diff --git a/documentation/audits/os-guest-lane-2026-10-04/partA/A1-snapshot.txt b/documentation/audits/os-guest-lane-2026-10-04/partA/A1-snapshot.txt
new file mode 100644
index 00000000..74a7c46c
--- /dev/null
+++ b/documentation/audits/os-guest-lane-2026-10-04/partA/A1-snapshot.txt
@@ -0,0 +1,30 @@
+node=demo-hp
+libc6 2.41-12+deb13u3
+adventurelog Up 38 minutes (healthy)
+adventurelog-frontend Up 38 minutes (healthy)
+adventurelog-postgres Up 38 minutes (healthy)
+bentopdf Up 38 minutes (healthy)
+bookstack Up 38 minutes (healthy)
+bookstack-db Up 38 minutes (healthy)
+calibre-web Up 38 minutes (healthy)
+cloudflared Up 38 minutes
+docmost Up 38 minutes (healthy)
+docmost-postgres Up 38 minutes (healthy)
+docmost-redis Up 38 minutes (healthy)
+felhom-controller Up 38 minutes (healthy)
+filebrowser Up 37 minutes (healthy)
+kimai Up 38 minutes (healthy)
+kimai-db Up 38 minutes (healthy)
+opengist Up 38 minutes (healthy)
+paperless-postgres Up 38 minutes (healthy)
+paperless-redis Up 38 minutes (healthy)
+paperless-webserver Up 37 minutes (healthy)
+privatebin Up 38 minutes (healthy)
+romm Up 37 minutes (healthy)
+romm-db Up 37 minutes (healthy)
+romm-redis Up 37 minutes (healthy)
+traefik Up 38 minutes
+python3: can't open file '/root/pveapi.py': [Errno 13] Permission denied
+POST /nodes/demo-hp/lxc/9201/snapshot: http 200 task exit=snapshot feature is not available seconds=0.1
+`-> current                                             You are here!
+  data           61.90  2.69  
diff --git a/documentation/audits/os-guest-lane-2026-10-04/partA/A2-after.txt b/documentation/audits/os-guest-lane-2026-10-04/partA/A2-after.txt
new file mode 100644
index 00000000..d3460224
--- /dev/null
+++ b/documentation/audits/os-guest-lane-2026-10-04/partA/A2-after.txt
@@ -0,0 +1,2 @@
+  data           61.90  2.69  
+`-> current                                             You are here!
diff --git a/documentation/audits/os-guest-lane-2026-10-04/partA/README.md b/documentation/audits/os-guest-lane-2026-10-04/partA/README.md
new file mode 100644
index 00000000..6b032786
--- /dev/null
+++ b/documentation/audits/os-guest-lane-2026-10-04/partA/README.md
@@ -0,0 +1,19 @@
+# Part A — the snapshot undo (R-837), demo-hp 9201, 2026-10-04 ~10:30 CEST
+
+**Result: a snapshot of a customer guest is NOT possible. The automatic undo is not built (the brief's stop rule).**
+
+- Thin pool before: data 61.90 %, metadata 2.69 % (`A1-snapshot.txt`). After: unchanged (`A2-after.txt`) — nothing was created.
+- The agent's token has the rights: role `FelhomAgentGuest` on `/pool/felhom` holds `VM.Snapshot` and
+  `VM.Snapshot.Rollback`. Called AS THE TOKEN (`POST /nodes/demo-hp/lxc/9201/snapshot`, http 200): the task ends
+  `snapshot feature is not available` in 0.1 s. As root, `pct snapshot 9201 r837root`: the same.
+- Why, from the PVE source: `PVE/AbstractConfig.pm:755-757` dies with that message when
+  `has_feature('snapshot', …, $snapname eq 'vzdump')` fails; `PVE/LXC/Config.pm:97-110` checks EVERY mount point and
+  skips non-backup ones ONLY when that last flag is set — i.e. only for the backup's own snapshot named `vzdump`. A
+  customer guest always carries two host-path binds (`mp8 /mnt/felhom-drives`, `mp9 …/bootstrap`), which have no
+  snapshot feature. So: rootfs and mp0 are LVM-thin and could snapshot; the guest cannot.
+- The nightly whole-guest backup still works in snapshot mode (`create storage snapshot 'vzdump'`, 04:34:55).
+- **Rejected, not tried:** naming a snapshot `vzdump` to pass the check — the name is the backup's own and a
+  collision would break the night's backup; and taking raw LVM thin snapshots of rootfs + mp0 behind PVE's back (a
+  new mechanism nobody has measured — a STATUS decision, not a session improvisation).
+- Steps 2–3 (apply by hand, roll back) were not run: there is nothing to roll back to. 9201 is brought current by the
+  product's own OS leg in Part G.
diff --git a/documentation/audits/os-guest-lane-2026-10-04/partB/redproof.txt b/documentation/audits/os-guest-lane-2026-10-04/partB/redproof.txt
new file mode 100644
index 00000000..83a476e1
--- /dev/null
+++ b/documentation/audits/os-guest-lane-2026-10-04/partB/redproof.txt
@@ -0,0 +1,14 @@
+# Red-proof of configs/felhom-os-apply, 2026-10-04: for each refusal code, every `raise Refused("Rx", …)` is replaced by `pass` in a COPY, and the suite is run against the copy.
+R1: 7 raise(s) removed -> suite rc=1; failing tests: test_R1_not_owned_by_the_agent, test_R1_path_outside_the_plan_dir, test_R1_symlink; own test(s) failed: YES
+R2: 2 raise(s) removed -> suite rc=1; failing tests: test_R2_non_debian_origin_in_the_plan, test_R2_non_debian_origin_in_the_simulation; own test(s) failed: YES
+R3: 1 raise(s) removed -> suite rc=1; failing tests: test_R3_slow_lane; own test(s) failed: YES
+R4: 1 raise(s) removed -> suite rc=1; failing tests: test_R4_removal; own test(s) failed: YES
+R5: 1 raise(s) removed -> suite rc=1; failing tests: test_R5_downgrade_exact; own test(s) failed: YES
+R6: 4 raise(s) removed -> suite rc=1; failing tests: test_R6_allow_new_is_slow_lane, test_R6_new_package, test_R6_unlisted_package; own test(s) failed: YES
+R7: 7 raise(s) removed -> suite rc=1; failing tests: test_R7_not_downloadable_and_no_snapshot, test_snapshot_does_not_have_it_either; own test(s) failed: YES
+R8: 1 raise(s) removed -> suite rc=1; failing tests: test_R8_free_space; own test(s) failed: YES
+R9: 2 raise(s) removed -> suite rc=1; failing tests: test_R9_apt_lock_held, test_R9_guest_locked_by_a_backup; own test(s) failed: YES
+R10: 4 raise(s) removed -> suite rc=1; failing tests: test_R10_bind_only_in_a_snapshot_section, test_R10_not_running, test_R10_not_the_boxs_own_guest, test_R10_reserved_vmid; own test(s) failed: YES
+R11: 9 raise(s) removed -> suite rc=1; failing tests: test_R11_bad_name, test_R11_bad_version_string, test_R11_duplicate; own test(s) failed: YES
+R12: 1 raise(s) removed -> suite rc=1; failing tests: test_R12_host_layer; own test(s) failed: YES
+R13: 1 raise(s) removed -> suite rc=1; failing tests: test_R13_repair_does_not_fix_it; own test(s) failed: YES
diff --git a/documentation/audits/os-guest-lane-2026-10-04/partC/agent-leg-redproofs.txt b/documentation/audits/os-guest-lane-2026-10-04/partC/agent-leg-redproofs.txt
new file mode 100644
index 00000000..ceef95c0
--- /dev/null
+++ b/documentation/audits/os-guest-lane-2026-10-04/partC/agent-leg-redproofs.txt
@@ -0,0 +1,35 @@
+# agent v0.140.0 OS leg red-proofs, 2026-10-04 (each mutation applied, COMPILES, tests run, reverted; the package result line is printed so a build failure cannot pass as a red-proof)
+== mutation: fast-lane
+--- FAIL: TestRing0_PlansTheFastLaneOnly (0.00s)
+    leg_test.go:114: ring-0 plan = [map[name:libc6 origin:Debian version:u4] map[name:openssl origin:Debian-Security version:u3] map[name:docker-ce origin:Debian version:29.8]], want libc6 + openssl only
+FAIL	gitea.dooplex.hu/admin/felhom-agent/internal/osupdate	0.199s
+== mutation: switch
+--- FAIL: TestSwitchOff_ReportsOnly (0.00s)
+    leg_test.go:174: rep={RunID:20261004T040000Z Trigger:night Mode:inventory Ring:0 ReleaseID:ring0-20261004T040000Z Outcome: Healthy:true HealthReason: VMID:9201 Upgraded:[] Installed:[{Name:libc6 Version:u3 Origin:Deb
+FAIL	gitea.dooplex.hu/admin/felhom-agent/internal/osupdate	0.216s
+== mutation: health-containers
+--- FAIL: TestHealth_FailsAfterTheWait (0.00s)
+    leg_test.go:187: rep = {RunID:20261004T040000Z Trigger:night Mode:apply Ring:0 ReleaseID:ring0-20261004T040000Z Outcome:health_failed Healthy:false HealthReason:app was healthy and is  VMID:9201 Upgraded:[{Name:libc6
+FAIL	gitea.dooplex.hu/admin/felhom-agent/internal/osupdate	0.206s
+== mutation: health-controller
+ok  	gitea.dooplex.hu/admin/felhom-agent/internal/osupdate	0.197s
+== mutation: once-per-night
+--- FAIL: TestOncePerNight (0.00s)
