many fixes and improvements - rework for modules/ and common/

feat(emailer): add Postmark and Resend providers

backend/Modules/Creators/Data/CreatorsDbContext.cs

@@ -0,0 +1,46 @@
+namespace Hutopy.Modules.Creators.Data;
+
+public class CreatorsDbContext(
+    DbContextOptions<CreatorsDbContext> options)
+    : DbContext(options)
+{
+    public const string SchemaName = "Creators";
+
+    public DbSet<Creator> Creators => Set<Creator>();
+    public DbSet<Slugs> Slugs => Set<Slugs>();
+
+    protected override void OnModelCreating(
+        ModelBuilder modelBuilder)
+    {
+        modelBuilder.HasDefaultSchema(SchemaName);
+
+        modelBuilder
+            .Entity<Slugs>()
+            .Property(x => x.NormalizedName)
+            .HasComputedColumnSql("LOWER(\"Name\")", stored: true);
+
+        modelBuilder
+            .Entity<Slugs>()
+            .HasIndex(x => x.NormalizedName)
+            .IsUnique();
+
+        modelBuilder
+            .Entity<Creator>()
+            .Property(c => c.IsDeleted)
+            .HasComputedColumnSql("\"DeletedAt\" IS NOT NULL", stored: true); // bool
+
+        modelBuilder
+            .Entity<Creator>()
+            .OwnsOne<Socials>(x => x.Socials)
+            .ToTable(nameof(Socials));
+
+        modelBuilder
+            .Entity<Creator>()
+            .OwnsOne<Presentation>(x => x.Presentation)
+            .ToTable(nameof(Presentation));
+        
+        modelBuilder
+            .Entity<Creator>()
+            .HasQueryFilter(c => !c.IsDeleted);
+    }
+}