ql-for-ql: Regenerate dbscheme

ql/ql/src/ql.dbscheme

@@ -1,5 +1,6 @@
 // CodeQL database schema for QL
 // Automatically generated from the tree-sitter grammar; do not edit
+// To regenerate, run 'scripts/create-extractor-pack.sh' in ql/
 
 /*- Files and folders -*/
 
@@ -109,11 +110,23 @@ yaml_locations(unique int locatable: @yaml_locatable ref,
 @yaml_locatable = @yaml_node | @yaml_error;
 
 /*- Database metadata -*/
+
+/**
+ * The CLI will automatically emit applicable tuples for this table,
+ * such as `databaseMetadata("isOverlay", "true")` when building an
+ * overlay database.
+ */
 databaseMetadata(
   string metadataKey: string ref,
   string value: string ref
 );
 
+/*- Overlay support -*/
+
+/**
+ * The CLI will automatically emit tuples for each new/modified/deleted file
+ * when building an overlay database.
+ */
 overlayChangedFiles(
   string path: string ref
 );