+    leg_test.go:235: a second night run in the same night ran: {RunID:20261004T040000Z Trigger:night Mode:apply Ring:0 ReleaseID:ring0-20261004T040000Z Outcome:applied Healthy:true HealthReason: VMID:9201 Upgraded:[{Name
+FAIL	gitea.dooplex.hu/admin/felhom-agent/internal/osupdate	0.203s
+== mutation: ring1-uses-release
+--- FAIL: TestRing1_InstallsExactlyTheRelease (0.00s)
+    leg_test.go:142: ring-1 plan = map[lane:fast layer:guest mode:apply packages:[map[name:libc6 origin:Debian version:u4-approvedx]] release_id:os-1 snapshot:20261004T080000Z vmid:9201]
+FAIL	gitea.dooplex.hu/admin/felhom-agent/internal/osupdate	0.195s
+== reverted
+ok  	gitea.dooplex.hu/admin/felhom-agent/internal/osupdate	(cached)
+== mutation: health-controller (after adding the case "only the controller differs")
+--- FAIL: TestHealthVerdict (0.00s)
+    leg_test.go:225: only the controller differs: got true (), want false
+FAIL	gitea.dooplex.hu/admin/felhom-agent/internal/osupdate	0.197s
+== RP (local API hook): run the leg AFTER the gate is released
+        afterbackup_test.go:55: the heavy-op gate was free while the leg ran — a restore-test could overlap it
+FAIL	gitea.dooplex.hu/admin/felhom-agent/internal/localapi	0.563s
+== RP (local API hook): run the leg after a FAILED backup too
+        afterbackup_test.go:60: the leg ran after a FAILED backup: [8200]
+FAIL (recorded from the run above)
diff --git a/documentation/audits/os-guest-lane-2026-10-04/partD/hub-redproofs.txt b/documentation/audits/os-guest-lane-2026-10-04/partD/hub-redproofs.txt
new file mode 100644
index 00000000..3760a9ba
--- /dev/null
+++ b/documentation/audits/os-guest-lane-2026-10-04/partD/hub-redproofs.txt
@@ -0,0 +1,18 @@
+# hub v0.130.0 approval-rule red-proofs, 2026-10-04 (each mutation applied, tests run, reverted)
+== mutation: age
+--- FAIL: TestApproval_WaitHealthyAndOneNight (0.03s)
+    service_test.go:65: fresh set approved or wrong reason: {Fingerprint:8415f8a9ec63c815 FirstSeen:2026-10-04 12:00:00 +0000 UTC Packages:2 Waiting:hp has 0 of 1 night run(s) since the set was first seen}
+== mutation: healthy
+--- FAIL: TestApproval_UnhealthyRunBlocks (0.03s)
+    service_test.go:104: approved although a ring-0 run was not healthy: {Fingerprint:5088e82274a46ef8 FirstSeen:2026-10-04 12:00:00 +0000 UTC Packages:1 Waiting:}
+== mutation: nights
+--- FAIL: TestApproval_WaitHealthyAndOneNight (0.03s)
+    service_test.go:70: approved without a night run: {Fingerprint:8415f8a9ec63c815 FirstSeen:2026-10-04 12:00:00 +0000 UTC Packages:2 Waiting:}
+== mutation: origin
+--- FAIL: TestCandidate_OnlyDebianOrigins (0.03s)
+    service_test.go:140: a Docker package entered the candidate
+== mutation: agree
+--- FAIL: TestCandidate_DisagreementLeftOut (0.03s)
+    service_test.go:128: candidate = map[curl:{Name:curl Version:8.14.1-2+deb13u5 Origin:Debian} libc6:{Name:libc6 Version:2.41-12+deb13u4 Origin:Debian}]
+== reverted
+ok  	gitea.dooplex.hu/admin/felhom-hub/internal/osupdates	(cached)
diff --git a/documentation/audits/os-guest-lane-2026-10-04/partE/r726-redproof.txt b/documentation/audits/os-guest-lane-2026-10-04/partE/r726-redproof.txt
new file mode 100644
index 00000000..7cd1d347
--- /dev/null
+++ b/documentation/audits/os-guest-lane-2026-10-04/partE/r726-redproof.txt
@@ -0,0 +1,11 @@
+# controller R-726 (decision 78) red-proof, 2026-10-04
+== mutation: drop the first-night condition
+--- FAIL: TestR726_ReturningHouseholdFirstNightSetsAside (0.00s)
+    offbox_orphan_test.go:204: the returning household's box stayed orphaned
+FAIL	gitea.dooplex.hu/admin/felhom-controller/internal/backup	0.014s
+== mutation: first night = any claimed box (ignore LastSuccess)
+--- FAIL: TestOffbox_OrphanDetection_Claimed (10.10s)
+    offbox_orphan_test.go:81: expected exactly one offbox_repo_orphaned event, got [offbox_repo_orphaned offbox_repo_orphaned]
+FAIL	gitea.dooplex.hu/admin/felhom-controller/internal/backup	10.113s
+== reverted
+ok  	gitea.dooplex.hu/admin/felhom-controller/internal/backup	0.015s
diff --git a/documentation/audits/os-guest-lane-2026-10-04/partF/redproof.txt b/documentation/audits/os-guest-lane-2026-10-04/partF/redproof.txt
new file mode 100644
index 00000000..767f82d5
--- /dev/null
+++ b/documentation/audits/os-guest-lane-2026-10-04/partF/redproof.txt
@@ -0,0 +1,6 @@
+# controller R-838 red-proof, 2026-10-04
+== mutation: a running file browser is left alone again (the pre-fix behaviour)
+    infra_tunnel_test.go:275: compose after the move:
+FAIL	gitea.dooplex.hu/admin/felhom-controller/internal/stacks	0.009s
+== reverted
+ok  	gitea.dooplex.hu/admin/felhom-controller/internal/stacks	0.011s
diff --git a/hub/CHANGELOG.md b/hub/CHANGELOG.md
index 753579e3..cd826b14 100644
--- a/hub/CHANGELOG.md
+++ b/hub/CHANGELOG.md
@@ -1,3 +1,23 @@
+## v0.130.0 — OS updates, guest fast lane: rings, the per-box switch, OS releases approved from ring 0 (`11` §8 step 2)
+
+- **The OS release.** Ring-0 boxes (the demo boxes) report every OS-leg run to `POST /api/v1/hosts/{id}/os-report`
+  (per-host key, self-scoped) with the FULL installed set (`11` C9). The CANDIDATE is every `Debian` /
+  `Debian-Security` package=version that all ring-0 boxes having it agree on (a disagreement is left out). It is
+  APPROVED when, since first seen, `OS_APPROVE_AFTER` (24 h) has passed with every ring-0 report healthy and every
+  ring-0 box has `OS_APPROVE_NIGHTS` (1) post-backup night runs. Either override is a TEST configuration, logged at
+  start. The approval time is the snapshot.debian.org timestamp (decision 79). Ring-1 boxes are nudged (desired
+  generation bump).
+- **The box's block.** `os_update {ring, enabled, release}` is merged into every desired-state document at read time
+  (like the wireguard block). Ring 1 gets the newest release; ring 0 none (it installs everything pending). Golden:
+  `internal/api/testdata/desired-state-osupdate.golden.json`, byte-identical with the agent's.
+- **Operator routes:** `POST /os/ring/<host>` (`ring=0|1`), `POST /os/enabled/<host>` (`on=0|1`, default ON),
+  `POST /os/approve-now` (an operator event), `GET /os/fleet` (one line per box: ring, switch, release, last outcome,
+  pending, not covered, restart-needed).
+- **Events:** `os_update_applied` (info, the household's line — recorded, not mailed; hu/en in the bundle),
+  `os_update_failed` and `os_update_health_failed` (error, operator — mailed), `os_release_approved`,
+  `os_release_approved_now`, `os_update_settings_changed` (operator).
+- Tests `internal/osupdates/service_test.go` (5 approval-rule red-proofs), `internal/api/os_updates_test.go`.
+
 ## v0.129.0 — the operator can raise ONE clean-up window's cap after a long gap (R-833)
 
 - After weeks without windows the honest backlog exceeds half the snapshots, and the box's guard refuses every window
diff --git a/hub/cmd/hub/main.go b/hub/cmd/hub/main.go
index 56f8d04f..08cd7e81 100644
--- a/hub/cmd/hub/main.go
+++ b/hub/cmd/hub/main.go
@@ -25,6 +25,7 @@ import (
 	"gitea.dooplex.hu/admin/felhom-hub/internal/offsite"
 	"gitea.dooplex.hu/admin/felhom-hub/internal/offsiteheal"
 	"gitea.dooplex.hu/admin/felhom-hub/internal/offsitekeys"
+	"gitea.dooplex.hu/admin/felhom-hub/internal/osupdates"
 	"gitea.dooplex.hu/admin/felhom-hub/internal/pbsdrheal"
 	"gitea.dooplex.hu/admin/felhom-hub/internal/poke"
 	"gitea.dooplex.hu/admin/felhom-hub/internal/store"
@@ -384,6 +385,57 @@ func main() {
 	// unconfigured or the customer has no offsite tier.
 	apiHandler.SetOffsiteReissuer(webServer.ReissueOffsiteForCustomer)
 
+	// OS updates, guest fast lane (hub v0.130.0, `11` §8 step 2). A release is approved when every ring-0 box runs the
+	// set, healthy, for OS_APPROVE_AFTER (default 24h) and through OS_APPROVE_NIGHTS night runs (default 1) — the
+	// ruled "1–2 day wait". Either override is a TEST configuration and is logged loudly.
