diff --git a/core/archipelago/src/api/rpc/lnd/macaroons.rs b/core/archipelago/src/api/rpc/lnd/macaroons.rs
index 5c293575..91606af6 100644
--- a/core/archipelago/src/api/rpc/lnd/macaroons.rs
+++ b/core/archipelago/src/api/rpc/lnd/macaroons.rs
@@ -518,8 +518,46 @@ impl RpcHandler {
 
 // ── The rotation itself ──────────────────────────────────────────────────────
 
+/// Hold LND's lifecycle lock for the whole rotation, then do the work.
+///
+/// Between "stop LND" and "start LND" this owns a stopped container with its
+/// credential material deleted — the single worst moment for another actor to
+/// step in. Two would, unasked: the health monitor restarts any container it
+/// finds stopped, and the reconciler starts one whose unit is enabled. Either
+/// brings LND back up mid-deletion, and LND re-mints `macaroons.db` on unlock —
+/// so the deletion loop would race a live process writing that file, or
+/// "succeed" against material that had already been regenerated, leaving the
+/// operator told they had rotated while the old root key was still in service.
+///
+/// `app_ops::op_lock` is the mechanism both of those actors already consult
+/// (`lifecycle_op_in_flight`, via `lifecycle_op_covers_container` in the health
+/// monitor), and it also serialises against the package.start/stop/restart
+/// workers, so an operator hitting "Restart" on Lightning mid-rotation queues
+/// instead of interleaving.
+///
+/// Chosen over the `user-stopped` marker that `recreate_wallet_destructively`
+/// uses for its own window: that marker is a file on disk, so a rotation that
+/// died between marking and clearing would leave Lightning suppressed
+/// *permanently*, fixable only by finding and editing JSON on the node. This
+/// guard releases when it drops, on every path including a panic.
 async fn run_rotation(
     orchestrator: Option<Arc<dyn crate::container::ContainerOrchestrator>>,
+) -> Result<()> {
+    let lock = crate::app_ops::op_lock(LND_CONTAINER);
+    // Fail fast rather than queue. This is a button someone just pressed: a
+    // silent wait behind a start/stop/restart that may itself take minutes reads
+    // as "nothing happened", and the honest answer is short.
+    let _guard = lock.try_lock().map_err(|_| {
+        anyhow::anyhow!(
+            "another Lightning start/stop/restart is in progress on this node — \
+             wait for it to finish and try again"
+        )
+    })?;
+    rotate_with_lnd_pinned(orchestrator).await
+}
+
+async fn rotate_with_lnd_pinned(
+    orchestrator: Option<Arc<dyn crate::container::ContainerOrchestrator>>,
 ) -> Result<()> {
     // 1. Preflight — establish what must survive, while LND can still be asked.
     with_progress(|p| p.set("preflight", StepState::Running, None));
@@ -584,7 +622,8 @@ async fn run_rotation(
         );
     });
 
-    // 3. Stop.
+    // 3. Stop. Nothing may restart LND from here until step 5 — see the lock
+    //    `run_rotation` holds around this whole function.
     with_progress(|p| p.set("stop", StepState::Running, None));
     stop_lnd().await.context("stopping LND")?;
     with_progress(|p| p.set("stop", StepState::Done, None));
diff --git a/docs/security/LND-MACAROON-ROTATION.md b/docs/security/LND-MACAROON-ROTATION.md
index 44b8b2ba..3ae6e47e 100644
--- a/docs/security/LND-MACAROON-ROTATION.md
+++ b/docs/security/LND-MACAROON-ROTATION.md
@@ -55,6 +55,31 @@ Two details in that check are deliberate and should not be "tightened":
   this node does not hold surfaces as a **failed rotation** with the wallet
   intact.
 
+## Nothing else may touch LND mid-rotation
+
+Between "stop LND" and "start LND" the rotation owns a stopped container whose
+credential material is being deleted. Two background actors would step in there
+unasked: the **health monitor** restarts any container it finds stopped, and the
+**reconciler** starts one whose unit is enabled. Either brings LND back up
+mid-deletion — and LND re-mints `macaroons.db` on unlock, so the deletion loop
+would race a live process writing that file, or "succeed" against material that
+had already been regenerated. The operator would be told they had rotated while
+the old root key was still in service.
+
+The rotation therefore holds `app_ops::op_lock("lnd")` for its whole duration.
+That is the lock both actors already consult (`lifecycle_op_in_flight`, reached
+in the health monitor via `lifecycle_op_covers_container`), and it also
+serialises against the `package.start`/`stop`/`restart` workers, so an operator
+hitting "Restart" on Lightning mid-rotation queues rather than interleaving. A
+rotation requested while one of those is running fails fast with a short
+explanation instead of waiting silently.
+
+Deliberately **not** the `user-stopped` marker that `recreate_wallet_destructively`
+uses for its own window: that marker is a file on disk, so a rotation that died
+between marking and clearing would leave Lightning suppressed *permanently* —
+fixable only by finding and editing JSON on the node. The lock guard releases
+when it drops, on every path including a panic.
+
 ## The BTCPay coupling — the part that bites
 
 **BTCPay Server keeps its own inline copy of the admin macaroon**, and it cannot
diff --git a/neode-ui/mock-backend.js b/neode-ui/mock-backend.js
index 9e92f789..0efb1afd 100755
--- a/neode-ui/mock-backend.js
+++ b/neode-ui/mock-backend.js
@@ -3704,6 +3704,48 @@ app.post('/rpc/v1', (req, res) => {
         })
       }
 
