Added summary stats query.

lib/db.js

@@ -179,3 +179,33 @@ export async function getPageviewData(
     ),
   );
 }
+
+export async function getSummary(website_id, start_at, end_at) {
+  return runQuery(
+    prisma.queryRaw(
+      `
+      select
+         (select count(*)
+            from pageview
+            where website_id=${website_id}
+            and created_at between '${start_at}' and '${end_at}'
+          ) as "pageviews",
+         (select
+            count(distinct session_id)
+            from pageview
+            where website_id=${website_id}
+            and created_at between '${start_at}' and '${end_at}'
+         ) as "uniques",
+         (select sum(t.c) from
+           (select count(*) c
+              from pageview
+              where website_id=${website_id}
+              and created_at between '${start_at}' and '${end_at}'
+              group by session_id
+              having count(*) = 1
+          ) t
+         ) as "bounces"
+      `,
+    ),
+  );
+}