Fixes #10879 - improved reports widget performance

app/helpers/dashboard_helper.rb

@@ -59,8 +59,8 @@ def searchable_links(name, search, counter)
   end
 
   def latest_events
-    # 6 reports + header fits the events box nicely...
-    Report.authorized(:view_reports).my_reports.interesting.search_for('reported > "7 days ago"').limit(6).includes(:host)
+    # scoped_search generates unoptimized query until this is fixed: https://github.com/wvanbergen/scoped_search/pull/132
+    Report.authorized(:view_reports).my_reports.interesting.where("reported_at > ?", 7.days.ago).order("reported_at DESC").limit(6).includes(:host)
   end
 
   def translated_header(shortname, longname)

db/migrate/20150622090115_change_reported_at.rb

@@ -0,0 +1,10 @@
+class ChangeReportedAt < ActiveRecord::Migration
+  def up
+    Report.where(:reported_at => nil).update_all(:reported_at => Time.at(0))
+    change_column :reports, :reported_at, :datetime, :null => false
+  end
+
+  def down
+    change_column :reports, :reported_at, :datetime, :null => true
+  end
+end