"]