Added: section to EF core for postgresql

Updated: regenerate initial migration

docs/en/Best-Practices/PostgreSQL-Integration.md

@@ -36,26 +36,28 @@ public class Acme.BookStore.EntityFrameworkCoreModule : AbpModule
     }
 ````
 
-### EntityFrameworkCore.DbMigrations Project Update
-- **Do** update to use PostgreSQL in `BookStoreMigrationsDbContextModelSnapshot.cs`
-	
-import `Npgsql.EntityFrameworkCore.PostgreSQL.Metadata` by adding
-	
-````C#
-using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
-````	
-	
-replace all references
+### Update Connection String Settings
+- **Do** Update the PostgreSQL connection string in all `appsettings.json` files.
+
+### Regenerate Initial igration & Update the Database
+Open the **Package Manager Console (PMC)** (under the *Tools/Nuget Package Manager* menu), select the `Acme.BookStore.EntityFrameworkCore.DbMigrations` as the **default project** and execute the following command:
+> Ensure your startup project is correcty set.
+
+#### Delete Existing Initial Migrations
+
+![postgresql-delete-initial-migrations](images/postgresql-delete-initial-migrations.png)
+
+Then create a new migration class inside the `Migrations` folder.
+
 ````
-.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+PM> Add-Migration Initial
 ````
 
- to
+Then execute the `Update-Database` command to update the database schema:
 
-````C#
-.HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.SerialColumn);
+````
+PM> Update-Database
 ````
 
-### Update Connection String Settings
-> Update the PostgreSQL connection string in all `appsettings.json` files
+![postgresql-update-database](images/postgresql-update-database.png)
 

docs/en/docs-nav.json

@@ -245,7 +245,13 @@
       "items": [
         {
           "text": "Entity Framework Core Integration",
-          "path": "Entity-Framework-Core.md"
+          "path": "Entity-Framework-Core.md",
+		  "items": [            
+            {
+              "text": "PostgreSQL Integration",
+              "path": "Best-Practices/PostgreSQL-Integration.md"
+            }
+          ]
         },
         {
           "text": "MongoDB Integration",