diff --git a/CHANGELOG.md b/CHANGELOG.md
index b0217467..17fc8905 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# v3.1.1
+
+## What's Changed
+
+* Fixed crash caused by concurrent writes under high load ([#684](https://github.com/selfhst/icons/issues/684))
+* Suppress favicon error log message when viewing icons directly from a browser
+
 # v3.1.0
 
 ## What's Changed
diff --git a/avif/harbor-scale-dark.avif b/avif/harbor-scale-dark.avif
new file mode 100644
index 00000000..356c6f93
Binary files /dev/null and b/avif/harbor-scale-dark.avif differ
diff --git a/avif/harbor-scale-light.avif b/avif/harbor-scale-light.avif
new file mode 100644
index 00000000..10378bf9
Binary files /dev/null and b/avif/harbor-scale-light.avif differ
diff --git a/avif/harbor-scale.avif b/avif/harbor-scale.avif
new file mode 100644
index 00000000..d0e18305
Binary files /dev/null and b/avif/harbor-scale.avif differ
diff --git a/avif/lastsignal-dark.avif b/avif/lastsignal-dark.avif
new file mode 100644
index 00000000..2f400933
Binary files /dev/null and b/avif/lastsignal-dark.avif differ
diff --git a/avif/lastsignal-light.avif b/avif/lastsignal-light.avif
new file mode 100644
index 00000000..6f876275
Binary files /dev/null and b/avif/lastsignal-light.avif differ
diff --git a/avif/lastsignal.avif b/avif/lastsignal.avif
new file mode 100644
index 00000000..45ee16c9
Binary files /dev/null and b/avif/lastsignal.avif differ
diff --git a/avif/moltbot-dark.avif b/avif/openclaw-dark.avif
similarity index 100%
rename from avif/moltbot-dark.avif
rename to avif/openclaw-dark.avif
diff --git a/avif/moltbot-light.avif b/avif/openclaw-light.avif
similarity index 100%
rename from avif/moltbot-light.avif
rename to avif/openclaw-light.avif
diff --git a/avif/moltbot.avif b/avif/openclaw.avif
similarity index 100%
rename from avif/moltbot.avif
rename to avif/openclaw.avif
diff --git a/build/VERSION b/build/VERSION
index a0cd9f0c..50e47c89 100755
--- a/build/VERSION
+++ b/build/VERSION
@@ -1 +1 @@
-3.1.0
\ No newline at end of file
+3.1.1
\ No newline at end of file
diff --git a/build/main.go b/build/main.go
index e0d59e3d..5c913a01 100755
--- a/build/main.go
+++ b/build/main.go
@@ -54,7 +54,6 @@ func (c *Cache) Get(key string) (string, bool) {
 	}
 
 	if time.Since(item.Timestamp) > c.ttl {
-		delete(c.items, key)
 		return "", false
 	}
 
@@ -430,6 +429,11 @@ func main() {
 
 	mux.HandleFunc("GET /custom/{filename}", handleCustomIcon)
 
+	// Suppress favicon load error message in logs when viewing via browser
+	mux.HandleFunc("GET /favicon.ico", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNoContent)
+	})
+
 	mux.HandleFunc("GET /{iconname}/{colorcode}", handleIcon)
 	mux.HandleFunc("GET /{iconname}", handleIcon)
 
diff --git a/ico/harbor-scale-dark.ico b/ico/harbor-scale-dark.ico
new file mode 100644
index 00000000..3cf42afb
Binary files /dev/null and b/ico/harbor-scale-dark.ico differ
diff --git a/ico/harbor-scale-light.ico b/ico/harbor-scale-light.ico
new file mode 100644
index 00000000..5af9d31f
Binary files /dev/null and b/ico/harbor-scale-light.ico differ