+	osSvc := &osupdates.Service{Store: dataStore, Emit: dispatcher.ProcessEvent, Logger: logger,
+		ApproveAfter: 24 * time.Hour, NightsRequired: 1,
+		Bump: func(hostID string) {
+			if _, err := dataStore.BumpHostDesired(hostID); err != nil {
+				logger.Printf("[WARN] osupdates: bump desired for %s: %v", hostID, err)
+			}
+		}}
+	if v := os.Getenv("OS_APPROVE_AFTER"); v != "" {
+		if d, derr := time.ParseDuration(v); derr == nil && d >= 0 {
+			osSvc.ApproveAfter = d
+			logger.Printf("[WARN] OS_APPROVE_AFTER=%s — OS releases approve after %s instead of 24h (TEST CONFIGURATION)", v, d)
+		} else {
+			logger.Printf("[ERROR] OS_APPROVE_AFTER=%q invalid — keeping 24h", v)
+		}
+	}
+	if v := os.Getenv("OS_APPROVE_NIGHTS"); v != "" {
+		if n, nerr := strconv.Atoi(v); nerr == nil && n >= 0 {
+			osSvc.NightsRequired = n
+			logger.Printf("[WARN] OS_APPROVE_NIGHTS=%s — OS releases need %d night run(s) instead of 1 (TEST CONFIGURATION)", v, n)
+		} else {
+			logger.Printf("[ERROR] OS_APPROVE_NIGHTS=%q invalid — keeping 1", v)
+		}
+	}
+	logger.Printf("[INFO] osupdates: approval rule = every ring-0 box healthy for %s and %d night run(s)", osSvc.ApproveAfter, osSvc.NightsRequired)
+	apiHandler.SetOSUpdateService(osSvc)
+	webServer.SetOSUpdateAdmin(osSvc)
+	go func() {
+		tk := time.NewTicker(60 * time.Second)
+		defer tk.Stop()
+		last := ""
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-tk.C:
+				st, err := osSvc.Evaluate()
+				if err != nil {
+					logger.Printf("[WARN] osupdates: evaluate: %v", err)
+					continue
+				}
+				if msg := st.Fingerprint + "|" + st.Waiting; msg != last {
+					last = msg
+					logger.Printf("[INFO] osupdates: candidate %s (%d packages, first seen %s): %s", st.Fingerprint, st.Packages, st.FirstSeen.UTC().Format(time.RFC3339), map[bool]string{true: "approved / nothing to wait for", false: "waiting — " + st.Waiting}[st.Waiting == ""])
+				}
+			}
+		}
+	}()
+
 	// Decision 69 (v0.127.0): the off-site KEY REGISTRAR. The box sends its public key; the hub writes it
 	// into the sub-account's authorized_keys pinned append-only; the daily check reads every file.
 	if offsiteKeyReady {
diff --git a/hub/internal/api/handler.go b/hub/internal/api/handler.go
index d2338821..9ef39b02 100644
--- a/hub/internal/api/handler.go
+++ b/hub/internal/api/handler.go
@@ -50,6 +50,7 @@ type Poker interface {
 type Handler struct {
 	store            *store.Store
 	offsiteKeys      OffsiteKeyService // decision 69 key registrar (nil → 503)
+	osUpdates        OSUpdateService   // `11` §8 step 2, the guest fast lane (nil → 503, no block merged)
 	apiKey           string
 	resendAPIKey     string
 	fromEmail        string
@@ -288,6 +289,10 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	case r.Method == http.MethodPost && strings.HasPrefix(path, "/hosts/") && strings.HasSuffix(path, "/pbs/consume-token"):
 		hostID := strings.TrimSuffix(strings.TrimPrefix(path, "/hosts/"), "/pbs/consume-token")
 		h.handleConsumePBSToken(w, r, hostID)
+	// OS updates (hub v0.130.0): the agent's report after every OS-leg run — per-host key, self-scoped.
+	case r.Method == http.MethodPost && strings.HasPrefix(path, "/hosts/") && strings.HasSuffix(path, "/os-report"):
+		hostID := strings.TrimSuffix(strings.TrimPrefix(path, "/hosts/"), "/os-report")
+		h.handleOSReport(w, r, hostID)
 	// Desired-state serving (slice 10A) — per-host-key, self-scoped (a host reads only its own).
 	case r.Method == http.MethodGet && strings.HasPrefix(path, "/hosts/") && strings.HasSuffix(path, "/desired-state"):
 		hostID := strings.TrimSuffix(strings.TrimPrefix(path, "/hosts/"), "/desired-state")
@@ -1747,6 +1752,7 @@ func (h *Handler) handleGetDesiredState(w http.ResponseWriter, r *http.Request,
 	// S2: merge the hub-OWNED wireguard block at read time (no peer → pass-through unchanged;
 	// the stored operator blob is never modified). See api/wg.go mergeWireguard.
 	desired = h.mergeWireguard(pathHostID, desired)
+	desired = h.mergeOSUpdate(pathHostID, desired)
 	resp := map[string]interface{}{
 		"generation":    host.DesiredGeneration,
 		"desired_state": json.RawMessage(desired), // opaque to the hub — agent owns the schema
diff --git a/hub/internal/api/os_updates.go b/hub/internal/api/os_updates.go
new file mode 100644
index 00000000..a669c4e5
--- /dev/null
+++ b/hub/internal/api/os_updates.go
@@ -0,0 +1,71 @@
+package api
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+
+	"gitea.dooplex.hu/admin/felhom-hub/internal/osupdates"
+)
+
+// OSUpdateService is the hub half of the guest fast lane (`11` §8 step 2; hub v0.130.0).
+type OSUpdateService interface {
+	Ingest(hostID string, r osupdates.Report) error
+	DesiredBlock(hostID string) osupdates.Block
+}
+
+// SetOSUpdateService wires the OS-update service. nil → the report endpoint answers 503 and no block is merged.
+func (h *Handler) SetOSUpdateService(s OSUpdateService) { h.osUpdates = s }
+
+// handleOSReport: POST /api/v1/hosts/{id}/os-report — the agent's report after every OS-leg run. Per-host key,
+// SELF-SCOPED (a host reports only for itself).
+func (h *Handler) handleOSReport(w http.ResponseWriter, r *http.Request, pathHostID string) {
+	authHostID, _, isGlobal, ok := h.checkAuthHost(r)
+	if !ok {
+		http.Error(w, "Unauthorized", http.StatusUnauthorized)
+		return
+	}
+	if pathHostID == "" || (!isGlobal && authHostID != pathHostID) {
+		http.Error(w, "Forbidden: host_id mismatch", http.StatusForbidden)
+		return
+	}
+	if h.osUpdates == nil {
+		http.Error(w, "os updates not configured", http.StatusServiceUnavailable)
+		return
+	}
+	body, err := io.ReadAll(io.LimitReader(r.Body, 4<<20))
+	if err != nil {
+		http.Error(w, "read error", http.StatusBadRequest)
+		return
+	}
+	var rep osupdates.Report
+	if err := json.Unmarshal(body, &rep); err != nil || rep.RunID == "" {
+		http.Error(w, "body must be an os report with run_id", http.StatusBadRequest)
+		return
+	}
+	if err := h.osUpdates.Ingest(pathHostID, rep); err != nil {
+		h.logger.Printf("[WARN] os-report from %s: %v", pathHostID, err)
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"ok": true})
+}
+
+// mergeOSUpdate adds the hub-OWNED `os_update` block to a host's desired state at read time (like
+// mergeWireguard): the stored operator blob is never modified. No service → pass-through unchanged.
+func (h *Handler) mergeOSUpdate(hostID, desired string) string {
+	if h.osUpdates == nil {
+		return desired
+	}
+	var doc map[string]interface{}
+	if err := json.Unmarshal([]byte(desired), &doc); err != nil {
+		h.logger.Printf("[ERROR] os_update merge %s: stored desired_json unparsable: %v (serving unmerged)", hostID, err)
+		return desired
+	}
+	doc["os_update"] = h.osUpdates.DesiredBlock(hostID)
+	out, err := json.Marshal(doc)
+	if err != nil {
+		return desired
+	}
+	return string(out)
+}
diff --git a/hub/internal/api/os_updates_test.go b/hub/internal/api/os_updates_test.go
new file mode 100644
index 00000000..04aad426
--- /dev/null
+++ b/hub/internal/api/os_updates_test.go
@@ -0,0 +1,83 @@
+package api
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"os"
+	"testing"
+	"time"
+
+	"gitea.dooplex.hu/admin/felhom-hub/internal/osupdates"
+	"gitea.dooplex.hu/admin/felhom-hub/internal/store"
+)
+
+// The os_update block a box receives is a contract DUPLICATED with felhom-agent:
+// testdata/desired-state-osupdate.golden.json MUST stay byte-identical with the agent's
+// internal/hub/testdata copy (the agent's test decodes it). This test proves the hub SERVES exactly that shape.
+func TestOSUpdate_DesiredBlockMatchesTheGolden(t *testing.T) {
+	h, st, _ := newTestHandler(t)
+	seedHost(t, st, "h1", "c1", "HKEY1")
+	svc := &osupdates.Service{Store: st, ApproveAfter: 0, NightsRequired: 0, Logger: log.New(os.Stderr, "", 0)}
+	h.SetOSUpdateService(svc)
+	rel := `[{"name":"libc6","version":"2.41-12+deb13u4","origin":"Debian"},{"name":"openssl","version":"3.5.7-1~deb13u3","origin":"Debian-Security"}]`
+	if err := st.SaveOSRelease(storeRelease("os-20261004-120000", rel)); err != nil {
+		t.Fatal(err)
+	}
+	rr := do(h, http.MethodGet, "/hosts/h1/desired-state", "HKEY1", "")
+	if rr.Code != 200 {
+		t.Fatalf("GET desired-state: %d", rr.Code)
+	}
+	var got struct {
+		DesiredState struct {
+			OSUpdate json.RawMessage `json:"os_update"`
+		} `json:"desired_state"`
+	}
+	json.Unmarshal(rr.Body.Bytes(), &got)
+	raw, err := os.ReadFile("testdata/desired-state-osupdate.golden.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var golden struct {
+		DesiredState struct {
+			OSUpdate json.RawMessage `json:"os_update"`
+		} `json:"desired_state"`
+	}
+	if err := json.Unmarshal(raw, &golden); err != nil {
+		t.Fatal(err)
+	}
+	var a, b any
+	json.Unmarshal(got.DesiredState.OSUpdate, &a)
+	json.Unmarshal(golden.DesiredState.OSUpdate, &b)
+	ab, _ := json.Marshal(a)
+	bb, _ := json.Marshal(b)
+	if string(ab) != string(bb) {
+		t.Fatalf("served os_update diverged from the golden:\n served: %s\n golden: %s", ab, bb)
+	}
+}
+
+// A box reports only for itself; another box's key is refused and nothing is stored.
