Update scheduling parameters and refactor channel endpoints: extend HorizonDays to 7 and RetentionDays to 90 in appsettings.json. Consolidate channel-related endpoint logic by removing obsolete files and enhancing the ShowEndpoints with audience and genre management capabilities. Improve error handling and streamline command handlers for channel operations.

backend/src/TeleWave.Infrastructure/Persistence/Configurations/GenreConfiguration.cs

@@ -0,0 +1,50 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using TeleWave.Domain.Library;
+
+namespace TeleWave.Infrastructure.Persistence.Configurations;
+
+public class GenreConfiguration : IEntityTypeConfiguration<Genre>
+{
+    public void Configure(EntityTypeBuilder<Genre> builder)
+    {
+        builder.Property(x => x.Name).IsRequired().HasMaxLength(128);
+        builder.Property(x => x.Slug).IsRequired().HasMaxLength(64);
+        builder.HasIndex(x => x.Slug).IsUnique();
+
+        builder
+            .HasMany(x => x.Aliases)
+            .WithOne()
+            .HasForeignKey(a => a.GenreId)
+            .OnDelete(DeleteBehavior.Cascade);
+        builder.Navigation(x => x.Aliases).UsePropertyAccessMode(PropertyAccessMode.Field);
+    }
+}
+
+public class GenreAliasConfiguration : IEntityTypeConfiguration<GenreAlias>
+{
+    public void Configure(EntityTypeBuilder<GenreAlias> builder)
+    {
+        builder.Property(x => x.Value).IsRequired().HasMaxLength(128);
+        // Псевдоним однозначно указывает на жанр: иначе сопоставление метаданных стало бы неопределённым.
+        builder.HasIndex(x => x.Value).IsUnique();
+    }
+}
+
+public class ShowGenreConfiguration : IEntityTypeConfiguration<ShowGenre>
+{
+    public void Configure(EntityTypeBuilder<ShowGenre> builder)
+    {
+        builder.HasKey(x => new { x.ShowId, x.GenreId });
+        builder.HasIndex(x => x.GenreId);
+
+        // Restrict, а не Cascade: удаление жанра из справочника не должно молча снимать его со всех шоу.
+        // Команда удаления проверяет использование заранее и возвращает управляемый конфликт.
+        builder
+            .HasOne<Genre>()
+            .WithMany()
+            .HasForeignKey(x => x.GenreId)
+            .OnDelete(DeleteBehavior.Restrict);
+    }
+}