[ec] Fix for small bug in tracking running totals.

Fix for a bug where the running totals for the first day a page was
visited were being counted twice.  ie:

If on day 1, a given dataset page is visited by 2 distinct users,
then the count for that day will be 2, but both running total columns
will show 4.  This doubling only occurs on the first day: subsequent
days' running totals will still be out-by-N (where N is the error on the
first day), but not continue to double

ckan/lib/cli.py

@@ -963,33 +963,33 @@ def update_tracking(self, engine, summary_date):
         # update summary totals for resources
         sql = '''UPDATE tracking_summary t1
                  SET running_total = (
-                    SELECT sum(count)
+                    SELECT COALESCE(sum(count), 0)
                     FROM tracking_summary t2
                     WHERE t1.url = t2.url
-                    AND t2.tracking_date <= t1.tracking_date
+                    AND t2.tracking_date < t1.tracking_date
                  ) + t1.count
                  ,recent_views = (
-                    SELECT sum(count)
+                    SELECT COALESCE(sum(count), 0)
                     FROM tracking_summary t2
                     WHERE t1.url = t2.url
-                    AND t2.tracking_date <= t1.tracking_date AND t2.tracking_date >= t1.tracking_date - 14
+                    AND t2.tracking_date < t1.tracking_date AND t2.tracking_date >= t1.tracking_date - 14
                  ) + t1.count
                  WHERE t1.running_total = 0 AND tracking_type = 'resource';'''
         engine.execute(sql)
 
         # update summary totals for pages
         sql = '''UPDATE tracking_summary t1
                  SET running_total = (
-                    SELECT sum(count)
+                    SELECT COALESCE(sum(count), 0)
                     FROM tracking_summary t2
                     WHERE t1.package_id = t2.package_id
-                    AND t2.tracking_date <= t1.tracking_date
+                    AND t2.tracking_date < t1.tracking_date
                  ) + t1.count
                  ,recent_views = (
-                    SELECT sum(count)
+                    SELECT COALESCE(sum(count), 0)
                     FROM tracking_summary t2
                     WHERE t1.package_id = t2.package_id
-                    AND t2.tracking_date <= t1.tracking_date AND t2.tracking_date >= t1.tracking_date - 14
+                    AND t2.tracking_date < t1.tracking_date AND t2.tracking_date >= t1.tracking_date - 14
                  ) + t1.count
                  WHERE t1.running_total = 0 AND tracking_type = 'page'
                  AND t1.package_id IS NOT NULL