+func TestOSReport_SelfScoped(t *testing.T) {
+	h, st, _ := newTestHandler(t)
+	seedHost(t, st, "h1", "c1", "HKEY1")
+	seedHost(t, st, "h2", "c2", "HKEY2")
+	h.SetOSUpdateService(&osupdates.Service{Store: st})
+	body := `{"run_id":"r1","trigger":"night","mode":"apply","outcome":"applied","healthy":true,"upgraded":[{"name":"libc6","version":"x","origin":"Debian"}]}`
+	if rr := do(h, http.MethodPost, "/hosts/h1/os-report", "HKEY2", body); rr.Code != http.StatusForbidden {
+		t.Fatalf("cross-host report → %d, want 403", rr.Code)
+	}
+	if r, _ := st.LatestOSReport("h1"); r != nil {
+		t.Fatal("a refused report was stored")
+	}
+	if rr := do(h, http.MethodPost, "/hosts/h1/os-report", "HKEY1", body); rr.Code != http.StatusOK {
+		t.Fatalf("own report → %d %s", rr.Code, rr.Body.String())
+	}
+	if r, _ := st.LatestOSReport("h1"); r == nil || r.Outcome != "applied" {
+		t.Fatalf("report not stored: %+v", r)
+	}
+}
+
+func storeRelease(id, pkgs string) store.OSRelease {
+	at, _ := time.Parse(time.RFC3339, "2026-10-04T12:00:00Z")
+	return store.OSRelease{ID: id, Fingerprint: "fp", ApprovedAt: at, ApprovedBy: "auto", PackagesJSON: pkgs}
+}
diff --git a/hub/internal/api/testdata/desired-state-osupdate.golden.json b/hub/internal/api/testdata/desired-state-osupdate.golden.json
new file mode 100644
index 00000000..da28c48c
--- /dev/null
+++ b/hub/internal/api/testdata/desired-state-osupdate.golden.json
@@ -0,0 +1,17 @@
+{
+  "generation": 1,
+  "desired_state": {
+    "os_update": {
+      "ring": 1,
+      "enabled": true,
+      "release": {
+        "id": "os-20261004-120000",
+        "snapshot": "20261004T120000Z",
+        "packages": [
+          {"name": "libc6", "version": "2.41-12+deb13u4", "origin": "Debian"},
+          {"name": "openssl", "version": "3.5.7-1~deb13u3", "origin": "Debian-Security"}
+        ]
+      }
+    }
+  }
+}
diff --git a/hub/internal/i18n/locales/en.json b/hub/internal/i18n/locales/en.json
index 3b9e7d43..e47a1f4c 100644
--- a/hub/internal/i18n/locales/en.json
+++ b/hub/internal/i18n/locales/en.json
@@ -86,5 +86,6 @@
   "bind.resend.hint": "If this was your link and your box is not linked yet, we send a fresh link to the e-mail address you gave Felhom.",
   "bind.resend.button": "Send me a new link",
   "bind.resent.lead": "Done.",
-  "bind.resent.body": "If this was a real link and your box is not linked yet, a new e-mail reaches your registered address within a few minutes. If it does not, contact support."
+  "bind.resent.body": "If this was a real link and your box is not linked yet, a new e-mail reaches your registered address within a few minutes. If it does not, contact support.",
+  "mail.event.os_update_applied": "System security fixes were installed on your box. You do not need to do anything."
 }
diff --git a/hub/internal/i18n/locales/hu.json b/hub/internal/i18n/locales/hu.json
index b40efafe..90dee775 100644
--- a/hub/internal/i18n/locales/hu.json
+++ b/hub/internal/i18n/locales/hu.json
@@ -86,5 +86,6 @@
   "bind.resend.hint": "Ha ez a te linked volt, és a dobozod még nincs összekötve, új linket küldünk arra az e-mail címre, amelyet a Felhomnál megadtál.",
   "bind.resend.button": "Új linket kérek",
   "bind.resent.lead": "Kész.",
-  "bind.resent.body": "Ha ez egy valódi hivatkozás volt, és a dobozod még nincs összekötve, néhány percen belül új e-mailt kapsz a regisztrált címedre. Ha nem jön, szólj az ügyfélszolgálatnak."
+  "bind.resent.body": "Ha ez egy valódi hivatkozás volt, és a dobozod még nincs összekötve, néhány percen belül új e-mailt kapsz a regisztrált címedre. Ha nem jön, szólj az ügyfélszolgálatnak.",
+  "mail.event.os_update_applied": "Rendszerbiztonsági javítások telepítve a dobozodra. Ehhez nem kell semmit tenned."
 }
diff --git a/hub/internal/notify/dispatcher.go b/hub/internal/notify/dispatcher.go
index 3c54954a..d222965a 100644
--- a/hub/internal/notify/dispatcher.go
+++ b/hub/internal/notify/dispatcher.go
@@ -680,6 +680,13 @@ var operatorOnlyEvents = map[string]bool{
 	"offsite_prune_guard_refused": true,
 	// R-833 (v0.129.0): the operator raised ONE window's removal cap — an operator act, logged.
 	"offsite_window_large_grant": true,
+	// OS updates (hub v0.130.0, `11` §8 step 2): run failures, rings, switches and approvals are operator facts.
+	// os_update_applied is deliberately NOT here — it is the household's one line (info: recorded, never mailed).
+	"os_update_failed":           true,
+	"os_update_health_failed":    true,
+	"os_release_approved":        true,
+	"os_release_approved_now":    true,
+	"os_update_settings_changed": true,
 	// R-197 (v0.93.0). "The sealed offsite repository key changed" is a custody fact about escrow
 	// blobs. A customer can take no action on it — the remedy is the operator's inspection of the
 	// off-site tier — and the text is operator-grade English naming host ids and retained-blob
diff --git a/hub/internal/notify/testdata/mail_goldens/en/customer_event_os_update_applied.txt b/hub/internal/notify/testdata/mail_goldens/en/customer_event_os_update_applied.txt
new file mode 100644
index 00000000..6a00c7bc
--- /dev/null
+++ b/hub/internal/notify/testdata/mail_goldens/en/customer_event_os_update_applied.txt
@@ -0,0 +1,18 @@
+SUBJECT: [Felhom] Warning: System security fixes were installed on your box. You do not need to do anything.
+---
+Dear Customer,
+
+Your Felhom system sent the following notification:
+
+System security fixes were installed on your box. You do not need to do anything.
+
+Details:
+- Server: demo-fixture
+- Time: 2026-01-15 10:30
+- Level: Warning
+- Type: os_update_applied
+
+If you have any questions, contact your operator.
+
+Best regards,
+Felhom.eu monitoring
diff --git a/hub/internal/notify/testdata/mail_goldens/hu/customer_event_os_update_applied.txt b/hub/internal/notify/testdata/mail_goldens/hu/customer_event_os_update_applied.txt
new file mode 100644
index 00000000..45cc05b6
--- /dev/null
+++ b/hub/internal/notify/testdata/mail_goldens/hu/customer_event_os_update_applied.txt
@@ -0,0 +1,18 @@
+SUBJECT: [Felhom] Figyelmeztetés: Rendszerbiztonsági javítások telepítve a dobozodra. Ehhez nem kell semmit tenned.
+---
+Kedves Ügyfél!
+
+A Felhom rendszered a következő értesítést küldte:
+
+Rendszerbiztonsági javítások telepítve a dobozodra. Ehhez nem kell semmit tenned.
+
+Részletek:
+- Szerver: demo-fixture
+- Időpont: 2026-01-15 10:30
+- Szint: Figyelmeztetés
+- Típus: os_update_applied
+
+Ha kérdésed van, vedd fel a kapcsolatot az üzemeltetővel.
+
+Üdvözlettel,
+Felhom.eu monitoring
diff --git a/hub/internal/osupdates/service.go b/hub/internal/osupdates/service.go
new file mode 100644
index 00000000..c0fd1d02
--- /dev/null
+++ b/hub/internal/osupdates/service.go
@@ -0,0 +1,436 @@
+// Package osupdates is the hub half of the guest fast lane (`11-os-updates.md` §5.3, §8 step 2; hub v0.130.0).
+//
+// Ring 0 (the demo boxes) installs every pending Debian / Debian-Security fix each night and reports the FULL installed
+// set (C9). The hub derives the CANDIDATE: every Debian-origin package=version that all ring-0 boxes having that
+// package agree on. A candidate is APPROVED when, since it was first seen:
+//   - every ring-0 box runs it (its newest report matches the candidate for every package it has),
+//   - ApproveAfter (default 24 h) has passed with every ring-0 report healthy, and
+//   - every ring-0 box has completed NightsRequired (default 1) post-backup night runs.
+//
+// The operator can approve at once ("approve now", an urgent fix). Ring 1 then gets the release in its desired state
+// and installs exactly those versions. Rules pinned by service_test.go.
+package osupdates
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"log"
+	"sort"
+	"strings"
+	"time"
+
+	"gitea.dooplex.hu/admin/felhom-hub/internal/store"
+)
+
+// Event types — operator-only except EventApplied, the household's line (`11` §5.7).
+const (
+	EventApplied        = "os_update_applied"          // info, CUSTOMER: "system security fixes installed"
+	EventFailed         = "os_update_failed"           // error, operator: the run failed or was refused
+	EventHealthFailed   = "os_update_health_failed"    // error, operator: the guest was not healthy after the run
+	EventReleaseApprove = "os_release_approved"        // info, operator
+	EventApprovedNow    = "os_release_approved_now"    // warning, operator: an operator approved at once
+	EventSettings       = "os_update_settings_changed" // info, operator: ring or switch changed
+)
+
+// Package is one name=version with its origin ("Debian" | "Debian-Security").
+type Package struct {
+	Name    string `json:"name"`
+	Version string `json:"version"`
+	Origin  string `json:"origin"`
+}
+
+// Report is what the agent POSTs after every run (the wrapper's report plus the leg's verdict).