diff --git a/ico/harbor-scale.ico b/ico/harbor-scale.ico
new file mode 100644
index 00000000..0eba8dd1
Binary files /dev/null and b/ico/harbor-scale.ico differ
diff --git a/ico/lastsignal-dark.ico b/ico/lastsignal-dark.ico
new file mode 100644
index 00000000..f5821589
Binary files /dev/null and b/ico/lastsignal-dark.ico differ
diff --git a/ico/lastsignal-light.ico b/ico/lastsignal-light.ico
new file mode 100644
index 00000000..f66bcb37
Binary files /dev/null and b/ico/lastsignal-light.ico differ
diff --git a/ico/lastsignal.ico b/ico/lastsignal.ico
new file mode 100644
index 00000000..6fa02a50
Binary files /dev/null and b/ico/lastsignal.ico differ
diff --git a/ico/moltbot-dark.ico b/ico/openclaw-dark.ico
similarity index 100%
rename from ico/moltbot-dark.ico
rename to ico/openclaw-dark.ico
diff --git a/ico/moltbot-light.ico b/ico/openclaw-light.ico
similarity index 100%
rename from ico/moltbot-light.ico
rename to ico/openclaw-light.ico
diff --git a/ico/moltbot.ico b/ico/openclaw.ico
similarity index 100%
rename from ico/moltbot.ico
rename to ico/openclaw.ico
diff --git a/png/harbor-scale-dark.png b/png/harbor-scale-dark.png
new file mode 100755
index 00000000..0f43a3d7
Binary files /dev/null and b/png/harbor-scale-dark.png differ
diff --git a/png/harbor-scale-light.png b/png/harbor-scale-light.png
new file mode 100755
index 00000000..401e0dc3
Binary files /dev/null and b/png/harbor-scale-light.png differ
diff --git a/png/harbor-scale.png b/png/harbor-scale.png
new file mode 100755
index 00000000..85924ff1
Binary files /dev/null and b/png/harbor-scale.png differ
diff --git a/png/lastsignal-dark.png b/png/lastsignal-dark.png
new file mode 100755
index 00000000..5f573029
Binary files /dev/null and b/png/lastsignal-dark.png differ
diff --git a/png/lastsignal-light.png b/png/lastsignal-light.png
new file mode 100755
index 00000000..394ce0e6
Binary files /dev/null and b/png/lastsignal-light.png differ
diff --git a/png/lastsignal.png b/png/lastsignal.png
new file mode 100755
index 00000000..1b0123b1
Binary files /dev/null and b/png/lastsignal.png differ
diff --git a/png/moltbot-dark.png b/png/openclaw-dark.png
similarity index 100%
rename from png/moltbot-dark.png
rename to png/openclaw-dark.png
diff --git a/png/moltbot-light.png b/png/openclaw-light.png
similarity index 100%
rename from png/moltbot-light.png
rename to png/openclaw-light.png
diff --git a/png/moltbot.png b/png/openclaw.png
similarity index 100%
rename from png/moltbot.png
rename to png/openclaw.png
diff --git a/svg/harbor-scale-dark.svg b/svg/harbor-scale-dark.svg
new file mode 100755
index 00000000..1100d362
--- /dev/null
