feat: add PairPeriod for ApiDto

ApiDto/Common/PairPeriodTime.cs

@@ -0,0 +1,22 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Mirea.Api.Dto.Common;
+
+/// <summary>
+/// Represents a pair of time periods.
+/// </summary>
+public class PairPeriodTime
+{
+    /// <summary>
+    /// Gets or sets the start time of the period.
+    /// </summary>
+    [Required]
+    public TimeOnly Start { get; set; }
+
+    /// <summary>
+    /// Gets or sets the end time of the period.
+    /// </summary>
+    [Required]
+    public TimeOnly End { get; set; }
+}