+type Report struct {
+	RunID               string          `json:"run_id"`
+	Trigger             string          `json:"trigger"` // night | debug
+	Mode                string          `json:"mode"`    // apply | inventory
+	Ring                int             `json:"ring"`
+	ReleaseID           string          `json:"release_id"`
+	Outcome             string          `json:"outcome"` // applied | nothing | inventory | refused | failed | health_failed
+	Healthy             bool            `json:"healthy"`
+	HealthReason        string          `json:"health_reason,omitempty"`
+	VMID                int             `json:"vmid"`
+	Upgraded            []Package       `json:"upgraded,omitempty"`
+	Installed           []Package       `json:"installed,omitempty"`
+	Pending             []PendingPkg    `json:"pending,omitempty"`
+	NotCovered          []string        `json:"not_covered,omitempty"`
+	RestartNeeded       []string        `json:"restart_needed,omitempty"`
+	DockerRestartNeeded bool            `json:"docker_restart_needed,omitempty"`
+	RebootNeeded        bool            `json:"reboot_needed,omitempty"`
+	Refused             json.RawMessage `json:"refused,omitempty"`
+	Log                 []string        `json:"log,omitempty"`
+}
+
+// PendingPkg is one update the guest's sources offer.
+type PendingPkg struct {
+	Name   string   `json:"name"`
+	From   string   `json:"from"`
+	To     string   `json:"to"`
+	Origin []string `json:"origin"`
+}
+
+// Block is what a box receives in its desired state (`os_update`).
+type Block struct {
+	Ring    int           `json:"ring"`
+	Enabled bool          `json:"enabled"`
+	Release *ReleaseBlock `json:"release,omitempty"`
+}
+
+// ReleaseBlock is the newest approved release, for ring 1.
+type ReleaseBlock struct {
+	ID       string    `json:"id"`
+	Snapshot string    `json:"snapshot"` // approval time as YYYYMMDDTHHMMSSZ (decision 79: snapshot.debian.org)
+	Packages []Package `json:"packages"`
+}
+
+// Service ties the store, the events and the clock together.
+type Service struct {
+	Store          *store.Store
+	Emit           func(customerID, eventType, severity, message, details, source string) // dispatcher; nil in tests
+	ApproveAfter   time.Duration
+	NightsRequired int
+	Logger         *log.Logger
+	Now            func() time.Time
+	Bump           func(hostID string) // bump a host's desired generation (store.BumpHostDesired); nil in tests
+}
+
+func (s *Service) now() time.Time {
+	if s.Now != nil {
+		return s.Now()
+	}
+	return time.Now()
+}
+
+func (s *Service) logf(f string, a ...any) {
+	if s.Logger != nil {
+		s.Logger.Printf(f, a...)
+	}
+}
+
+func (s *Service) event(customerID, typ, sev, msg string, details any) {
+	dj := ""
+	if details != nil {
+		if b, err := json.Marshal(details); err == nil {
+			dj = string(b)
+		}
+	}
+	if _, err := s.Store.SaveEvent(customerID, typ, sev, msg, dj, "hub"); err != nil {
+		s.logf("[WARN] osupdates: save event %s: %v", typ, err)
+	}
+	if s.Emit != nil {
+		s.Emit(customerID, typ, sev, msg, dj, "hub")
+	}
+}
+
+// Ingest stores a run and raises its events. The household gets one line per run that installed something.
+func (s *Service) Ingest(hostID string, r Report) error {
+	h, err := s.Store.GetHost(hostID)
+	if err != nil || h == nil {
+		return fmt.Errorf("osupdates: unknown host %q", hostID)
+	}
+	raw, _ := json.Marshal(r)
+	if _, err := s.Store.SaveOSReport(store.OSReport{HostID: hostID, ReceivedAt: s.now(), Trigger: r.Trigger, Mode: r.Mode, Outcome: r.Outcome,
+		Healthy: r.Healthy, ReleaseID: r.ReleaseID, ReportJSON: string(raw)}); err != nil {
+		return err
+	}
+	s.logf("[INFO] osupdates: %s reported run %s: ring=%d mode=%s outcome=%s healthy=%v upgraded=%d pending=%d not-covered=%d restart-needed=%d",
+		hostID, r.RunID, r.Ring, r.Mode, r.Outcome, r.Healthy, len(r.Upgraded), len(r.Pending), len(r.NotCovered), len(r.RestartNeeded))
+	details := map[string]any{"host_id": hostID, "run_id": r.RunID, "ring": r.Ring, "outcome": r.Outcome,
+		"upgraded": len(r.Upgraded), "release_id": r.ReleaseID, "health_reason": r.HealthReason}
+	switch r.Outcome {
+	case "applied", "health_failed":
+		s.event(h.CustomerID, EventApplied, "info",
+			fmt.Sprintf("System security fixes installed (%d package(s)).", len(r.Upgraded)), details)
+		if !r.Healthy || r.Outcome == "health_failed" {
+			s.event(h.CustomerID, EventHealthFailed, "error",
+				fmt.Sprintf("OS update on %s: the guest was NOT healthy after %d package(s) were installed (%s). Nothing was undone automatically (no guest snapshot is possible, R-837); last night's whole-guest backup is the undo.",
+					hostID, len(r.Upgraded), r.HealthReason), details)
+		}
+	case "refused", "failed":
+		s.event(h.CustomerID, EventFailed, "error",
+			fmt.Sprintf("OS update on %s %s: %s", hostID, r.Outcome, strings.TrimSpace(string(r.Refused)+" "+r.HealthReason)), details)
+	}
+	return nil
+}
+
+// candidate derives the version set every ring-0 box agrees on, from each box's newest report.
+func (s *Service) candidate(ring0 []string) (map[string]Package, map[string]*store.OSReport, error) {
+	latest := map[string]*store.OSReport{}
+	byPkg := map[string]map[string]Package{} // name -> host -> pkg
+	for _, h := range ring0 {
+		rep, err := s.Store.LatestOSReport(h)
+		if err != nil {
+			return nil, nil, err
+		}
+		if rep == nil {
+			return nil, nil, nil // a ring-0 box that never reported: no candidate
+		}
+		latest[h] = rep
+		var r Report
+		if err := json.Unmarshal([]byte(rep.ReportJSON), &r); err != nil {
+			return nil, nil, err
+		}
+		for _, p := range r.Installed {
+			if p.Origin != "Debian" && p.Origin != "Debian-Security" {
+				continue
+			}
+			if byPkg[p.Name] == nil {
+				byPkg[p.Name] = map[string]Package{}
+			}
+			byPkg[p.Name][h] = p
+		}
+	}
+	cand := map[string]Package{}
+	for name, hosts := range byPkg {
+		var v string
+		agree := true
+		var pick Package
+		for _, p := range hosts {
+			if v == "" {
+				v, pick = p.Version, p
+			} else if p.Version != v {
+				agree = false
+			}
+		}
+		if agree {
+			cand[name] = pick
+		}
+	}
+	return cand, latest, nil
+}
+
+func fingerprint(c map[string]Package) (string, []Package) {
+	var list []Package
+	for _, p := range c {
+		list = append(list, p)
+	}
+	sort.Slice(list, func(i, j int) bool { return list[i].Name < list[j].Name })
+	h := sha256.New()
+	for _, p := range list {
+		fmt.Fprintf(h, "%s=%s\n", p.Name, p.Version)
+	}
+	return hex.EncodeToString(h.Sum(nil))[:16], list
+}
+
+// ring0Hosts lists the ring-0 boxes that have the switch ON.
+func (s *Service) ring0Hosts() ([]string, error) {
+	hosts, err := s.Store.ListHosts()
+	if err != nil {
+		return nil, err
+	}
+	var out []string
+	for _, h := range hosts {
+		if st := s.Store.GetOSHostSettings(h.HostID); st.Ring == 0 && st.Enabled {
+			out = append(out, h.HostID)
+		}
+	}
+	sort.Strings(out)
+	return out, nil
+}
+
+// Status explains the approval state (for the log and the fleet page).
+type Status struct {
+	Fingerprint string
+	FirstSeen   time.Time
+	Packages    int
+	Waiting     string // why not approved yet ("" = approved or nothing to do)
+}
+
+// Evaluate checks the approval rule and approves when it holds. Called every minute.
+func (s *Service) Evaluate() (Status, error) {
+	ring0, err := s.ring0Hosts()
+	if err != nil || len(ring0) == 0 {
+		return Status{Waiting: "no ring-0 box"}, err
+	}
+	cand, _, err := s.candidate(ring0)
+	if err != nil || cand == nil {
+		return Status{Waiting: "a ring-0 box has not reported"}, err
+	}
+	fp, list := fingerprint(cand)
+	pj, _ := json.Marshal(list)
+	first, err := s.Store.OSCandidateFirstSeen(fp, string(pj), s.now())
+	if err != nil {
+		return Status{}, err
+	}
+	st := Status{Fingerprint: fp, FirstSeen: first, Packages: len(list)}
+	if rel, _ := s.Store.LatestOSRelease(); rel != nil && rel.Fingerprint == fp {
+		st.Waiting = ""
+		return st, nil // already approved
+	}
+	if age := s.now().Sub(first); age < s.ApproveAfter {
+		st.Waiting = fmt.Sprintf("healthy for %s of %s", age.Round(time.Minute), s.ApproveAfter)
+		return st, nil
+	}
+	for _, h := range ring0 {
+		reps, err := s.Store.OSReportsSince(h, first)
+		if err != nil {
+			return st, err
+		}
+		nights := 0
+		for _, r := range reps {
+			if !r.Healthy || r.Outcome == "failed" || r.Outcome == "refused" || r.Outcome == "health_failed" {
+				st.Waiting = fmt.Sprintf("%s reported %s (healthy=%v) at %s since the set was first seen", h, r.Outcome, r.Healthy, r.ReceivedAt.UTC().Format(time.RFC3339))
+				return st, nil
+			}
+			if r.Trigger == "night" {
+				nights++
+			}
+		}
+		if nights < s.NightsRequired {
+			st.Waiting = fmt.Sprintf("%s has %d of %d night run(s) since the set was first seen", h, nights, s.NightsRequired)
+			return st, nil
+		}
+	}
+	if err := s.approve(fp, list, "auto"); err != nil {
+		return st, err
+	}
+	return st, nil
+}
+
+// ApproveNow approves the current candidate at once (operator, urgent fix).
