chore: refactor agent stats streaming (#5112)

coderd/database/queries/agentstats.sql

@@ -16,16 +16,17 @@ VALUES
 SELECT * FROM agent_stats WHERE agent_id = $1 ORDER BY created_at DESC LIMIT 1; 
 
 -- name: GetTemplateDAUs :many
-select
+SELECT 
 	(created_at at TIME ZONE 'UTC')::date as date,
 	user_id
-from
+FROM
 	agent_stats
-where template_id = $1
-group by
+WHERE
+	template_id = $1
+GROUP BY
 	date, user_id
-order by
-	date asc;
+ORDER BY
+	date ASC;
 
 -- name: DeleteOldAgentStats :exec
-DELETE FROM AGENT_STATS WHERE created_at  < now() - interval '30 days';
+DELETE FROM agent_stats WHERE created_at < NOW() - INTERVAL '30 days';