+++ b/svg/harbor-scale-dark.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" viewBox="0 0 512 512"><path d="M26.5 257v-1c0-126.6 103-229.5 229.5-229.5 126.6 0 229.5 103 229.5 229.5v1c7.5-1.3 15.1-2 22.7-1.9h3.7C511.5 114.4 396.8 0 256 0S.5 114.4 0 255.1h3.7c7.7 0 15.2.6 22.8 1.9m458.1 19.7c-8.5 2.1-16.6 5.3-24.3 9.5-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-7.3-4.1-15.1-7.2-23.2-9.2s-16.4-3-24.8-2.8H.6c.6 8.9 1.7 17.7 3.3 26.5 12.9 0 20.9 2.3 28 5.4 2.7 1.2 5.2 2.4 7.8 3.8 11.2 5.6 23.8 12 48 12s36.8-6.3 48-12c9.8-4.9 18.2-9.2 36.1-9.2s26.3 4.2 36.1 9.2c11.2 5.6 23.8 12 48 12s36.8-6.3 48-12c9.8-4.9 18.2-9.2 36.1-9.2s26.3 4.2 36.1 9.2c11.2 5.6 23.8 12 48 12s36.8-6.3 48-12c2.7-1.3 5.2-2.6 7.9-3.8 7.1-3.1 15.1-5.4 28-5.4q2.4-13.05 3.3-26.4h-3.1c-7.9-.1-15.8.7-23.6 2.4m-24.3 72.9c-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-2.2-1.1-4.4-2.2-6.7-3.3-10-4.8-20.5-7.5-31.5-8.3 3.3 9.9 7.3 19.6 11.9 29 5 1.7 9.8 3.7 14.5 6.3 7.9 4.3 16.3 7.5 25 9.6 7.6 1.6 15.3 2.4 23 2.3 24.2 0 36.8-6.4 48-12 9.8-4.9 18.2-9.2 36.1-9.2s26.3 4.2 36.1 9.2c11.2 5.6 23.8 12 48 12s36.8-6.4 48-12c9.8-4.9 18.2-9.2 36.1-9.2s26.2 4.2 36.1 9.1c11.2 5.6 23.8 12 48 12 7.8.1 15.5-.7 23-2.3q13.05-3.15 24.9-9.6c4.7-2.5 9.5-4.6 14.5-6.3 4.5-9.4 8.5-19.1 11.9-29-11 .8-21.5 3.5-31.5 8.3-2.4 1.2-4.7 2.3-6.8 3.4m-45.5 72.1c-11.8-1.2-18.8-4.7-26.6-8.7-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-9.8 4.9-18.2 9.2-36.1 9.2S229.8 418 220 413c-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-7.9 4-14.9 7.5-26.6 8.7-3.2.3-6.3.5-9.5.5-15.6 0-24-3.2-32.4-7.3 9.7 12.2 20.4 23.5 32.2 33.8h.3c15.4 0 26.1-2.6 34.8-5.9 4.5-1.8 8.9-3.8 13.2-6.1 9.8-4.9 18.2-9.2 36.1-9.2s26.3 4.2 36.1 9.2c11.2 5.6 23.8 12 48 12s36.8-6.4 48-12c9.8-4.9 18.2-9.2 36.1-9.2s26.2 4.3 36 9.2c4.3 2.3 8.7 4.3 13.2 6.2 8.6 3.3 19.4 5.9 34.7 5.9h.3c11.7-10.3 22.5-21.6 32.1-33.9-8.4 4.1-16.8 7.4-32.5 7.4q-4.65-.15-9.3-.6m-74.7 42.7c-24.2 0-36.8 6.4-48 12-9.5 4.8-17.7 8.9-34.5 9.1h-3.3c-16.8-.3-25-4.4-34.4-9.1-11.2-5.6-23.8-12-48-12-4 0-7.7.2-11.1.5-16.6 1.5-26.8 6.4-35.9 11 10.3 6.2 21 11.6 32 16.2 4.9-.9 9.9-1.3 14.9-1.2 17.9 0 26.3 4.3 36.1 9.2 10.8 5.4 23 11.6 45.8 12h4.5c22.7-.4 34.9-6.5 45.8-12 9.8-4.9 18.2-9.2 36.1-9.2 5 0 10 .4 14.9 1.2 11.1-4.7 21.7-10.1 32-16.2-9-4.5-19.3-9.4-35.9-11-3.4-.3-7-.5-11-.5"/></svg>
\ No newline at end of file
diff --git a/svg/harbor-scale-light.svg b/svg/harbor-scale-light.svg
new file mode 100755
index 00000000..1e898f39
--- /dev/null
+++ b/svg/harbor-scale-light.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" viewBox="0 0 512 512"><path d="M26.5 257v-1c0-126.6 103-229.5 229.5-229.5 126.6 0 229.5 103 229.5 229.5v1c7.5-1.3 15.1-2 22.7-1.9h3.7C511.5 114.4 396.8 0 256 0S.5 114.4 0 255.1h3.7c7.7 0 15.2.6 22.8 1.9m458.1 19.7c-8.5 2.1-16.6 5.3-24.3 9.5-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-7.3-4.1-15.1-7.2-23.2-9.2s-16.4-3-24.8-2.8H.6c.6 8.9 1.7 17.7 3.3 26.5 12.9 0 20.9 2.3 28 5.4 2.7 1.2 5.2 2.4 7.8 3.8 11.2 5.6 23.8 12 48 12s36.8-6.3 48-12c9.8-4.9 18.2-9.2 36.1-9.2s26.3 4.2 36.1 9.2c11.2 5.6 23.8 12 48 12s36.8-6.3 48-12c9.8-4.9 18.2-9.2 36.1-9.2s26.3 4.2 36.1 9.2c11.2 5.6 23.8 12 48 12s36.8-6.3 48-12c2.7-1.3 5.2-2.6 7.9-3.8 7.1-3.1 15.1-5.4 28-5.4q2.4-13.05 3.3-26.4h-3.1c-7.9-.1-15.8.7-23.6 2.4m-24.3 72.9c-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-9.8 4.9-18.2 9.2-36.1 9.2s-26.3-4.3-36.1-9.2c-2.2-1.1-4.4-2.2-6.7-3.3-10-4.8-20.5-7.5-31.5-8.3 3.3 9.9 7.3 19.6 11.9 29 5 1.7 9.8 3.7 14.5 6.3 7.9 4.3 16.3 7.5 25 