feat(auditlog): per-script-execution correlation id on sync audit rows

src/ScadaLink.SiteRuntime/Scripts/AuditingDbCommand.cs

@@ -37,6 +37,7 @@ internal sealed class AuditingDbCommand : DbCommand
     private readonly string _siteId;
     private readonly string _instanceName;
     private readonly string? _sourceScript;
+    private readonly Guid _correlationId;
     private readonly ILogger _logger;
     private DbConnection? _wrappingConnection;
 
@@ -47,6 +48,7 @@ internal sealed class AuditingDbCommand : DbCommand
         string siteId,
         string instanceName,
         string? sourceScript,
+        Guid correlationId,
         ILogger logger)
     {
         _inner = inner ?? throw new ArgumentNullException(nameof(inner));
@@ -55,6 +57,7 @@ internal sealed class AuditingDbCommand : DbCommand
         _siteId = siteId ?? string.Empty;
         _instanceName = instanceName ?? string.Empty;
         _sourceScript = sourceScript;
+        _correlationId = correlationId;
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
     }
 
@@ -426,7 +429,9 @@ internal sealed class AuditingDbCommand : DbCommand
             OccurredAtUtc = DateTime.SpecifyKind(occurredAtUtc, DateTimeKind.Utc),
             Channel = AuditChannel.DbOutbound,
             Kind = AuditKind.DbWrite,
-            CorrelationId = null,
+            // Audit Log #23: the execution-wide correlation id, so all the
+            // sync ApiCall/DbWrite rows from one script run share an id.
+            CorrelationId = _correlationId,
             SourceSiteId = string.IsNullOrEmpty(_siteId) ? null : _siteId,
             SourceInstanceId = _instanceName,
             SourceScript = _sourceScript,