Add project files.

SysApp/DBModels/DBManagement.cs

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+namespace SysApp.DBModels
+{
+    public class DBManagement
+    {
+        public static string GetConnectionString()
+        {
+            string fp = Path.GetFullPath("Keys/db/");
+            //172.168.192.204
+            return string.Format(@"Server=103.150.124.135;Port=3306;Database=VinFontDB;user=vfontdb;password=VFPgq(%b7r2025;SslMode=Required;ssl-ca={0};ssl-cert={1};ssl-key={2};charset=utf8mb4;", fp + "ca-cert.pem", fp + "client-cert.pem", fp+"client-key.pem");
+        }
+
+    }
+}

SysApp/DBModels/TypeStorageServer.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace SysApp.DBModels
+{
+    public class TypeStorageServer
+    {
+        [Key]
+        public int IdTypeStorageServer {  get; set; }   
+        public string TypeName { get; set; }
+
+        public TypeStorageServer()
+        {
+            IdTypeStorageServer = 0; 
+            TypeName = string.Empty;    
+        }
+    }
+}

SysApp/DBModels/ValidationDomain.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace SysApp.DBModels
+{
+    public class ValidationDomain
+    {
+        [Key]
+        public int IdValidationDomain { set; get; }
+
+        public string Protocol { set; get; }
+        public int PortNumber { set; get; }
+        public string DomainName { set; get; }
+
+        public ValidationDomain()
+        {
+            IdValidationDomain = 0;
+            Protocol = string.Empty;
+            DomainName = string.Empty;
+            PortNumber = -1;
+        }
+    }
+}