Refactor namespaces to follow new naming convention and add item model classes

DATABASE.md

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+# Database Setup and Migration Guide
+
+## Prerequisites
+- .NET 8.0 SDK
+- Entity Framework Core tools
+
+## Install EF Core Tools
+```sh
+dotnet tool install --global dotnet-ef
+```
+
+### Creating and Updating Database
+1. Create initial migration:
+dotnet ef migrations add InitialCreate
+
+2. Apply migrations to create/update database:
+dotnet ef database update
+
+### Common Commands
+1. Create new migration:
+dotnet ef migrations add <MigrationName>
+
+2. Remove last migration:
+dotnet ef migrations remove
+
+3. Apply migrations to create/update database:
+dotnet ef database update
+
+4. Revert last migration:
+dotnet ef database update <MigrationName>
+
+5. List all migrations:
+dotnet ef migrations list
+
+6. Script migration:
+dotnet ef migrations script
+
+7. Remove all migrations:
+dotnet ef migrations remove
+
+8. Drop database:
+dotnet ef database drop