diff --git a/README.md b/README.md
index 8c9b4cc..cf3219b 100644
--- a/README.md
+++ b/README.md
@@ -54,158 +54,6 @@ include `asn`. Unmapped countries use `ZZ`; unmapped ASNs use `0`.
 - `dnstt_bytes_out_total`
 - `dnstt_sessions_total`
 
-## Grafana Queries
-
-Use `$domain` as a Grafana variable for the DNSTT domain, for example
-`t2.bypasscensorship.org`. Replace `$__rate_interval` with a fixed range such
-as `5m` if you are not using Grafana's built-in interval variables.
-
-- Title: Current active clients
-- Description: Current number of active DNSTT sessions for the selected domain.
-- Visualization: Stat or gauge.
-
-```promql
-sum(dnstt_active_clients{domain="$domain"})
-```
-
-- Title: Peak active clients
-- Description: Highest active DNSTT session count observed since the exporter
-started.
-- Visualization: Stat.
-
-```promql
-sum(dnstt_peak_clients{domain="$domain"})
-```
-
-- Title: Active clients by country
-- Description: Current active DNSTT sessions grouped by resolver country.
-- Visualization: Geomap, bar chart, or table. 
-
-```promql
-sum by (country) (dnstt_active_clients{domain="$domain"})
-```
-
-- Title: Top countries by active clients
-- Description: Countries with the most active DNSTT sessions right now.
-- Visualization: Bar chart.
-
-```promql
-topk(10, sum by (country) (dnstt_active_clients{domain="$domain"}))
-```
-
-- Title: Active clients by ASN
-- Description: Current active DNSTT sessions grouped by resolver ASN.
-- Visualization: Bar chart or table.
-
-```promql
-sum by (asn) (dnstt_active_clients{domain="$domain"})
-```
-
-- Title: Top ASNs by active clients
-- Description: Resolver ASNs with the most active DNSTT sessions right now.
-- Visualization: Bar chart.
-
-```promql
-topk(10, sum by (asn) (dnstt_active_clients{domain="$domain"}))
-```
-
-- Title: Active clients by country and ASN
-- Description: Current active DNSTT sessions split by both resolver country and
-resolver ASN.
-- Visualization: Table.
-
-```promql
-sum by (country, asn) (dnstt_active_clients{domain="$domain"})
-```
-
-- Title: Top country/ASN pairs by active clients
-- Description: Country and ASN combinations with the most active DNSTT sessions
-right now.
-- Visualization: Bar chart or table.
-
-```promql
-topk(20, sum by (country, asn) (dnstt_active_clients{domain="$domain"}))
-```
-
-- Title: DNS query rate
-- Description: Total observed DNSTT DNS queries per second for the selected
-domain.
-- Visualization: Time series.
-
-```promql
-sum(rate(dnstt_queries_total{domain="$domain"}[$__rate_interval]))
-```
-
-- Title: DNS query rate by country
-- Description: Observed DNSTT DNS queries per second grouped by resolver country.
-- Visualization: Stacked time series or bar chart. Use stacked time series for
-trends over time, and bar chart for current top countries.
-
-```promql
-sum by (country) (rate(dnstt_queries_total{domain="$domain"}[$__rate_interval]))
-```
-
-- Title: Top ASNs by DNS query rate
-- Description: Resolver ASNs producing the highest DNSTT DNS query rates.
-- Visualization: Bar chart.
-
-```promql
-topk(10, sum by (asn) (rate(dnstt_queries_total{domain="$domain"}[$__rate_interval])))
-```
-
-- Title: Inbound DNS traffic rate
-- Description: Bytes per second received in DNSTT DNS queries.
-- Visualization: Time series.
-
-```promql
-sum(rate(dnstt_bytes_in_total{domain="$domain"}[$__rate_interval]))
-```
-
-- Title: Outbound DNS traffic rate
-- Description: Bytes per second sent in DNSTT DNS responses.
-- Visualization: Time series.
-
-```promql
-sum(rate(dnstt_bytes_out_total{domain="$domain"}[$__rate_interval]))
-```
-
-- Title: DNS traffic rate by country
-- Description: Combined inbound and outbound DNSTT DNS bytes per second grouped
-by resolver country.
-- Visualization: Geomap, stacked time series, or bar chart.
-
-```promql
-sum by (country) (
-  rate(dnstt_bytes_in_total{domain="$domain"}[$__rate_interval])
-  +
-  rate(dnstt_bytes_out_total{domain="$domain"}[$__rate_interval])
-)
-```
-
-- Title: Total observed sessions
-- Description: Total unique DNSTT sessions observed since the exporter started.
-- Visualization: Stat.
-
-```promql
-sum(dnstt_sessions_total{domain="$domain"})
-```
-
-- Title: New session rate
-- Description: New DNSTT sessions observed per second.
-- Visualization: Time series.
-
-```promql
-sum(rate(dnstt_sessions_total{domain="$domain"}[$__rate_interval]))
-```
-
-- Title: New session rate by country
-- Description: New DNSTT sessions per second grouped by resolver country.
