feature: add analytics session lenght data to view (#2550)

- Found that it wasn't possible to replicate the ["Average time spent"](https://metabase.editor.planx.uk/question/15-average-time-spent?flow_id=0e9d79ec-9cf3-497d-a1a1-8e70469bb52d) card without analytics session length data
- Add analytics.ended_at to the view
- Add time_spent_on_analytics_session_in_minutes to the view

hasura.planx.uk/migrations/1702312905340_alter_view_analytics_summary_add_analytics_session_length_data/down.sql

@@ -0,0 +1,24 @@
+DROP VIEW public.analytics_summary CASCADE;
+
+CREATE OR REPLACE VIEW public.analytics_summary AS 
+select 
+	a.id as analytics_id,
+	al.id as analytics_log_id,
+	f.slug as service_slug,
+	t.slug as team_slug,
+	a.type as analytics_type,
+	a.created_at as analytics_created_at,
+	user_agent,
+	referrer,
+	flow_direction,
+	metadata,
+	al.user_exit as is_user_exit,
+	node_type,
+	node_title,
+	has_clicked_help,
+	input_errors,
+	CAST(EXTRACT(EPOCH FROM (al.next_log_created_at - al.created_at)) as numeric (10, 1)) as time_spent_on_node_seconds
+from analytics a
+	left join analytics_logs al on a.id = al.analytics_id
+	left join flows f on a.flow_id = f.id
+	left join teams t on t.id = f.team_id;

hasura.planx.uk/migrations/1702312905340_alter_view_analytics_summary_add_analytics_session_length_data/up.sql

@@ -0,0 +1,24 @@
+CREATE OR REPLACE VIEW public.analytics_summary AS 
+select 
+	a.id as analytics_id,
+	al.id as analytics_log_id,
+	f.slug as service_slug,
+	t.slug as team_slug,
+	a.type as analytics_type,
+	a.created_at as analytics_created_at,
+	user_agent,
+	referrer,
+	flow_direction,
+	metadata,
+	al.user_exit as is_user_exit,
+	node_type,
+	node_title,
+	has_clicked_help,
+	input_errors,
+	CAST(EXTRACT(EPOCH FROM (al.next_log_created_at - al.created_at)) as numeric (10, 1)) as time_spent_on_node_seconds,
+	a.ended_at as analytics_ended_at,
+	CAST(EXTRACT(EPOCH FROM (a.ended_at - a.created_at))/60 as numeric (10, 1)) as time_spent_on_analytics_session_minutes
+from analytics a
+	left join analytics_logs al on a.id = al.analytics_id
+	left join flows f on a.flow_id = f.id
+	left join teams t on t.id = f.team_id;