MAINT: Make return of GetCountResult long

include/caosdb/transaction.h

@@ -364,7 +364,7 @@ public:
    * this transaction. In all other cases, the return value will be
    * -1.
    */
-  [[nodiscard]] inline auto GetCountResult() const -> int {
+  [[nodiscard]] inline auto GetCountResult() const -> long {
     return query_count;
   }