Merge pull request #20555 from michaelnebel/csharp/staridlocationsbuildless

C#: `*` on Source locations in BMN.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CSharp/Entities/Locations/NonGeneratedSourceLocation.cs

@@ -40,8 +40,29 @@ public File FileEntity
             get;
         }
 
+        private static void WriteStarId(EscapingTextWriter writer)
+        {
+            writer.Write('*');
+        }
+
+        public sealed override void WriteQuotedId(EscapingTextWriter writer)
+        {
+            if (Context.ExtractionContext.IsStandalone)
+            {
+                WriteStarId(writer);
+                return;
+            }
+            base.WriteQuotedId(writer);
+        }
+
         public override void WriteId(EscapingTextWriter trapFile)
         {
+            if (Context.ExtractionContext.IsStandalone)
+            {
+                WriteStarId(trapFile);
+                return;
+            }
+
             trapFile.Write("loc,");
             trapFile.WriteSubId(FileEntity);
             trapFile.Write(',');

csharp/ql/lib/change-notes/2025-10-10-starid-locations.md

@@ -0,0 +1,4 @@
+---
+category: minorAnalysis
+---
+* The extraction of location information for source code entities has been updated to use star IDs (`*` IDs). This change should be transparent to end-users but may improve extraction performance in some cases by reducing TRAP file size and eliminating overhead from location de-duplication.