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

feat(emailer): add Postmark and Resend providers

backend/Modules/Memberships/Data/MembershipsDbContext.cs

@@ -0,0 +1,36 @@
+namespace Hutopy.Modules.Memberships.Data;
+
+public sealed class MembershipsDbContext(
+    DbContextOptions<MembershipsDbContext> options)
+    : DbContext(options)
+{
+    public const string SchemaName = "Memberships";
+
+    public DbSet<MembershipTier> MembershipTiers => Set<MembershipTier>();
+    public DbSet<Membership> Memberships => Set<Membership>();
+    public DbSet<Payment> Payments => Set<Payment>();
+    
+    
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.HasDefaultSchema(SchemaName);
+
+        modelBuilder
+            .Entity<MembershipTier>()
+            .Property(c => c.CreatedAt)
+            .ValueGeneratedOnAdd()
+            .HasDefaultValueSql("CURRENT_TIMESTAMP");
+        
+        modelBuilder
+            .Entity<Membership>()
+            .Property(c => c.CreatedAt)
+            .ValueGeneratedOnAdd()
+            .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+        modelBuilder
+            .Entity<Payment>()
+            .Property(c => c.CreatedAt)
+            .ValueGeneratedOnAdd()
+            .HasDefaultValueSql("CURRENT_TIMESTAMP");
+    }
+}