Improves realtime top stats and conversion rate calculation (#500)

* Fixes goal conversion rate when period is realtime

* Adds unique visitors (30m) to realtime top stats

* Changelog

Co-authored-by: Uku Taht <Uku.taht@gmail.com>

CHANGELOG.md

@@ -11,6 +11,7 @@ All notable changes to this project will be documented in this file.
 - Simple notifications around traffic spikes plausible/analytics#453
 - Dark theme option/system setting follow plausible/analytics#467
 - "Load More" capability to pages modal plausible/analytics#480
+- Unique Visitors (last 30 min) as a top stat in realtime view plausible/analytics#500
 - Pinned filter and date selector rows while scrolling plausible/analytics#472
 
 ### Changed
@@ -33,6 +34,7 @@ All notable changes to this project will be documented in this file.
 - Prevent picking dates before site insertion plausible/analtics#446
 - Fix overly-sticky from and to in query parameters plausible/analytics#495
 - Adds support for single-day date selection plausible/analytics#495
+- Goal conversion rate in realtime view is now accurate plausible/analytics#500
 
 ### Security
 - Do not run the plausible Docker container as root plausible/analytics#362

lib/plausible/stats/clickhouse.ex

@@ -166,6 +166,7 @@ defmodule Plausible.Stats.Clickhouse do
   end
 
   def unique_visitors(site, query) do
+    query = if query.period == "realtime", do: %Query{query | period: "30m"}, else: query
     ClickhouseRepo.one(
       from e in base_query_w_sessions(site, query),
         select: fragment("uniq(user_id)")

lib/plausible_web/controllers/api/stats_controller.ex

@@ -28,6 +28,10 @@ defmodule PlausibleWeb.Api.StatsController do
         name: "Current visitors",
         count: Stats.current_visitors(site, query)
       },
+      %{
+        name: "Unique visitors (last 30 min)",
+        count: Stats.unique_visitors(site, query)
+      },
       %{
         name: "Pageviews (last 30 min)",
         count: Stats.total_pageviews(site, query)