feat(bundles debug): add more bundle timestamps to debug output PE-4212

Adds 'MAX' of 'last' timestamps on 'bundles' to help diagnose where the
unbundling pipeline is getting stuck when there are issues.

src/database/sql/bundles/stats.sql

@@ -2,15 +2,19 @@
 SELECT
   COUNT(*) AS count,
   IFNULL(SUM(data_item_count), 0) AS data_item_count,
-  IFNULL(SUM(matched_data_item_count), 0) AS matched_data_item_count
+  IFNULL(SUM(matched_data_item_count), 0) AS matched_data_item_count,
+  IFNULL(MAX(last_queued_at), -1) AS max_queued_at,
+  IFNULL(MAX(last_skipped_at), -1) AS max_skipped_at,
+  IFNULL(MAX(last_unbundled_at), -1) AS max_unbundled_at,
+  IFNULL(MAX(last_fully_indexed_at), -1) AS max_fully_indexed_at
 FROM bundles
 
 -- selectDataItemStats
 SELECT
   SUM(data_item_count) AS data_item_count,
   SUM(nested_data_item_count) AS nested_data_item_count,
-  MAX(max_new_indexed_at) AS last_new_indexed_at,
-  MAX(max_stable_indexed_at) AS last_stable_indexed_at
+  MAX(max_new_indexed_at) AS max_new_indexed_at,
+  MAX(max_stable_indexed_at) AS max_stable_indexed_at
 FROM (
   SELECT
     COUNT(*) AS data_item_count,

src/database/standalone-sqlite.ts

@@ -322,6 +322,10 @@ type DebugInfo = {
   };
   timestamps: {
     now: number;
+    maxBundleQueuedAt: number;
+    maxBundleSkippedAt: number;
+    maxBundleUnbundledAt: number;
+    maxBundleFullyIndexedAt: number;
     maxStableDataItemIndexedAt: number;
     maxNewDataItemIndexedAt: number;
   };
@@ -946,8 +950,12 @@ export class StandaloneSqliteDatabaseWorker {
       },
       timestamps: {
         now: currentUnixTimestamp(),
-        maxNewDataItemIndexedAt: dataItemStats.last_new_indexed_at,
-        maxStableDataItemIndexedAt: dataItemStats.last_stable_indexed_at,
+        maxBundleQueuedAt: bundleStats.max_queued_at,
+        maxBundleSkippedAt: bundleStats.max_skipped_at,
+        maxBundleUnbundledAt: bundleStats.max_unbundled_at,
+        maxBundleFullyIndexedAt: bundleStats.max_fully_indexed_at,
+        maxNewDataItemIndexedAt: dataItemStats.max_new_indexed_at,
+        maxStableDataItemIndexedAt: dataItemStats.max_stable_indexed_at,
       },
     };
   }