9.6 7.6 1.6 15.3 2.4 23 2.3 24.2 0 36.8-6.4 48-12 9.8-4.9 18.2-9.2 36.1-9.2s26.3 4.2 36.1 9.2c11.2 5.6 23.8 12 48 12s36.8-6.4 48-12c9.8-4.9 18.2-9.2 36.1-9.2s26.2 4.2 36.1 9.1c11.2 5.6 23.8 12 48 12 7.8.1 15.5-.7 23-2.3q13.05-3.15 24.9-9.6c4.7-2.5 9.5-4.6 14.5-6.3 4.5-9.4 8.5-19.1 11.9-29-11 .8-21.5 3.5-31.5 8.3-2.4 1.2-4.7 2.3-6.8 3.4m-45.5 72.1c-11.8-1.2-18.8-4.7-26.6-8.7-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-9.8 4.9-18.2 9.2-36.1 9.2S229.8 418 220 413c-11.2-5.6-23.8-12-48-12s-36.8 6.4-48 12c-7.9 4-14.9 7.5-26.6 8.7-3.2.3-6.3.5-9.5.5-15.6 0-24-3.2-32.4-7.3 9.7 12.2 20.4 23.5 32.2 33.8h.3c15.4 0 26.1-2.6 34.8-5.9 4.5-1.8 8.9-3.8 13.2-6.1 9.8-4.9 18.2-9.2 36.1-9.2s26.3 4.2 36.1 9.2c11.2 5.6 23.8 12 48 12s36.8-6.4 48-12c9.8-4.9 18.2-9.2 36.1-9.2s26.2 4.3 36 9.2c4.3 2.3 8.7 4.3 13.2 6.2 8.6 3.3 19.4 5.9 34.7 5.9h.3c11.7-10.3 22.5-21.6 32.1-33.9-8.4 4.1-16.8 7.4-32.5 7.4q-4.65-.15-9.3-.6m-74.7 42.7c-24.2 0-36.8 6.4-48 12-9.5 4.8-17.7 8.9-34.5 9.1h-3.3c-16.8-.3-25-4.4-34.4-9.1-11.2-5.6-23.8-12-48-12-4 0-7.7.2-11.1.5-16.6 1.5-26.8 6.4-35.9 11 10.3 6.2 21 11.6 32 16.2 4.9-.9 9.9-1.3 14.9-1.2 17.9 0 26.3 4.3 36.1 9.2 10.8 5.4 23 11.6 45.8 12h4.5c22.7-.4 34.9-6.5 45.8-12 9.8-4.9 18.2-9.2 36.1-9.2 5 0 10 .4 14.9 1.2 11.1-4.7 21.7-10.1 32-16.2-9-4.5-19.3-9.4-35.9-11-3.4-.3-7-.5-11-.5" style="fill:#fff"/></svg>
\ No newline at end of file
diff --git a/svg/harbor-scale.svg b/svg/harbor-scale.svg
new file mode 100755
index 00000000..fffc4a58
--- /dev/null
+++ b/svg/harbor-scale.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/svg/lastsignal-dark.svg b/svg/lastsignal-dark.svg
new file mode 100755
index 00000000..f0a6c92d
--- /dev/null
+++ b/svg/lastsignal-dark.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/svg/lastsignal-light.svg b/svg/lastsignal-light.svg
new file mode 100755
index 00000000..95a53461
--- /dev/null
+++ b/svg/lastsignal-light.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" viewBox="0 0 512 512"><linearGradient id="lastsignal-light_svg__a" x1="-656.362" x2="-630.763" y1="783.15" y2="757.55" gradientTransform="matrix(16 0 0 -20 10553 15663)" gradientUnits="userSpaceOnUse"><stop offset="0" style="stop-color:#fff"/><stop offset="1" style="stop-color:#fff;stop-opacity:.5"/></linearGradient><path d="M256 0C142.9 0 51.2 91.7 51.2 204.8v102.4C51.2 420.3 142.9 512 256 512s204.8-91.7 204.8-204.8V204.8C460.8 91.7 369.1 0 256 0m0 51.2c84.8 0 153.6 68.8 153.6 153.6v25.6H102.4v-25.6c0-84.8 68.8-153.6 153.6-153.6m0 409.6c-84.8 0-153.6-68.8-153.6-153.6v-25.6h307.2v25.6c0 84.8-68.8 153.6-153.6 153.6" style="fill:url(#lastsignal-light_svg__a)"/><linearGradient id="lastsignal-light_svg__b" x1="-479.55" x2="-453.95" y1="653.95" y2="628.35" gradientTransform="matrix(4 0 0 -4 2123 2923)" gradientUnits="userSpaceOnUse"><stop offset="0" style="stop-color:#fff"/><stop offset="1" style="stop-color:#fff;stop-opacity:.5"/></linearGradient><circle cx="256" cy="358.4" r="51.2" style="fill:url(#lastsignal-light_svg__b)"/></svg>
\ No newline at end of file
diff --git a/svg/lastsignal.svg b/svg/lastsignal.svg
