Enhance query performance by applying AsSplitQuery to multiple handlers and loaders for Channels and ScheduleTemplates, improving efficiency in data retrieval and reducing unnecessary data duplication in queries.

backend/src/TeleWave.Application/Broadcast/Bumpers/AddBumperTextVariantCommandHandler.cs

@@ -16,6 +16,7 @@ public sealed class AddBumperTextVariantCommandHandler(IAppDbContext dbContext)
         var channel = await dbContext
             .Channels.Include(c => c.BumperTemplates)
                 .ThenInclude(t => t.Variants)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(c => c.Id == command.ChannelId, cancellationToken);
         if (channel is null)
             return Result.Failure<Guid>(ChannelErrors.NotFound);

backend/src/TeleWave.Application/Broadcast/Bumpers/BumperSpecLoader.cs

@@ -42,6 +42,7 @@ public sealed class BumperSpecLoader(
             .Channels.AsNoTracking()
             .Include(c => c.BumperTemplates)
                 .ThenInclude(t => t.Variants)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(c => c.Id == cache.ChannelId, cancellationToken);
         var template = channel?.BumperTemplates.FirstOrDefault(t => t.Id == cache.TemplateId);
         var variant = template?.Variants.FirstOrDefault(v => v.Id == cache.VariantId);

backend/src/TeleWave.Application/Broadcast/Bumpers/RemoveBumperTextVariantCommandHandler.cs

@@ -16,6 +16,7 @@ public sealed class RemoveBumperTextVariantCommandHandler(IAppDbContext dbContex
         var channel = await dbContext
             .Channels.Include(c => c.BumperTemplates)
                 .ThenInclude(t => t.Variants)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(c => c.Id == command.ChannelId, cancellationToken);
         if (channel is null)
             return Result.Failure(ChannelErrors.NotFound);

backend/src/TeleWave.Application/Broadcast/Bumpers/RenderBumperPreviewCommandHandler.cs

@@ -33,6 +33,7 @@ public sealed class RenderBumperPreviewCommandHandler(
             .Channels.AsNoTracking()
             .Include(c => c.BumperTemplates)
                 .ThenInclude(t => t.Variants)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(c => c.Id == query.ChannelId, cancellationToken);
         if (channel is null)
             return Result.Failure(ChannelErrors.NotFound);

backend/src/TeleWave.Application/Broadcast/Bumpers/UpdateBumperTextVariantCommandHandler.cs

@@ -16,6 +16,7 @@ public sealed class UpdateBumperTextVariantCommandHandler(IAppDbContext dbContex
         var channel = await dbContext
             .Channels.Include(c => c.BumperTemplates)
                 .ThenInclude(t => t.Variants)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(c => c.Id == command.ChannelId, cancellationToken);
         if (channel is null)
             return Result.Failure(ChannelErrors.NotFound);

backend/src/TeleWave.Application/Broadcast/GetChannel/GetChannelQueryHandler.cs

@@ -19,6 +19,7 @@ public sealed class GetChannelQueryHandler(IAppDbContext dbContext)
             .Channels.AsNoTracking()
             .Include(c => c.BumperTemplates)
                 .ThenInclude(t => t.Variants)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(c => c.Id == query.Id, cancellationToken);
         if (channel is null)
             return Result.Failure<ChannelDto>(ChannelErrors.NotFound);

backend/src/TeleWave.Application/Library/GetShow/GetShowQueryHandler.cs

@@ -18,6 +18,8 @@ public sealed class GetShowQueryHandler(IAppDbContext dbContext)
             .Shows.AsNoTracking()
             .Include(s => s.Episodes)
             .Include(s => s.Genres)
+            // Сиблинги: серии × жанры перемножились бы в одном запросе (см. ListShowsQueryHandler).
+            .AsSplitQuery()
             .FirstOrDefaultAsync(s => s.Id == query.Id, cancellationToken);
         if (show is null)
             return Result.Failure<ShowDto>(ShowErrors.NotFound);

backend/src/TeleWave.Application/Library/ListShows/ListShowsQueryHandler.cs

@@ -17,6 +17,9 @@ public sealed class ListShowsQueryHandler(IAppDbContext dbContext)
             .Shows.AsNoTracking()
             .Include(s => s.Episodes)
             .Include(s => s.Genres)
+            // Серии и жанры — сиблинги: одним запросом это честное перемножение (сериал на 200 серий
+            // с тремя жанрами даёт 600 строк вместо 203). Разделяем.
+            .AsSplitQuery()
             .Where(s =>
                 query.Interstitials
                     ? s.Kind == ShowKind.Interstitial

