Colocated entity type configurations with entities

Added tenant entities and models
Modified db context

PostFundManagement.Domain/Entities/Portfolio.cs

@@ -1,6 +1,8 @@
+using static PostFundManagement.Domain.Extensions.Constants;
+
 namespace PostFundManagement.Domain.Entities;
 
-[EntityTypeConfiguration<Configuration.Entities.Portfolio, Portfolio>]
+[EntityTypeConfiguration<PortfolioConfiguration, Portfolio>]
 public class Portfolio : Models.Portfolio
 {
     public virtual User? Creator { get; set; }
@@ -11,3 +13,37 @@ public class Portfolio : Models.Portfolio
 
     public virtual ICollection<Programme> Programmes { get; set; } = [];
 }
+
+public sealed class PortfolioConfiguration : IEntityTypeConfiguration<Portfolio>
+{
+    public void Configure(EntityTypeBuilder<Portfolio> builder)
+    {
+        builder.ToTable(nameof(Portfolio).Pluralize());
+
+        builder.HasKey(pk => pk.Id);
+        builder.Property(f => f.OrganisationId).IsRequired();
+        builder.Property(f => f.CreatedBy).IsRequired();
+        builder.Property(f => f.OwnedBy).IsRequired();
+        builder.Property(f => f.CreatedAt).IsRequired().HasDefaultValueSql("now()");
+        builder.Property(f => f.Name).IsRequired().HasMaxLength(LabelLength);
+        builder.Property(f => f.Description).IsRequired(false).HasMaxLength(TextLength);
+
+        builder.HasOne(f => f.Organisation)
+            .WithMany()
+            .HasForeignKey(fk => fk.OrganisationId)
+            .IsRequired()
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasOne(f => f.Creator)
+            .WithMany()
+            .HasForeignKey(fk => fk.CreatedBy)
+            .IsRequired()
+            .OnDelete(DeleteBehavior.NoAction);
+
+        builder.HasOne(f => f.Owner)
+            .WithMany()
+            .HasForeignKey(fk => fk.OwnedBy)
+            .IsRequired()
+            .OnDelete(DeleteBehavior.NoAction);
+    }
+}