new file mode 100755
index 00000000..a2b408ec
--- /dev/null
+++ b/svg/lastsignal.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" viewBox="0 0 512 512"><linearGradient id="lastsignal_svg__a" x1="-656.362" x2="-630.763" y1="783.15" y2="757.55" gradientTransform="matrix(16 0 0 -20 10553 15663)" gradientUnits="userSpaceOnUse"><stop offset="0" style="stop-color:#6366f1"/><stop offset="1" style="stop-color:#22d3ee"/></linearGradient><path d="M256 0C142.9 0 51.2 91.7 51.2 204.8v102.4C51.2 420.3 142.9 512 256 512s204.8-91.7 204.8-204.8V204.8C460.8 91.7 369.1 0 256 0m0 51.2c84.8 0 153.6 68.8 153.6 153.6v25.6H102.4v-25.6c0-84.8 68.8-153.6 153.6-153.6m0 409.6c-84.8 0-153.6-68.8-153.6-153.6v-25.6h307.2v25.6c0 84.8-68.8 153.6-153.6 153.6" style="fill:url(#lastsignal_svg__a)"/><linearGradient id="lastsignal_svg__b" x1="-479.55" x2="-453.95" y1="653.95" y2="628.35" gradientTransform="matrix(4 0 0 -4 2123 2923)" gradientUnits="userSpaceOnUse"><stop offset="0" style="stop-color:#6366f1"/><stop offset="1" style="stop-color:#22d3ee"/></linearGradient><circle cx="256" cy="358.4" r="51.2" style="fill:url(#lastsignal_svg__b)"/></svg>
\ No newline at end of file
diff --git a/svg/moltbot-dark.svg b/svg/openclaw-dark.svg
similarity index 100%
rename from svg/moltbot-dark.svg
rename to svg/openclaw-dark.svg
diff --git a/svg/moltbot-light.svg b/svg/openclaw-light.svg
similarity index 100%
rename from svg/moltbot-light.svg
rename to svg/openclaw-light.svg
diff --git a/svg/moltbot.svg b/svg/openclaw.svg
similarity index 100%
rename from svg/moltbot.svg
rename to svg/openclaw.svg
diff --git a/webp/harbor-scale-dark.webp b/webp/harbor-scale-dark.webp
new file mode 100755
index 00000000..13e2f0b7
Binary files /dev/null and b/webp/harbor-scale-dark.webp differ
diff --git a/webp/harbor-scale-light.webp b/webp/harbor-scale-light.webp
new file mode 100755
index 00000000..53f07528
Binary files /dev/null and b/webp/harbor-scale-light.webp differ
diff --git a/webp/harbor-scale.webp b/webp/harbor-scale.webp
new file mode 100755
index 00000000..1d2ebb45
Binary files /dev/null and b/webp/harbor-scale.webp differ
diff --git a/webp/lastsignal-dark.webp b/webp/lastsignal-dark.webp
new file mode 100755
index 00000000..196ba4f0
Binary files /dev/null and b/webp/lastsignal-dark.webp differ
diff --git a/webp/lastsignal-light.webp b/webp/lastsignal-light.webp
new file mode 100755
index 00000000..c55e0120
Binary files /dev/null and b/webp/lastsignal-light.webp differ
diff --git a/webp/lastsignal.webp b/webp/lastsignal.webp
new file mode 100755
index 00000000..d6ecfb1c
Binary files /dev/null and b/webp/lastsignal.webp differ
diff --git a/webp/moltbot-dark.webp b/webp/openclaw-dark.webp
similarity index 100%
rename from webp/moltbot-dark.webp
rename to webp/openclaw-dark.webp
diff --git a/webp/moltbot-light.webp b/webp/openclaw-light.webp
similarity index 100%
rename from webp/moltbot-light.webp
rename to webp/openclaw-light.webp
diff --git a/webp/moltbot.webp b/webp/openclaw.webp
similarity index 100%
rename from webp/moltbot.webp
rename to webp/openclaw.webp