diff --git a/core/db/db.go b/core/db/db.go
index 692ae0012..066068cdf 100644
--- a/core/db/db.go
+++ b/core/db/db.go
@@ -58,6 +58,7 @@ func (s *DB) Persist(session interface{}) {
 }
 
 // Return sessions
+// TODO make this part of server/db
 func (s *DB) Sessions() (Sessions, error) {
 	var res Sessions
 	tx := s.db.Find(&res)
diff --git a/server/http_session_handler.go b/server/http_session_handler.go
index 49f6c6c8c..ff48f1be7 100644
--- a/server/http_session_handler.go
+++ b/server/http_session_handler.go
@@ -60,8 +60,9 @@ func sessionHandler(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	whereQuery := "charged_kwh>=0.05 and strftime('%Y', created) like ? and strftime('%m', created) like ?"
-	if txn := dbserver.Instance.Where(whereQuery, fmtYear, fmtMonth).Order("created desc").Find(&res); txn.Error != nil {
+	// TODO support other databases than Sqlite
+	whereQuery := "charged_kwh>=0.05 AND strftime('%Y', created) LIKE ? AND strftime('%m', created) LIKE ?"
+	if txn := dbserver.Instance.Where(whereQuery, fmtYear, fmtMonth).Order("created DESC").Find(&res); txn.Error != nil {
 		jsonError(w, http.StatusInternalServerError, txn.Error)
 		return
 	}