Dashboard fixes: staleness, toner, layout

plugins/backups/services/staleness.py

@@ -65,10 +65,14 @@ def stalechains(days=None, limit=50):
 
     rows = []
     for revision in latestperchain().values():
-        # Rows written before lastseenat existed fall back to the timestamps
-        # that do exist, so an old install reports something sane on day one
-        # rather than every chain at once.
-        seen = revision.lastseenat or revision.collectedat or revision.createdat
+        # NULL means never confirmed since the column existed, and it is NOT
+        # substituted with collectedat. That substitution is what the first
+        # version did, and on a real fleet it reported every machine whose
+        # config had simply been stable for months as a stopped backup - the
+        # whole board lit up and said the site was broken when it was fine.
+        # A chain becomes measurable the first time its PC posts; until then
+        # this card says nothing about it, which is the truth.
+        seen = revision.lastseenat
         if seen is None or seen >= cutoff:
             continue
         asset = db.session.get(Asset, revision.assetid)