@@ -0,0 +4,4 @@
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+

@@ -0,0 +17,4 @@
+
+    List<PeriodDataModel> GetAllPeriodsByStartTime(DateTime fromDate, DateTime toDate);
+
+    List<PeriodDataModel> GetAllPeriodsByEndTime(DateTime fromDate, DateTime toDate);

@@ -0,0 +18,4 @@
+    ClerkDataModel? GetElementByName(string name);
+
+    ClerkDataModel? GetElementBySurname(string surname);
+

@@ -0,0 +13,4 @@
+
+    CreditProgramDataModel? GetElementById(string id);
+
+    void AddElement(CreditProgramDataModel creditProgramDataModel);