backend/src/TeleWave.Application/Programming/Planning/GridScheduleGenerator.cs

@@ -60,6 +60,10 @@ public sealed class GridScheduleGenerator(
         var channel = await dbContext
             .Channels.Include(c => c.BumperTemplates)
                 .ThenInclude(t => t.Variants)
+            // Вложенные коллекции тянем отдельными запросами: иначе колонки родителя (у шаблона —
+            // jsonb с правилами, у слоя — jsonb применимости) приезжают по копии на каждую строку
+            // листа. Тик планировщика повторяет эти два запроса на каждый канал.
+            .AsSplitQuery()
             .FirstOrDefaultAsync(c => c.Id == channelId, cancellationToken);
         if (channel is null || !channel.IsEnabled || channel.TemplateId is null)
             return new GenerationReport(0, [], ChannelSkipped: true);
@@ -70,6 +74,7 @@ public sealed class GridScheduleGenerator(
         var template = await dbContext
             .ScheduleTemplates.Include(t => t.Layers)
                 .ThenInclude(l => l.Slots)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(t => t.Id == channel.TemplateId, cancellationToken);
         if (template is null)
             return new GenerationReport(0, [], ChannelSkipped: true);
@@ -174,6 +179,7 @@ public sealed class GridScheduleGenerator(
             .Channels.AsNoTracking()
             .Include(c => c.BumperTemplates)
                 .ThenInclude(t => t.Variants)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(c => c.Id == channelId, cancellationToken);
         if (channel is null || channel.TemplateId is null)
             return null;
@@ -182,6 +188,7 @@ public sealed class GridScheduleGenerator(
             .ScheduleTemplates.AsNoTracking()
             .Include(t => t.Layers)
                 .ThenInclude(l => l.Slots)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(t => t.Id == channel.TemplateId, cancellationToken);
         if (template is null)
             return null;

backend/src/TeleWave.Application/Programming/Templates/CopyTemplate/CopyTemplateCommandHandler.cs

@@ -25,6 +25,7 @@ public sealed class CopyTemplateCommandHandler(IAppDbContext dbContext)
             .ScheduleTemplates.AsNoTracking()
             .Include(t => t.Layers)
                 .ThenInclude(l => l.Slots)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(t => t.ChannelId == command.SourceChannelId, cancellationToken);
         if (source is null)
             return Result.Failure<CopyTemplateResultDto>(ChannelErrors.TemplateNotFound);

backend/src/TeleWave.Application/Programming/Templates/GetTemplate/GetChannelTemplateQueryHandler.cs

@@ -24,6 +24,7 @@ public sealed class GetChannelTemplateQueryHandler(IAppDbContext dbContext)
             .ScheduleTemplates.AsNoTracking()
             .Include(t => t.Layers)
                 .ThenInclude(l => l.Slots)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(t => t.ChannelId == channel.Id, cancellationToken);
         if (template is null)
             return Result.Failure<ScheduleTemplateDto>(ChannelErrors.TemplateNotFound);

backend/src/TeleWave.Application/Programming/Templates/Layers/LayerCommandHandlers.cs

@@ -109,6 +109,7 @@ internal static class LayerLoader
         dbContext
             .ScheduleTemplates.Include(t => t.Layers)
                 .ThenInclude(l => l.Slots)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(t => t.Id == templateId, cancellationToken);
 
     public static Task<ScheduleTemplate?> ByLayerAsync(
@@ -119,5 +120,6 @@ internal static class LayerLoader
         dbContext
             .ScheduleTemplates.Include(t => t.Layers)
                 .ThenInclude(l => l.Slots)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(t => t.Layers.Any(l => l.Id == layerId), cancellationToken);
 }

backend/src/TeleWave.Application/Programming/Templates/SlotWriter.cs

@@ -89,6 +89,7 @@ public sealed class SlotWriter(IAppDbContext dbContext)
         dbContext
             .ScheduleTemplates.Include(t => t.Layers)
                 .ThenInclude(l => l.Slots)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(t => t.Layers.Any(l => l.Id == layerId), cancellationToken);
 
     /// <summary>Загружает шаблон по слоту.</summary>
@@ -99,6 +100,7 @@ public sealed class SlotWriter(IAppDbContext dbContext)
         dbContext
             .ScheduleTemplates.Include(t => t.Layers)
                 .ThenInclude(l => l.Slots)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(
                 t => t.Layers.Any(l => l.Slots.Any(s => s.Id == slotId)),
                 cancellationToken

backend/src/TeleWave.Application/Programming/Templates/Validate/ValidateTemplateQueryHandler.cs

@@ -28,6 +28,7 @@ public sealed class ValidateTemplateQueryHandler(IAppDbContext dbContext)
             .ScheduleTemplates.AsNoTracking()
             .Include(t => t.Layers)
                 .ThenInclude(l => l.Slots)
+            .AsSplitQuery()
             .FirstOrDefaultAsync(t => t.ChannelId == channel.Id, cancellationToken);
         if (template is null)
             return Result.Failure<IReadOnlyList<TemplateIssueDto>>(ChannelErrors.TemplateNotFound);