+func (s *Service) ApproveNow() (string, error) {
+	ring0, err := s.ring0Hosts()
+	if err != nil || len(ring0) == 0 {
+		return "", fmt.Errorf("osupdates: no ring-0 box")
+	}
+	cand, _, err := s.candidate(ring0)
+	if err != nil || cand == nil {
+		return "", fmt.Errorf("osupdates: a ring-0 box has not reported yet")
+	}
+	fp, list := fingerprint(cand)
+	pj, _ := json.Marshal(list)
+	if _, err := s.Store.OSCandidateFirstSeen(fp, string(pj), s.now()); err != nil {
+		return "", err
+	}
+	if rel, _ := s.Store.LatestOSRelease(); rel != nil && rel.Fingerprint == fp {
+		return rel.ID, nil
+	}
+	if err := s.approve(fp, list, "operator"); err != nil {
+		return "", err
+	}
+	rel, _ := s.Store.LatestOSRelease()
+	s.event("", EventApprovedNow, "warning", fmt.Sprintf("The operator approved OS release %s at once (%d packages), without the wait.", rel.ID, len(list)),
+		map[string]any{"release_id": rel.ID, "packages": len(list)})
+	return rel.ID, nil
+}
+
+func (s *Service) approve(fp string, list []Package, by string) error {
+	at := s.now().UTC().Truncate(time.Second)
+	id := "os-" + at.Format("20060102-150405")
+	pj, _ := json.Marshal(list)
+	if err := s.Store.SaveOSRelease(store.OSRelease{ID: id, Fingerprint: fp, ApprovedAt: at, ApprovedBy: by, PackagesJSON: string(pj)}); err != nil {
+		return err
+	}
+	s.logf("[WARN] osupdates: OS release %s APPROVED by %s (%d packages, fingerprint %s)", id, by, len(list), fp)
+	s.event("", EventReleaseApprove, "info", fmt.Sprintf("OS release %s approved (%s, %d packages).", id, by, len(list)),
+		map[string]any{"release_id": id, "approved_by": by, "packages": len(list), "fingerprint": fp})
+	if s.Bump != nil {
+		hosts, _ := s.Store.ListHosts()
+		for _, h := range hosts {
+			if st := s.Store.GetOSHostSettings(h.HostID); st.Ring == 1 && st.Enabled {
+				s.Bump(h.HostID)
+			}
+		}
+	}
+	return nil
+}
+
+// DesiredBlock is the `os_update` block a box receives.
+func (s *Service) DesiredBlock(hostID string) Block {
+	st := s.Store.GetOSHostSettings(hostID)
+	b := Block{Ring: st.Ring, Enabled: st.Enabled}
+	if st.Ring == 1 {
+		if rel, err := s.Store.LatestOSRelease(); err == nil && rel != nil {
+			var list []Package
+			if json.Unmarshal([]byte(rel.PackagesJSON), &list) == nil {
+				b.Release = &ReleaseBlock{ID: rel.ID, Snapshot: rel.ApprovedAt.UTC().Format("20060102T150405Z"), Packages: list}
+			}
+		}
+	}
+	return b
+}
+
+// SetRing / SetEnabled are operator acts; each bumps the box's desired generation and is an operator event.
+func (s *Service) SetRing(hostID string, ring int) error {
+	if ring != 0 && ring != 1 {
+		return fmt.Errorf("osupdates: ring must be 0 or 1")
+	}
+	h, err := s.Store.GetHost(hostID)
+	if err != nil || h == nil {
+		return fmt.Errorf("osupdates: unknown host %q", hostID)
+	}
+	if err := s.Store.SetOSRing(hostID, ring); err != nil {
+		return err
+	}
+	s.event(h.CustomerID, EventSettings, "info", fmt.Sprintf("OS updates: %s is now ring %d.", hostID, ring), map[string]any{"host_id": hostID, "ring": ring})
+	if s.Bump != nil {
+		s.Bump(hostID)
+	}
+	return nil
+}
+
+func (s *Service) SetEnabled(hostID string, on bool) error {
+	h, err := s.Store.GetHost(hostID)
+	if err != nil || h == nil {
+		return fmt.Errorf("osupdates: unknown host %q", hostID)
+	}
+	if err := s.Store.SetOSEnabled(hostID, on); err != nil {
+		return err
+	}
+	s.event(h.CustomerID, EventSettings, "info", fmt.Sprintf("OS updates on %s switched %s.", hostID, map[bool]string{true: "ON", false: "OFF"}[on]),
+		map[string]any{"host_id": hostID, "enabled": on})
+	if s.Bump != nil {
+		s.Bump(hostID)
+	}
+	return nil
+}
+
+// FleetLine is one box on the fleet page.
+type FleetLine struct {
+	HostID        string
+	Ring          int
+	Enabled       bool
+	ReleaseID     string
+	LastOutcome   string
+	LastAt        time.Time
+	Pending       int
+	NotCovered    int
+	RestartNeeded int
+}
+
+// Fleet lists every box.
+func (s *Service) Fleet() ([]FleetLine, error) {
+	hosts, err := s.Store.ListHosts()
+	if err != nil {
+		return nil, err
+	}
+	var out []FleetLine
+	for _, h := range hosts {
+		st := s.Store.GetOSHostSettings(h.HostID)
+		l := FleetLine{HostID: h.HostID, Ring: st.Ring, Enabled: st.Enabled}
+		if rep, _ := s.Store.LatestOSReport(h.HostID); rep != nil {
+			var r Report
+			_ = json.Unmarshal([]byte(rep.ReportJSON), &r)
+			l.ReleaseID, l.LastOutcome, l.LastAt = r.ReleaseID, r.Outcome, rep.ReceivedAt
+			l.Pending, l.NotCovered, l.RestartNeeded = len(r.Pending), len(r.NotCovered), len(r.RestartNeeded)
+		}
+		out = append(out, l)
+	}
+	return out, nil
+}
+
+// FleetJSON is Fleet plus the approval status, for the operator's fleet route.
+func (s *Service) FleetJSON() (any, error) {
+	lines, err := s.Fleet()
+	if err != nil {
+		return nil, err
+	}
+	rel, _ := s.Store.LatestOSRelease()
+	out := map[string]any{"boxes": lines}
+	if rel != nil {
+		out["latest_release"] = map[string]any{"id": rel.ID, "approved_at": rel.ApprovedAt, "approved_by": rel.ApprovedBy}
+	}
+	return out, nil
+}
diff --git a/hub/internal/osupdates/service_test.go b/hub/internal/osupdates/service_test.go
new file mode 100644
index 00000000..0308f6e5
--- /dev/null
+++ b/hub/internal/osupdates/service_test.go
@@ -0,0 +1,189 @@
+package osupdates
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"gitea.dooplex.hu/admin/felhom-hub/internal/store"
+)
+
+type fix struct {
+	s      *Service
+	now    time.Time
+	events []string
+	bumps  []string
+}
+
+func newFix(t *testing.T) *fix {
+	t.Helper()
+	st, err := store.New(filepath.Join(t.TempDir(), "hub.db"), log.New(os.Stderr, "", 0))
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { st.Close() })
+	for _, h := range []struct{ host, cust string }{{"hp", "c-hp"}, {"n100", "c-n100"}, {"cust1", "c-1"}} {
+		if err := st.UpsertHost(&store.Host{HostID: h.host, CustomerID: h.cust, APIKey: "k-" + h.host}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	f := &fix{now: time.Date(2026, 10, 4, 12, 0, 0, 0, time.UTC)}
+	f.s = &Service{Store: st, ApproveAfter: 24 * time.Hour, NightsRequired: 1, Now: func() time.Time { return f.now },
+		Emit: func(_, typ, _, _, _, _ string) { f.events = append(f.events, typ) },
+		Bump: func(h string) { f.bumps = append(f.bumps, h) }}
+	_ = st.SetOSRing("hp", 0)
+	_ = st.SetOSRing("n100", 0)
+	return f
+}
+
+func pk(name, ver string) Package { return Package{Name: name, Version: ver, Origin: "Debian"} }
+
+func (f *fix) report(t *testing.T, host, trigger string, healthy bool, pkgs ...Package) {
+	t.Helper()
+	outcome := "applied"
+	if !healthy {
+		outcome = "health_failed"
+	}
+	if err := f.s.Ingest(host, Report{RunID: host + trigger + f.now.String(), Trigger: trigger, Mode: "apply", Outcome: outcome,
+		Healthy: healthy, Installed: pkgs, Upgraded: pkgs[:1]}); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// The ruled wait: approved only after every ring-0 box ran the set healthy for ApproveAfter AND through a night run.
+// Red-proof: drop the age check, the healthy check or the nights check in Evaluate and a sub-step fails.
+func TestApproval_WaitHealthyAndOneNight(t *testing.T) {
+	f := newFix(t)
+	set := []Package{pk("libc6", "2.41-12+deb13u4"), pk("openssl", "3.5.7-1~deb13u3")}
+	f.report(t, "hp", "debug", true, set...)
+	f.report(t, "n100", "debug", true, set...)
+	st, _ := f.s.Evaluate()
+	if !strings.HasPrefix(st.Waiting, "healthy for") {
+		t.Fatalf("fresh set approved or wrong reason: %+v", st)
+	}
+	f.now = f.now.Add(25 * time.Hour)
+	st, _ = f.s.Evaluate()
+	if !strings.Contains(st.Waiting, "night run") {
+		t.Fatalf("approved without a night run: %+v", st)
+	}
+	f.report(t, "hp", "night", true, set...)
+	f.report(t, "n100", "night", true, set...)
