fix: Telegram pairing approval required for existing bots / existing pairing skipped on reconfigure

src/channels/web/static/app.js

@@ -2640,7 +2640,7 @@ function renderExtensionCard(ext) {
     pairingSection.className = 'ext-pairing';
     pairingSection.setAttribute('data-channel', ext.name);
     card.appendChild(pairingSection);
-    loadPairingRequests(ext.name, pairingSection);
+    loadPairingRequests(ext.name, pairingSection, ext.activation_status);
   }
 
   return card;
@@ -3034,11 +3034,19 @@ function openOAuthUrl(url) {
 
 // --- Pairing ---
 
-function loadPairingRequests(channel, container) {
+function loadPairingRequests(channel, container, status) {
   apiFetch('/api/pairing/' + encodeURIComponent(channel))
     .then(data => {
       container.innerHTML = '';
-      if (!data.requests || data.requests.length === 0) return;
+      if (!data.requests || data.requests.length === 0) {
+        if (status === 'pairing') {
+          const hint = document.createElement('p');
+          hint.className = 'pairing-hint';
+          hint.textContent = 'Send any message to your bot to receive a pairing request here.';
+          container.appendChild(hint);
+        }
+        return;
+      }
 
       const heading = document.createElement('div');
       heading.className = 'pairing-heading';

src/channels/web/static/style.css

@@ -2865,6 +2865,13 @@ body {
   flex: 1;
 }
 
+.pairing-hint {
+  color: var(--text-secondary);
+  font-size: 13px;
+  margin: 4px 0 8px;
+  font-style: italic;
+}
+
 /* Configure modal */
 .configure-overlay {
   position: fixed;

src/extensions/manager.rs

@@ -3739,6 +3739,26 @@ impl ExtensionManager {
             }
         };
 
+        // Credentials changed (new bot token) — clear pairing state so existing users
+        // must re-approve with the new bot identity.
+        if cred_count > 0 {
+            let pairing_store = crate::pairing::PairingStore::new();
+            if let Err(e) = pairing_store.clear_allow_from(name) {
+                tracing::warn!(
+                    channel = %name,
+                    error = %e,
+                    "Failed to clear allow-from on credential refresh"
+                );
+            }
+            if let Err(e) = pairing_store.clear_pending(name) {
+                tracing::warn!(
+                    channel = %name,
+                    error = %e,
+                    "Failed to clear pending pairings on credential refresh"
+                );
+            }
+        }
+
         // Load capabilities file once to extract all secret names
         let cap_path = self
             .wasm_channels_dir

src/pairing/store.rs

@@ -440,6 +440,39 @@ impl PairingStore {
         Ok(file.allow_from)
     }
 
+    /// Clear the allow-from list for a channel.
+    ///
+    /// Called on credential refresh so that existing users must re-approve
+    /// after a bot token change.
+    pub fn clear_allow_from(&self, channel: &str) -> Result<(), PairingStoreError> {
+        let path = allow_from_path(&self.base_dir, channel)?;
+        if let Some(parent) = path.parent() {
+            fs::create_dir_all(parent)?;
+        }
+        let file = fs::OpenOptions::new()
+            .read(true)
+            .write(true)
+            .create(true)
+            .truncate(true)
+            .open(&path)?;
+        file.lock_exclusive()?;
+        let store = AllowFromStoreFile {
+            version: 1,
+            allow_from: Vec::new(),
+        };
+        let json = serde_json::to_string_pretty(&store)?;
+        fs::write(&path, json)?;
+        fs4::FileExt::unlock(&file)?;
+        Ok(())
+    }
+
+    /// Clear all pending pairing requests for a channel.
+    ///
+    /// Called on credential refresh so stale requests don't confuse users.
+    pub fn clear_pending(&self, channel: &str) -> Result<(), PairingStoreError> {
+        self.write_pairing_file(channel, &[])
+    }
+
     /// Check if a sender is allowed (by id or username).
     pub fn is_sender_allowed(
         &self,
@@ -717,4 +750,49 @@ mod tests {
         store.list_pending("").unwrap_err();
         store.upsert_request("", "u1", None).unwrap_err();
     }
+
+    #[test]
+    fn test_clear_allow_from_removes_all_entries() {
+        let (store, _) = test_store();
+        let r1 = store.upsert_request("telegram", "user1", None).unwrap();
+        store.approve("telegram", &r1.code).unwrap();
+
+        let list = store.read_allow_from("telegram").unwrap();
+        assert_eq!(list.len(), 1);
+
+        store.clear_allow_from("telegram").unwrap();
+        let list = store.read_allow_from("telegram").unwrap();
+        assert!(list.is_empty());
+    }
+
+    #[test]
+    fn test_clear_pending_removes_all_requests() {
+        let (store, _) = test_store();
+        store
+            .upsert_request("telegram", "user1", Some(serde_json::json!({"chat_id": 1})))
+            .unwrap();
+        store
+            .upsert_request("telegram", "user2", Some(serde_json::json!({"chat_id": 2})))
+            .unwrap();
+
+        let requests = store.list_pending("telegram").unwrap();
+        assert_eq!(requests.len(), 2);
+
+        store.clear_pending("telegram").unwrap();
+        let requests = store.list_pending("telegram").unwrap();
+        assert!(requests.is_empty());
+    }
+
+    #[test]
+    fn test_clear_allow_from_allows_new_approval() {
+        let (store, _) = test_store();
+        let r1 = store.upsert_request("telegram", "user1", None).unwrap();
+        store.approve("telegram", &r1.code).unwrap();
+
+        assert!(store.is_sender_allowed("telegram", "user1", None).unwrap());
+
+        store.clear_allow_from("telegram").unwrap();
+
+        assert!(!store.is_sender_allowed("telegram", "user1", None).unwrap());
+    }
 }