Разбить Infrastructure и корень Deal.Api по назначению

Integrations -> Abstractions/Exceptions/Extensions/Models/Options/
Services (включая Storage); Persistence-конфигурации -> Configurations;
корень Deal.Api (оркестратор/планировщики/DTO) -> Services/Dtos.
namespace приведён к путям, using добавлены/дедуплицированы, FQN
обновлены.

src/core/Deal.Infrastructure/Persistence/Configurations/TokenUsageEventConfiguration.cs

@@ -0,0 +1,38 @@
+using Deal.Infrastructure.Persistence.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using Deal.Infrastructure.Persistence;
+using Deal.Infrastructure.Persistence.Configurations;
+
+namespace Deal.Infrastructure.Persistence.Configurations;
+
+/// <summary>
+/// EF-конфигурация события расхода токенов: таблица token_usage_events в схеме public (append-only).
+/// </summary>
+public sealed class TokenUsageEventConfiguration : IEntityTypeConfiguration<TokenUsageEventEntity>
+{
+    public void Configure(EntityTypeBuilder<TokenUsageEventEntity> builder)
+    {
+        builder.ToTable("token_usage_events", "public");
+
+        builder.HasKey(x => x.Id);
+
+        builder.Property(x => x.TenantId).IsRequired();
+        builder.Property(x => x.At).IsRequired();
+        builder.Property(x => x.Provider).IsRequired();
+        builder.Property(x => x.Model).IsRequired();
+        builder.Property(x => x.Kind).IsRequired();
+        builder.Property(x => x.PromptTokens).IsRequired();
+        builder.Property(x => x.CompletionTokens).IsRequired();
+        builder.Property(x => x.TotalTokens).IsRequired();
+        builder.Property(x => x.DetailJson).HasColumnType("text");
+
+        builder.HasIndex(x => new { x.TenantId, x.At });
+        builder.HasIndex(x => x.At);
+
+        builder.HasOne<TenantEntity>()
+            .WithMany()
+            .HasForeignKey(x => x.TenantId)
+            .OnDelete(DeleteBehavior.Restrict);
+    }
+}