+	if _, err := f.s.Evaluate(); err != nil {
+		t.Fatal(err)
+	}
+	rel, _ := f.s.Store.LatestOSRelease()
+	if rel == nil || rel.ApprovedBy != "auto" {
+		t.Fatalf("not approved: %+v", rel)
+	}
+	if len(f.bumps) != 1 || f.bumps[0] != "cust1" {
+		t.Fatalf("only the ring-1 box must be nudged, got %v", f.bumps)
+	}
+	b := f.s.DesiredBlock("cust1")
+	if b.Ring != 1 || !b.Enabled || b.Release == nil || len(b.Release.Packages) != 2 || b.Release.Snapshot != rel.ApprovedAt.UTC().Format("20060102T150405Z") {
+		t.Fatalf("ring-1 block = %+v", b)
+	}
+	if hb := f.s.DesiredBlock("hp"); hb.Ring != 0 || hb.Release != nil {
+		t.Fatalf("a ring-0 box must not get a release (it installs everything pending): %+v", hb)
+	}
+}
+
+func TestApproval_UnhealthyRunBlocks(t *testing.T) {
+	f := newFix(t)
+	set := []Package{pk("libc6", "2.41-12+deb13u4")}
+	f.report(t, "hp", "debug", true, set...)
+	f.report(t, "n100", "debug", true, set...)
+	f.s.Evaluate()
+	f.now = f.now.Add(25 * time.Hour)
+	f.report(t, "hp", "night", false, set...)
+	f.report(t, "n100", "night", true, set...)
+	st, _ := f.s.Evaluate()
+	if rel, _ := f.s.Store.LatestOSRelease(); rel != nil {
+		t.Fatalf("approved although a ring-0 run was not healthy: %+v", st)
+	}
+	if !strings.Contains(st.Waiting, "healthy=false") {
+		t.Fatalf("reason = %q", st.Waiting)
+	}
+	found := false
+	for _, e := range f.events {
+		found = found || e == EventHealthFailed
+	}
+	if !found {
+		t.Fatalf("no %s event: %v", EventHealthFailed, f.events)
+	}
+}
+
+// Ring 0 disagreeing on a package: that package is left out of the candidate (C9 — approve what ALL ring 0 runs).
+func TestCandidate_DisagreementLeftOut(t *testing.T) {
+	f := newFix(t)
+	f.report(t, "hp", "night", true, pk("libc6", "2.41-12+deb13u4"), pk("curl", "8.14.1-2+deb13u5"))
+	f.report(t, "n100", "night", true, pk("libc6", "2.41-12+deb13u4"), pk("curl", "8.14.1-2+deb13u4"))
+	cand, _, err := f.s.candidate([]string{"hp", "n100"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, ok := cand["curl"]; ok || cand["libc6"].Version != "2.41-12+deb13u4" {
+		t.Fatalf("candidate = %+v", cand)
+	}
+}
+
+// Non-Debian origins never enter a release (the fast lane is Debian / Debian-Security only, C3).
+func TestCandidate_OnlyDebianOrigins(t *testing.T) {
+	f := newFix(t)
+	d := Package{Name: "docker-ce", Version: "5:29.8.2", Origin: "Docker"}
+	f.report(t, "hp", "night", true, pk("libc6", "x1"), d)
+	f.report(t, "n100", "night", true, pk("libc6", "x1"), d)
+	cand, _, _ := f.s.candidate([]string{"hp", "n100"})
+	if _, ok := cand["docker-ce"]; ok {
+		t.Fatal("a Docker package entered the candidate")
+	}
+}
+
+func TestApproveNow_IsAnOperatorEvent(t *testing.T) {
+	f := newFix(t)
+	f.report(t, "hp", "debug", true, pk("libc6", "x1"))
+	f.report(t, "n100", "debug", true, pk("libc6", "x1"))
+	id, err := f.s.ApproveNow()
+	if err != nil || id == "" {
+		t.Fatalf("%q %v", id, err)
+	}
+	rel, _ := f.s.Store.LatestOSRelease()
+	if rel.ApprovedBy != "operator" {
+		t.Fatalf("approved_by = %q", rel.ApprovedBy)
+	}
+	n := 0
+	for _, e := range f.events {
+		if e == EventApprovedNow {
+			n++
+		}
+	}
+	if n != 1 {
+		t.Fatalf("want one %s, got %v", EventApprovedNow, f.events)
+	}
+}
+
+func TestSwitchAndRing(t *testing.T) {
+	f := newFix(t)
+	if err := f.s.SetEnabled("cust1", false); err != nil {
+		t.Fatal(err)
+	}
+	if b := f.s.DesiredBlock("cust1"); b.Enabled {
+		t.Fatal("switch OFF not delivered")
+	}
+	if err := f.s.SetRing("cust1", 2); err == nil {
+		t.Fatal("ring 2 accepted")
+	}
+	if b := f.s.DesiredBlock("nobody-row"); b.Ring != 1 || !b.Enabled {
+		t.Fatalf("default must be ring 1, ON: %+v", b)
+	}
+}
+
+func TestIngest_AppliedIsTheHouseholdsLine(t *testing.T) {
+	f := newFix(t)
+	f.report(t, "cust1", "night", true, pk("libc6", "x1"))
+	if len(f.events) != 1 || f.events[0] != EventApplied {
+		t.Fatalf("events = %v", f.events)
+	}
+}
diff --git a/hub/internal/store/os_updates.go b/hub/internal/store/os_updates.go
new file mode 100644
index 00000000..15988a22
--- /dev/null
+++ b/hub/internal/store/os_updates.go
@@ -0,0 +1,211 @@
+package store
+
+import (
+	"database/sql"
+	"time"
+)
+
+// OS updates, guest fast lane (`11-os-updates.md` §5.3, §8 step 2; hub v0.130.0).
+//
+// Three records:
+//   - os_host_settings: the operator's per-box ring (0 = demo boxes that take every update first, 1 = every other
+//     box) and switch (ON by default — decision 12's shape). A host with no row is ring 1, ON.
+//   - os_reports: every run the agent reports (the full installed set rides in report_json — C9: what ring 0 RUNS).
+//   - os_candidates / os_releases: the version set ring 0 runs, first seen when, and the approved releases.
+
+func (s *Store) migrateOSUpdates() error {
+	_, err := s.db.Exec(`
+		CREATE TABLE IF NOT EXISTS os_host_settings (
+			host_id    TEXT PRIMARY KEY,
+			ring       INTEGER NOT NULL DEFAULT 1,
+			enabled    INTEGER NOT NULL DEFAULT 1,
+			updated_at DATETIME NOT NULL DEFAULT (datetime('now'))
+		);
+		CREATE TABLE IF NOT EXISTS os_reports (
+			id          INTEGER PRIMARY KEY AUTOINCREMENT,
+			host_id     TEXT NOT NULL,
+			received_at DATETIME NOT NULL DEFAULT (datetime('now')),
+			trigger     TEXT NOT NULL DEFAULT '',
+			mode        TEXT NOT NULL DEFAULT '',
+			outcome     TEXT NOT NULL DEFAULT '',
+			healthy     INTEGER NOT NULL DEFAULT 0,
+			release_id  TEXT NOT NULL DEFAULT '',
+			report_json TEXT NOT NULL DEFAULT '{}'
+		);
+		CREATE INDEX IF NOT EXISTS idx_os_reports_host ON os_reports(host_id, id);
+		CREATE TABLE IF NOT EXISTS os_candidates (
+			fingerprint   TEXT PRIMARY KEY,
+			first_seen    DATETIME NOT NULL,
+			packages_json TEXT NOT NULL
+		);
+		CREATE TABLE IF NOT EXISTS os_releases (
+			id            TEXT PRIMARY KEY,
+			fingerprint   TEXT NOT NULL,
+			approved_at   DATETIME NOT NULL,
+			approved_by   TEXT NOT NULL,
+			packages_json TEXT NOT NULL
+		);
+	`)
+	return err
+}
+
+// OSHostSettings is one box's ring and switch.
+type OSHostSettings struct {
+	HostID  string
+	Ring    int
+	Enabled bool
+}
+
+// GetOSHostSettings returns the box's settings; a box with no row is ring 1, ON.
+func (s *Store) GetOSHostSettings(hostID string) OSHostSettings {
+	st := OSHostSettings{HostID: hostID, Ring: 1, Enabled: true}
+	var ring, en int
+	if err := s.db.QueryRow(`SELECT ring, enabled FROM os_host_settings WHERE host_id = ?`, hostID).Scan(&ring, &en); err == nil {
+		st.Ring, st.Enabled = ring, en == 1
+	}
+	return st
+}
+
+// SetOSRing sets the box's ring (0 or 1).
+func (s *Store) SetOSRing(hostID string, ring int) error {
+	_, err := s.db.Exec(`INSERT INTO os_host_settings (host_id, ring) VALUES (?, ?)
+		ON CONFLICT(host_id) DO UPDATE SET ring = excluded.ring, updated_at = datetime('now')`, hostID, ring)
+	return err
+}
+
+// SetOSEnabled sets the box's switch.
+func (s *Store) SetOSEnabled(hostID string, on bool) error {
+	v := 0
+	if on {
+		v = 1
+	}
+	_, err := s.db.Exec(`INSERT INTO os_host_settings (host_id, enabled) VALUES (?, ?)
+		ON CONFLICT(host_id) DO UPDATE SET enabled = excluded.enabled, updated_at = datetime('now')`, hostID, v)
+	return err
+}
+
+// OSReport is one stored run.
+type OSReport struct {
+	ID         int64
+	HostID     string
+	ReceivedAt time.Time
+	Trigger    string
+	Mode       string
+	Outcome    string
+	Healthy    bool
+	ReleaseID  string
+	ReportJSON string
+}
+
+// SaveOSReport stores one run.
+func (s *Store) SaveOSReport(r OSReport) (int64, error) {
+	h := 0
+	if r.Healthy {
+		h = 1
+	}
+	at := r.ReceivedAt
+	if at.IsZero() {
+		at = time.Now()
+	}
+	// received_at comes from the CALLER's clock: the approval rule compares it with first_seen, which the
+	// service stamps with its own clock — two clocks would make "since first seen" miss reports.
