JS: add extraction metrics to the dbscheme

javascript/ql/src/semmlecode.javascript.dbscheme

@@ -1136,3 +1136,32 @@ configLocations(
 );
 
 @configLocatable = @config | @configName | @configValue;
+
+/**
+ * The time taken for the extraction of a file.
+ * This table contains non-deternistic content.
+ *
+ * The sum of the `time` column for each (`file`, `timerKind`) pair
+ * is the total time taken for extraction of `file`.  The `extractionPhase`
+ * column provides a granular view of the extraction time of the file.
+ */
+extraction_time(
+   int file : @file ref,
+   // see `com.semmle.js.extractor.ExtractionMetrics.ExtractionPhase`.
+   int extractionPhase: int ref,
+   // 0 for the elapsed CPU time in nanoseconds, 1 for the wall elapsed wallclock time in nanoseconds
+   int timerKind: int ref,
+   float time: float ref
+)
+
+/**
+ * Non-timing related data for the extraction of a single file.
+ * This table contains non-deternistic content.
+ */
+extraction_data(
+   int file : @file ref,
+   // the absolute path to the cache file
+   varchar(900) cacheFile: string ref,
+   boolean fromCache: boolean ref,
+   int length: int ref
+)