Stable multitenancy

PostFundManagement.Domain/Entities/TenantOrganisation.cs

@@ -1,6 +1,5 @@
 namespace PostFundManagement.Domain.Entities;
 
-[EntityTypeConfiguration<TenantOrganisationConfiguration, TenantOrganisation>]
 public class TenantOrganisation : Models.TenantOrganisation
 {
     public virtual Tenant? Tenant { get; set; }
@@ -17,6 +16,8 @@ public sealed class TenantOrganisationConfiguration : IEntityTypeConfiguration<T
         builder.ToTable(nameof(TenantOrganisation).Pluralize());
 
         builder.HasKey(pk => pk.Id);
+        builder.HasIndex(to => new { to.TenantId, to.OrganisationId }).IsUnique();
+
         builder.Property(f => f.CreatedAt).IsRequired().HasDefaultValueSql("now()");
         builder.Property(f => f.CreatedBy).IsRequired();
         builder.Property(f => f.TenantId).IsRequired();