diff --git a/sql/schema_mysql.sql b/sql/schema_mysql.sql
index 9e66a98..1238a94 100644
--- a/sql/schema_mysql.sql
+++ b/sql/schema_mysql.sql
@@ -22,3 +22,5 @@ CREATE TABLE `locations` (
 ) DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT;
 
 CREATE INDEX `idx_getmarkers` ON `locations` (`epoch` DESC, `accuracy`, `altitude`);
+
+CREATE INDEX `idx_epochexisting` ON `locations` (`tracker_id`, `epoch` DESC);
diff --git a/sql/schema_sqlite.sql b/sql/schema_sqlite.sql
index 1b65a0c..64f4d14 100644
--- a/sql/schema_sqlite.sql
+++ b/sql/schema_sqlite.sql
@@ -28,3 +28,8 @@ CREATE INDEX "idx_getmarkers" ON "locations" (
   "accuracy",
   "altitude"
 );
+
+CREATE INDEX "idx_epochexisting" ON "locations" (
+  "tracker_id",
+  "epoch" DESC
+);