last ...

Providers/Entities/XStringSeederBase.cs

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+using xDataService.Configuration;
+using xDataService.Interfaces;
+using xDataService.Providers;
+using xStringService.Interfaces;
+using xStringService.Models.Entities;
+
+namespace xStringService.Providers.Entities
+{
+    public abstract class XStringSeederBase : XBaseDbSeeder<XString, int>, IXStringSeeder
+    {
+        protected XStringSeederBase(
+            string entity, 
+            string database, 
+            IXBaseRepository<XString, int> repository, 
+            XDataServiceConfiguration dataServiceConfiguration
+        ) : base(
+            entity, 
+            database, 
+            repository, 
+            dataServiceConfiguration
+        )
+        { }
+    }
+}

Providers/XStringEntityRegisterar.cs

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+using Microsoft.EntityFrameworkCore;
+using xDataService.Interfaces;
+using xDataService.Providers;
+using xStringService.Models.Entities;
+
+namespace xStringService.Providers
+{
+    /// <summary>
+    /// an Entity Registerar class for XStringService ...
+    /// </summary>
+    public class XStringEntityRegisterar : XBaseEntityRegisterar, IXEntityRegisterar
+    {
+        public XStringEntityRegisterar()
+        : base(nameof(XStringEntityRegisterar))
+        {
+            //
+            // Add XString Entity ...
+            AddEntity<XString, int>();
+        }
+
+        /// <summary>
+        /// Configure Entities ...
+        /// </summary>
+        /// <param name="modelBuilder"></param>
+        public override void ConfigureEntities(ModelBuilder modelBuilder)
+        {
+            base.ConfigureEntities(modelBuilder);
+        }
+    }
+}