+      // Lightning credential rotation (Settings → Lightning credentials).
+      // Stateful so the dev preview can exercise the whole arc without a node:
+      // request a rotation and the steps advance on each poll, ending with the
+      // BTCPay reconnect. Digests only — the real daemon never returns a
+      // macaroon and neither does this.
+      case 'lnd.macaroon-status': {
+        return res.json({
+          result: {
+            installed: true,
+            admin_macaroon_sha256: '52219e90aeba8ac6a98fdac1cc754fe0a2e8407ae6758ffe2cf92039503f5575',
+            issued_at: '2026-08-08 06:03:11',
+            identity_pubkey: '03a1b2c3d4e5f6789012345678901234567890abcdef1234567890abcdef123456',
+            channels_open: 5,
+            channels_pending: 1,
+            lnd_error: null,
+            btcpay_uses_internal_lnd: true,
+            // Flip to false to see the "BTCPay is holding an old credential"
+            // warning this feature exists to prevent.
+            btcpay_credential_current: true,
+            rotation: macaroonRotationSnapshot(),
+          },
+        })
+      }
+
+      case 'lnd.rotate-macaroons': {
+        if (!params?.password) {
+          return res.json({ error: { code: -1, message: 'Node password required to rotate Lightning credentials' } })
+        }
+        if (params.password !== userState.passwordHash && params.password !== MOCK_PASSWORD) {
+          return res.json({ error: { code: -1, message: 'Password verification failed' } })
+        }
+        if (macaroonRotation.running) {
+          return res.json({ error: { code: -1, message: 'A macaroon rotation is already running on this node' } })
+        }
+        startMacaroonRotation()
+        return res.json({ result: { status: 'started' } })
+      }
+
+      case 'lnd.macaroon-rotation-progress': {
+        return res.json({ result: macaroonRotationSnapshot() })
+      }
+
       case 'lnd.gettransactions': {
         const pending = walletState.transactions.filter(tx => tx.direction === 'incoming' && tx.num_confirmations < 3).length
         return res.json({
@@ -6075,6 +6117,66 @@ const walletState = sessionBucketProxy('walletState')
 const userState = sessionBucketProxy('userState')
 const mockState = sessionBucketProxy('mockState')
 
+// ── Lightning macaroon rotation (mock) ──────────────────────────────────────
+// Mirrors the daemon's `RotationProgress`: same step keys and the same five
+// states, so the Settings section can be driven end-to-end without a node.
+// Advances one step per poll rather than on a timer, which keeps it
+// deterministic and makes each intermediate state actually observable.
+const MACAROON_ROTATION_STEPS = [
+  ['preflight', 'Check LND is healthy and record what must survive', '5 channel(s) open, 1 pending — these must be identical afterwards'],
+  ['backup', 'Back up the current macaroon material', '8 file(s) copied to /var/lib/archipelago/lnd/macaroon-rotation-20260808T120000Z'],
+  ['stop', 'Stop Lightning', null],
+  ['remove', 'Remove the old root key and issued macaroons', '8 file(s) removed'],
+  ['start', 'Start Lightning and unlock the wallet', 'Lightning is up with freshly minted credentials'],
+  ['verify', 'Confirm the node and its channels are unchanged', 'same node, same 5 channel(s)'],
+  ['btcpay', 'Reconnect BTCPay Server to the new credentials', 'Connection string updated. BTCPay restarts itself within a minute or two to pick it up.'],
+]
+
+const macaroonRotation = { running: false, done: 0, ok: null, startedAt: null, finishedAt: null }
+
+function startMacaroonRotation() {
+  macaroonRotation.running = true
+  macaroonRotation.done = 0
+  macaroonRotation.ok = null
+  macaroonRotation.startedAt = new Date().toISOString()
+  macaroonRotation.finishedAt = null
+}
+
+function macaroonRotationSnapshot() {
+  if (macaroonRotation.running) {
+    macaroonRotation.done += 1
+    if (macaroonRotation.done >= MACAROON_ROTATION_STEPS.length) {
+      macaroonRotation.done = MACAROON_ROTATION_STEPS.length
+      macaroonRotation.running = false
+      macaroonRotation.ok = true
+      macaroonRotation.finishedAt = new Date().toISOString()
+    }
+  }
+  const started = macaroonRotation.startedAt !== null
+  return {
+    running: macaroonRotation.running,
+    ok: macaroonRotation.ok,
+    started_at: macaroonRotation.startedAt,
+    finished_at: macaroonRotation.finishedAt,
+    error: null,
+    steps: MACAROON_ROTATION_STEPS.map(([key, label, detail], i) => {
+      let state = 'pending'
+      if (started) {
+        if (i < macaroonRotation.done) state = 'done'
+        else if (i === macaroonRotation.done && macaroonRotation.running) state = 'running'
+      }
+      return { key, label, state, detail: state === 'done' ? detail : null }
+    }),
+    backup_path: started ? '/var/lib/archipelago/lnd/macaroon-rotation-20260808T120000Z' : null,
+    identity_pubkey: started ? '03a1b2c3d4e5f6789012345678901234567890abcdef1234567890abcdef123456' : null,
+    channels_before: started ? 5 : null,
+    channels_after: macaroonRotation.ok ? 5 : null,
+    new_admin_macaroon_sha256: macaroonRotation.ok
+      ? '8c19b99de4a8f5c3145d8189500089829174909ca09b48f55e0464239bd8d412'
+      : null,
+  }
+}
+
 // Seed for the per-session Tor services demo state (tor.list-services /
 // tor.create-service / tor.delete-service round-trip against this).
 function defaultTorServices() {