Major rewrite

SoilMoistureAPI/Models/Device.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace SoilMoistureAPI.Models
+{
+    public class Device
+    {
+        [Key]
+        public string DeviceId { get; set; } // Primary Key
+
+        [Required]
+        [MaxLength(100)]
+        public string Nickname { get; set; }
+
+        // Navigation Property
+        public ICollection<SoilMoisture> SoilMoistures { get; set; }
+    }
+}

SoilMoistureAPI/Models/DeviceDto.cs

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+namespace SoilMoistureAPI.Models
+{
+    public class DeviceDto
+    {
+        public string DeviceId { get; set; }
+        public string Nickname { get; set; }
+    }
+}

SoilMoistureAPI/Models/SoilMoisture.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace SoilMoistureAPI.Models
+{
+    public class SoilMoisture
+    {
+        [Key]
+        public int Id { get; set; }
+
+        [Required]
+        [ForeignKey("Device")]
+        public string DeviceId { get; set; } // Foreign Key
+
+        [Required]
+        public float MoistureLevel { get; set; }
+
+        public DateTime Timestamp { get; set; } = DateTime.UtcNow;
+
+        // Navigation Property
+        public Device Device { get; set; }
+    }
+}

SoilMoistureAPI/Models/SoilMoistureDto.cs

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+namespace SoilMoistureAPI.Models
+{
+    public class SoilMoistureDto
+    {
+        public string DeviceId { get; set; }
+        public float MoistureLevel { get; set; }
+    }
+}