feat(configdb): map AuditEvent to AuditLog table with PK and five named indexes (#23)

src/ScadaLink.ConfigurationDatabase/Configurations/AuditLogEntityTypeConfiguration.cs

@@ -0,0 +1,93 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using ScadaLink.Commons.Entities.Audit;
+
+namespace ScadaLink.ConfigurationDatabase.Configurations;
+
+/// <summary>
+/// Maps the <see cref="AuditEvent"/> record to the central <c>AuditLog</c> table
+/// described in alog.md §4. Column lengths/types and the five named indexes are
+/// fixed by that specification — keep this in sync with the doc.
+/// </summary>
+public class AuditLogEntityTypeConfiguration : IEntityTypeConfiguration<AuditEvent>
+{
+    public void Configure(EntityTypeBuilder<AuditEvent> builder)
+    {
+        builder.ToTable("AuditLog");
+
+        builder.HasKey(e => e.EventId);
+
+        // Enum-as-string columns: bounded varchar(32) ASCII.
+        builder.Property(e => e.Channel)
+            .HasConversion<string>()
+            .HasMaxLength(32)
+            .IsUnicode(false)
+            .IsRequired();
+
+        builder.Property(e => e.Kind)
+            .HasConversion<string>()
+            .HasMaxLength(32)
+            .IsUnicode(false)
+            .IsRequired();
+
+        builder.Property(e => e.Status)
+            .HasConversion<string>()
+            .HasMaxLength(32)
+            .IsUnicode(false)
+            .IsRequired();
+
+        builder.Property(e => e.ForwardState)
+            .HasConversion<string>()
+            .HasMaxLength(32)
+            .IsUnicode(false);
+
+        // Ascii identifier columns — never carry user-supplied unicode.
+        builder.Property(e => e.SourceSiteId)
+            .HasMaxLength(64)
+            .IsUnicode(false);
+
+        builder.Property(e => e.SourceInstanceId)
+            .HasMaxLength(128)
+            .IsUnicode(false);
+
+        builder.Property(e => e.SourceScript)
+            .HasMaxLength(128)
+            .IsUnicode(false);
+
+        builder.Property(e => e.Actor)
+            .HasMaxLength(128)
+            .IsUnicode(false);
+
+        builder.Property(e => e.Target)
+            .HasMaxLength(256)
+            .IsUnicode(false);
+
+        // Bounded unicode message column.
+        builder.Property(e => e.ErrorMessage)
+            .HasMaxLength(1024);
+
+        // ErrorDetail, RequestSummary, ResponseSummary, Extra: leave as nvarchar(max).
+
+        // Indexes — names locked to alog.md §4 for reconciliation/migration discoverability.
+        builder.HasIndex(e => e.OccurredAtUtc)
+            .IsDescending(true)
+            .HasDatabaseName("IX_AuditLog_OccurredAtUtc");
+
+        builder.HasIndex(e => new { e.SourceSiteId, e.OccurredAtUtc })
+            .IsDescending(false, true)
+            .HasDatabaseName("IX_AuditLog_Site_Occurred");
+
+        builder.HasIndex(e => e.CorrelationId)
+            .HasFilter("[CorrelationId] IS NOT NULL")
+            .HasDatabaseName("IX_AuditLog_CorrelationId");
+
+        builder.HasIndex(e => new { e.Channel, e.Status, e.OccurredAtUtc })
+            .IsDescending(false, false, true)
+            .HasDatabaseName("IX_AuditLog_Channel_Status_Occurred");
+
+        builder.HasIndex(e => new { e.Target, e.OccurredAtUtc })
+            .IsDescending(false, true)
+            .HasFilter("[Target] IS NOT NULL")
+            .HasDatabaseName("IX_AuditLog_Target_Occurred");
+    }
+}

src/ScadaLink.ConfigurationDatabase/ScadaLinkDbContext.cs

@@ -84,6 +84,7 @@ public class ScadaLinkDbContext : DbContext, IDataProtectionKeyContext
 
     // Audit
     public DbSet<AuditLogEntry> AuditLogEntries => Set<AuditLogEntry>();
+    public DbSet<AuditEvent> AuditLogs => Set<AuditEvent>();
 
     // Data Protection Keys (for shared ASP.NET Data Protection across nodes)
     public DbSet<DataProtectionKey> DataProtectionKeys => Set<DataProtectionKey>();