+	res, err := s.db.Exec(`INSERT INTO os_reports (host_id, received_at, trigger, mode, outcome, healthy, release_id, report_json) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+		r.HostID, at.UTC().Format("2006-01-02 15:04:05"), r.Trigger, r.Mode, r.Outcome, h, r.ReleaseID, r.ReportJSON)
+	if err != nil {
+		return 0, err
+	}
+	return res.LastInsertId()
+}
+
+func scanOSReports(rows *sql.Rows) ([]OSReport, error) {
+	defer rows.Close()
+	var out []OSReport
+	for rows.Next() {
+		var r OSReport
+		var at string
+		var h int
+		if err := rows.Scan(&r.ID, &r.HostID, &at, &r.Trigger, &r.Mode, &r.Outcome, &h, &r.ReleaseID, &r.ReportJSON); err != nil {
+			return nil, err
+		}
+		r.ReceivedAt, r.Healthy = parseSQLiteTime(at), h == 1
+		out = append(out, r)
+	}
+	return out, rows.Err()
+}
+
+const osReportCols = `id, host_id, received_at, trigger, mode, outcome, healthy, release_id, report_json`
+
+// LatestOSReport returns the box's newest run, or nil.
+func (s *Store) LatestOSReport(hostID string) (*OSReport, error) {
+	rows, err := s.db.Query(`SELECT `+osReportCols+` FROM os_reports WHERE host_id = ? ORDER BY id DESC LIMIT 1`, hostID)
+	if err != nil {
+		return nil, err
+	}
+	rs, err := scanOSReports(rows)
+	if err != nil || len(rs) == 0 {
+		return nil, err
+	}
+	return &rs[0], nil
+}
+
+// OSReportsSince returns the box's runs received at or after t, oldest first.
+func (s *Store) OSReportsSince(hostID string, t time.Time) ([]OSReport, error) {
+	rows, err := s.db.Query(`SELECT `+osReportCols+` FROM os_reports WHERE host_id = ? AND received_at >= ? ORDER BY id`,
+		hostID, t.UTC().Format("2006-01-02 15:04:05"))
+	if err != nil {
+		return nil, err
+	}
+	return scanOSReports(rows)
+}
+
+// OSCandidateFirstSeen records a candidate set the first time it is seen and returns when that was.
+func (s *Store) OSCandidateFirstSeen(fingerprint, packagesJSON string, now time.Time) (time.Time, error) {
+	if _, err := s.db.Exec(`INSERT OR IGNORE INTO os_candidates (fingerprint, first_seen, packages_json) VALUES (?, ?, ?)`,
+		fingerprint, now.UTC().Format("2006-01-02 15:04:05"), packagesJSON); err != nil {
+		return time.Time{}, err
+	}
+	var at string
+	if err := s.db.QueryRow(`SELECT first_seen FROM os_candidates WHERE fingerprint = ?`, fingerprint).Scan(&at); err != nil {
+		return time.Time{}, err
+	}
+	return parseSQLiteTime(at), nil
+}
+
+// OSRelease is one approved version set.
+type OSRelease struct {
+	ID           string
+	Fingerprint  string
+	ApprovedAt   time.Time
+	ApprovedBy   string
+	PackagesJSON string
+}
+
+// SaveOSRelease stores an approved release.
+func (s *Store) SaveOSRelease(r OSRelease) error {
+	_, err := s.db.Exec(`INSERT INTO os_releases (id, fingerprint, approved_at, approved_by, packages_json) VALUES (?, ?, ?, ?, ?)`,
+		r.ID, r.Fingerprint, r.ApprovedAt.UTC().Format("2006-01-02 15:04:05"), r.ApprovedBy, r.PackagesJSON)
+	return err
+}
+
+// LatestOSRelease returns the newest approved release, or nil.
+func (s *Store) LatestOSRelease() (*OSRelease, error) {
+	var r OSRelease
+	var at string
+	err := s.db.QueryRow(`SELECT id, fingerprint, approved_at, approved_by, packages_json FROM os_releases ORDER BY approved_at DESC, id DESC LIMIT 1`).
+		Scan(&r.ID, &r.Fingerprint, &at, &r.ApprovedBy, &r.PackagesJSON)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	r.ApprovedAt = parseSQLiteTime(at)
+	return &r, nil
+}
+
+// BackdateOSCandidateForTest moves a candidate's first_seen into the past. TEST-ONLY.
+func (s *Store) BackdateOSCandidateForTest(fingerprint string, by time.Duration) error {
+	_, err := s.db.Exec(`UPDATE os_candidates SET first_seen = ? WHERE fingerprint = ?`,
+		time.Now().Add(-by).UTC().Format("2006-01-02 15:04:05"), fingerprint)
+	return err
+}
diff --git a/hub/internal/store/store.go b/hub/internal/store/store.go
index 2b7ad2cf..1693f106 100644
--- a/hub/internal/store/store.go
+++ b/hub/internal/store/store.go
@@ -858,6 +858,10 @@ func (s *Store) migrate() error {
 	}
 	// R-833 (v0.129.0): the cap each window was opened with — an operator grant may raise it once.
 	s.db.Exec("ALTER TABLE offsite_windows ADD COLUMN max_remove INTEGER")
+	// OS updates, guest fast lane (hub v0.130.0, `11` §8 step 2).
+	if err := s.migrateOSUpdates(); err != nil {
+		return fmt.Errorf("os_updates: %w", err)
+	}
 
 	return nil
 }
diff --git a/hub/internal/web/os_updates.go b/hub/internal/web/os_updates.go
new file mode 100644
index 00000000..6e9fb591
--- /dev/null
+++ b/hub/internal/web/os_updates.go
@@ -0,0 +1,52 @@
+package web
+
+import (
+	"encoding/json"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+// handleOSAdmin serves the operator's OS-update controls (behind the operator login, like every route here):
+//
+//	POST /os/ring/<host_id>     ring=0|1
+//	POST /os/enabled/<host_id>  on=1|0
+//	POST /os/approve-now        approve the current ring-0 set at once (an operator event)
+//	GET  /os/fleet              one line per box (JSON)
+func (s *Server) handleOSAdmin(w http.ResponseWriter, r *http.Request, path string) {
+	if s.osUpdates == nil {
+		http.Error(w, "os updates not configured", http.StatusServiceUnavailable)
+		return
+	}
+	reply := func(v any, err error) {
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(v)
+	}
+	switch {
+	case r.Method == http.MethodGet && path == "/os/fleet":
+		reply(s.osUpdates.FleetJSON())
+	case r.Method == http.MethodPost && strings.HasPrefix(path, "/os/ring/"):
+		n, err := strconv.Atoi(r.FormValue("ring"))
+		if err != nil {
+			http.Error(w, "ring must be 0 or 1", http.StatusBadRequest)
+			return
+		}
+		reply(map[string]bool{"ok": true}, s.osUpdates.SetRing(strings.TrimPrefix(path, "/os/ring/"), n))
+	case r.Method == http.MethodPost && strings.HasPrefix(path, "/os/enabled/"):
+		on := r.FormValue("on")
+		if on != "0" && on != "1" {
+			http.Error(w, "on must be 0 or 1", http.StatusBadRequest)
+			return
+		}
+		reply(map[string]bool{"ok": true}, s.osUpdates.SetEnabled(strings.TrimPrefix(path, "/os/enabled/"), on == "1"))
+	case r.Method == http.MethodPost && path == "/os/approve-now":
+		id, err := s.osUpdates.ApproveNow()
+		reply(map[string]string{"release_id": id}, err)
+	default:
+		http.Error(w, "not found", http.StatusNotFound)
+	}
+}
diff --git a/hub/internal/web/server.go b/hub/internal/web/server.go
index 114bbf10..99fe41e2 100644
--- a/hub/internal/web/server.go
+++ b/hub/internal/web/server.go
@@ -73,6 +73,7 @@ type Server struct {
 	// offsiteWindowAdmin: operator one-shot grant / weekly switch (decision 68). nil → 503.
 	offsiteWindowGrant  func(customerID string) error
 	offsiteWindowGrantMax func(customerID string, maxRemove int) error
+	osUpdates             OSUpdateAdmin
 	offsiteWindowSwitch func(on bool) error
 	// operator key-file clean-up (decision 72) and abandonment cancel (decision 74). nil → 503.
 	offsiteRemoveUnpinned func(ctx context.Context, customerID string) (int, error)
@@ -212,6 +213,17 @@ func (s *Server) SetOffsiteKeyAdmin(remove func(context.Context, string) (int, e
 	s.offsiteRemoveUnpinned, s.offsiteAbandonCancel = remove, cancel
 }
 
+// OSUpdateAdmin is the operator side of the guest fast lane (hub v0.130.0).
+type OSUpdateAdmin interface {
+	SetRing(hostID string, ring int) error
+	SetEnabled(hostID string, on bool) error
+	ApproveNow() (string, error)
+	FleetJSON() (any, error)
+}
+
+// SetOSUpdateAdmin wires the OS-update operator routes.
+func (s *Server) SetOSUpdateAdmin(a OSUpdateAdmin) { s.osUpdates = a }
+
 // SetOffsiteWindowLargeGrant wires the operator's one-window raised cap (R-833).
 func (s *Server) SetOffsiteWindowLargeGrant(fn func(string, int) error) { s.offsiteWindowGrantMax = fn }
 
@@ -681,6 +693,9 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 		w.Header().Set("Content-Type", "application/json")
 		_, _ = w.Write([]byte("{\"ok\":true}\n"))
+	case strings.HasPrefix(path, "/os/"):
+		// Operator (hub v0.130.0, `11` §8 step 2): per-box ring and switch, approve now, the fleet lines.
+		s.handleOSAdmin(w, r, path)
 	case path == "/offsite/key-audit":
 		// Operator: run the daily off-site key check now (decision 69). Same code path as the 07:10 job.
 		if r.Method != http.MethodPost {