Refactor reports to share definitions across intervals

reports.yml

@@ -1,20 +1,18 @@
 - name: hits
-  interval: hourly
   label: Hits
   chart: bar
   query: |
-    SELECT strftime('%Y-%m-%d %H:00:00', datetime(time)) AS bucket,
+    SELECT {bucket} AS bucket,
            COUNT(*) AS value
     FROM logs
     GROUP BY bucket
     ORDER BY bucket
 
 - name: error_rate
-  interval: hourly
   label: Error Rate (%)
   chart: line
   query: |
-    SELECT strftime('%Y-%m-%d %H:00:00', datetime(time)) AS bucket,
+    SELECT {bucket} AS bucket,
            SUM(CASE WHEN status >= 500 THEN 1 ELSE 0 END) * 100.0 / COUNT(*) AS value
     FROM logs
     GROUP BY bucket