fix: filter session count sums by created_at (#6529)

Fixes the session totals being waaaaay too high!

coderd/database/queries.sql.go

@@ -5562,7 +5562,7 @@ WITH agent_stats AS (
 		coalesce(SUM(session_count_reconnecting_pty), 0)::bigint AS session_count_reconnecting_pty
 	 FROM (
 		SELECT id, created_at, user_id, agent_id, workspace_id, template_id, connections_by_proto, connection_count, rx_packets, rx_bytes, tx_packets, tx_bytes, connection_median_latency_ms, session_count_vscode, session_count_jetbrains, session_count_reconnecting_pty, session_count_ssh, ROW_NUMBER() OVER(PARTITION BY agent_id ORDER BY created_at DESC) AS rn
-		FROM workspace_agent_stats
+		FROM workspace_agent_stats WHERE created_at > $1
 	) AS a WHERE a.rn = 1
 )
 SELECT workspace_rx_bytes, workspace_tx_bytes, workspace_connection_latency_50, workspace_connection_latency_95, session_count_vscode, session_count_ssh, session_count_jetbrains, session_count_reconnecting_pty FROM agent_stats, latest_agent_stats

coderd/database/queries/workspaceagentstats.sql

@@ -70,7 +70,7 @@ WITH agent_stats AS (
 		coalesce(SUM(session_count_reconnecting_pty), 0)::bigint AS session_count_reconnecting_pty
 	 FROM (
 		SELECT *, ROW_NUMBER() OVER(PARTITION BY agent_id ORDER BY created_at DESC) AS rn
-		FROM workspace_agent_stats
+		FROM workspace_agent_stats WHERE created_at > $1
 	) AS a WHERE a.rn = 1
 )
 SELECT * FROM agent_stats, latest_agent_stats;