diff --git a/CHANGELOG.md b/CHANGELOG.md
index 425c772..3689350 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [0.08.15] - 2026-02-20
+
+### Added
+- **`web.online_threshold`** in `config.yaml` (Default: 900 s): Online-Schwellwert zentral
+  konfigurierbar; Änderung in der Config wirkt sofort auf alle Stellen (closes #12).
+- **`/api/stats`** liefert `online_threshold` – Frontend liest Wert vom Backend.
+
+### Changed
+- `meshbot/bot.py`: `?mesh`-Kommando nutzt `config.get("web.online_threshold", 900)`.
+- `meshbot/database.py`: `nodes_online`-Abfrage nutzt konfigurierten Schwellwert.
+- `static/js/dashboard.js`: `isOnline()` nutzt `onlineThreshold` aus Stats-API statt hardcodierter 900.
+
 ## [0.08.14] - 2026-02-20
 
 ### Added
diff --git a/config.yaml b/config.yaml
index 66da1e5..399c3e1 100644
--- a/config.yaml
+++ b/config.yaml
@@ -1,4 +1,4 @@
-version: "0.08.14"
+version: "0.08.15"
 
 bot:
   name: "MeshDD-Bot"
@@ -11,6 +11,7 @@ meshtastic:
 web:
   host: "0.0.0.0"
   port: 8081
+  online_threshold: 900
 
 database:
   path: "meshdd.db"
diff --git a/meshbot/bot.py b/meshbot/bot.py
index b1b2189..7e6936b 100644
--- a/meshbot/bot.py
+++ b/meshbot/bot.py
@@ -563,7 +563,8 @@ class MeshBot:
         nodes = await self.db.get_all_nodes()
         total = len(nodes)
         now = time.time()
-        online = sum(1 for n in nodes if n.get("last_seen") and now - n["last_seen"] < 900)
+        threshold = config.get("web.online_threshold", 900)
+        online = sum(1 for n in nodes if n.get("last_seen") and now - n["last_seen"] < threshold)
         active_24h = sum(1 for n in nodes if n.get("last_seen") and now - n["last_seen"] < 86400)
         with_pos = sum(1 for n in nodes if n.get("lat") and n.get("lon"))
 
diff --git a/meshbot/database.py b/meshbot/database.py
index 26ef1d9..dbb80f2 100644
--- a/meshbot/database.py
+++ b/meshbot/database.py
@@ -2,6 +2,8 @@ import aiosqlite
 import time
 import logging
 
+from meshbot import config
+
 logger = logging.getLogger(__name__)
 
 
@@ -207,8 +209,9 @@ class Database:
             "SELECT COUNT(*) FROM nodes WHERE last_seen >= ?", (day_ago,)
         ) as c:
             stats["nodes_24h"] = (await c.fetchone())[0]
+        threshold = config.get("web.online_threshold", 900)
         async with self.db.execute(
-            "SELECT COUNT(*) FROM nodes WHERE last_seen >= ?", (now - 900,)
+            "SELECT COUNT(*) FROM nodes WHERE last_seen >= ?", (now - threshold,)
         ) as c:
             stats["nodes_online"] = (await c.fetchone())[0]
         async with self.db.execute(
diff --git a/meshbot/webserver.py b/meshbot/webserver.py
index dc65145..11e5729 100644
--- a/meshbot/webserver.py
+++ b/meshbot/webserver.py
@@ -110,6 +110,7 @@ class WebServer:
             my_id = self.bot.get_my_node_id() if self.bot else None
             stats = await self.db.get_stats(my_node_id=my_id)
             stats["version"] = config.get("version", "0.00.00")
+            stats["online_threshold"] = config.get("web.online_threshold", 900)
             if self.bot:
                 stats["uptime"] = self.bot.get_uptime()
                 stats["bot_connected"] = self.bot.is_connected()
@@ -159,6 +160,7 @@ class WebServer:
         my_id = self.bot.get_my_node_id() if self.bot else None
         stats = await self.db.get_stats(my_node_id=my_id)
         stats["version"] = config.get("version", "0.00.00")
+        stats["online_threshold"] = config.get("web.online_threshold", 900)
         if self.bot:
             stats["uptime"] = self.bot.get_uptime()
             stats["bot_connected"] = self.bot.is_connected()
diff --git a/static/js/dashboard.js b/static/js/dashboard.js
index 585317d..48be231 100644
--- a/static/js/dashboard.js
+++ b/static/js/dashboard.js
@@ -12,6 +12,7 @@ let nodeSearch = '';
 let nodeOnlineFilter = false;
 let nodeSortKey = 'last_seen';
 let nodeSortDir = -1;
+let onlineThreshold = 900;
 let chartChannel = null;
 let chartHops = null;
 let chartHardware = null;
@@ -163,6 +164,7 @@ function updateBotStatus(status) {
 
 function updateStats(stats) {
     lastStats = stats;
+    if (stats.online_threshold != null) onlineThreshold = stats.online_threshold;
     if (stats.version) {
         document.getElementById('versionLabel').textContent = `v${stats.version}`;
     }
@@ -187,7 +189,7 @@ function updateStats(stats) {
 
 function isOnline(lastSeen) {
     if (!lastSeen) return false;
-    return (Date.now() / 1000 - lastSeen) < 900; // < 15 min
+    return (Date.now() / 1000 - lastSeen) < onlineThreshold;
 }
 
 function timeAgo(timestamp) {