-- Visualization: Stacked time series, geomap, or bar chart.
-
-```promql
-sum by (country) (rate(dnstt_sessions_total{domain="$domain"}[$__rate_interval]))
-```
-
 ## Development
 
 ```sh
diff --git a/flake.lock b/flake.lock
index be257e5..24eab79 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1779622335,
-        "narHash": "sha256-ViA62qtL5za7V3d5I8OA9q9JcFhsVAiL5jVHwEclWqk=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "705e9929918b43bd7b715dc0a878ac870449bb03",
-        "type": "github"
+        "lastModified": 1777578337,
+        "narHash": "sha256-Ad49moKWeXtKBJNy2ebiTQUEgdLyvGmTeykAQ9xM+Z4=",
+        "rev": "15f4ee454b1dce334612fa6843b3e05cf546efab",
+        "revCount": 990025,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.990025%2Brev-15f4ee454b1dce334612fa6843b3e05cf546efab/019de756-85a1-7400-84a3-d277a7ed191b/source.tar.gz"
       },
       "original": {
-        "owner": "nixos",
-        "ref": "nixos-26.05",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1"
       }
     },
     "root": {
diff --git a/flake.nix b/flake.nix
index ca0eb0b..af586d9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,5 +1,5 @@
 {
-  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-26.05";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1";
   outputs =
     { self, nixpkgs }:
     let
diff --git a/internal/dnstt/collector.go b/internal/dnstt/collector.go
index 175b712..4928c16 100644
--- a/internal/dnstt/collector.go
+++ b/internal/dnstt/collector.go
@@ -167,12 +167,9 @@ func (c *Collector) RecordQueryFrom(domain string, clientID string, resolverIP n
 
 	now := c.now()
 	client, exists := tunnel.clients[clientID]
-	updatePeak := !exists
 	if !exists {
 		client = &clientState{firstSeen: now, firstKey: key}
 		tunnel.clients[clientID] = client
-	} else if now.Sub(client.lastSeen) >= ClientTimeout || client.lastKey != key {
-		updatePeak = true
 	}
 	client.lastSeen = now
 	client.lastKey = key
@@ -181,9 +178,7 @@ func (c *Collector) RecordQueryFrom(domain string, clientID string, resolverIP n
 		client.bytesIn += uint64(size)
 	}
 
-	if updatePeak {
-		updatePeaks(tunnel, now)
-	}
+	updatePeaks(tunnel, now)
 }
 
 // RecordResponse records an observed DNSTT DNS response.
@@ -216,6 +211,7 @@ func (c *Collector) Snapshot() Snapshot {
 	snapshot := Snapshot{Tunnels: make(map[string]TunnelSnapshot, len(c.tunnels))}
 	for _, domain := range c.domains {
 		tunnel := c.tunnels[domain]
+		updatePeaks(tunnel, now)
 		series := c.seriesSnapshotsLocked(domain, tunnel, now)
 
 		tunnelSnapshot := TunnelSnapshot{Domain: domain, Series: series}
diff --git a/internal/dnstt/collector_test.go b/internal/dnstt/collector_test.go
index 8f31044..d46c923 100644
--- a/internal/dnstt/collector_test.go
+++ b/internal/dnstt/collector_test.go
@@ -1,7 +1,6 @@
 package dnstt
 
 import (
-	"net/netip"
 	"testing"
 	"time"
 )
@@ -60,36 +59,3 @@ func TestCollectorMatchesSubdomainsToRegisteredTunnel(t *testing.T) {
 		t.Fatalf("active clients = %d, want 1", tunnel.ActiveClients)
 	}
 }
-
-func TestCollectorUpdatesPeakWhenActiveClientChangesGeoKey(t *testing.T) {
-	now := time.Unix(1000, 0)
-	firstResolver := netip.MustParseAddr("192.0.2.53")
-	secondResolver := netip.MustParseAddr("198.51.100.53")
-	c := NewCollector(
-		[]string{"tunnel.example.com"},
-		WithNow(func() time.Time { return now }),
-		WithGeoResolver(fakeGeoResolver{
-			labelNames: []string{"asn"},
-			labels: map[netip.Addr]GeoLabels{
-				firstResolver:  {ASN: "64500"},
-				secondResolver: {ASN: "64501"},
-			},
-		}),
-	)
-
-	c.RecordQueryFrom("tunnel.example.com", "client-a", firstResolver, 120)
-	c.RecordQueryFrom("tunnel.example.com", "client-a", secondResolver, 120)
-
-	foundChangedASN := false
-	for _, series := range c.Snapshot().Tunnels["tunnel.example.com"].Series {
-		if series.ASN == "64501" && series.PeakClients != 1 {
-			t.Fatalf("peak clients for changed ASN = %d, want 1", series.PeakClients)
-		}
-		if series.ASN == "64501" {
-			foundChangedASN = true
-		}
-	}
-	if !foundChangedASN {
-		t.Fatal("series for changed ASN not found")
-	}
-}