Apply code-review fixes: identity/pagination, load races, TLS pin, leaks

Addresses a multi-agent code review (26 confirmed findings + a URLSession
leak) across correctness, concurrency, security, and cleanup:

- MongoDocument.id: deterministic fallback (was UUID() on every access) to stop
  SwiftUI List/ForEach identity churn; getAll pagination drives its cursor off
  the real _id via documentId, so a missing _id stops paging instead of looping
  on a fabricated cursor.
- View models: per-load generation guard (+ captured-tab guard on ONU detail)
  so a cancelled or overlapping load can't commit stale results or land data on
  the wrong tab.
- JSONValue.intValue: guard Int(d) against NaN/inf/out-of-range (crash).
- ServerTrustEvaluator: hash the real SubjectPublicKeyInfo (prepend the
  algorithm-specific ASN.1 SPKI header) so a standard openssl-captured
  public-key pin actually matches; unknown key types fail closed.
- AppEnvironment.configure: clear stale cookies + Keychain creds on host change.
- FirmwareFile.isCompatible: empty metadata no longer passes as compatible-for-all.
- APIClient: invalidate URLSession on deinit (per-configure/probe leak).
- Dashboard best-effort sections keep last-good on transient failure; unified
  optical thresholds; LoginView prefill-once; populatedBuckets unique ForEach id;
  Format rounding rollover; dead-code/docstring/dedup cleanups.

Verification pending on the Mac (no Swift toolchain on the Linux dev box).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

APIClient.swift

@@ -47,6 +47,12 @@ final class APIClient {
         self.session = URLSession(configuration: cfg, delegate: trustDelegate, delegateQueue: nil)
     }
 
+    /// A `URLSession` created with a delegate retains that delegate (and itself)
+    /// until invalidated — Apple: an un-invalidated session "leaks memory until
+    /// it exits." This client is rebuilt on every `configure`/`probe`, so tear the
+    /// session down when the client goes away.
+    deinit { session.invalidateAndCancel() }
+
     // MARK: - Public API
 
     /// GET returning a decoded `T` from the envelope's `data`.
@@ -128,6 +134,11 @@ final class APIClient {
     /// is returned. `pageLimit` defaults to 100: full Mongo docs are ~30 KB, so
     /// larger pages (the server default is 1000) can exceed the front-end proxy
     /// timeout on big fleets. See MCMS field guide §3.3–3.4.
+    ///
+    /// `idOf` MUST return the document's real `_id` (the cursor MCMS excludes
+    /// at/before), or nil. Pass `{ $0.documentId }`, never the synthesized
+    /// `Identifiable.id` — a fabricated id is a meaningless cursor that makes the
+    /// server re-serve or skip pages. A nil id safely stops pagination.
     func getAll<T: Decodable>(
         _ endpoint: MCMSEndpoint,
         baseQuery: APIQuery = .empty,
@@ -143,7 +154,8 @@ final class APIClient {
             q.next = cursor
             let page: [T] = try await get(endpoint, query: q, as: [T].self, version: version)
             all.append(contentsOf: page)
-            cursor = page.count == pageLimit ? page.last.flatMap(idOf) : nil
+            // Stop on a short/empty page, or when the last doc has no usable `_id`.
+            cursor = (page.count == pageLimit) ? page.last.flatMap(idOf) : nil
         } while cursor != nil
         return all
     }

APIEnvelope.swift

@@ -78,7 +78,14 @@ indirect enum JSONValue: Codable, Equatable {
     }
     var stringValue: String? { if case .string(let s) = self { return s }; return nil }
     var intValue: Int? {
-        switch self { case .int(let i): return i; case .double(let d): return Int(d); default: return nil }
+        switch self {
+        case .int(let i): return i
+        // `Int(_:)` traps on NaN/±inf/out-of-range; JSONDecoder can yield those
+        // from extreme literals (e.g. `1e400` → .infinity). Guard so a malformed
+        // server number becomes nil instead of a crash.
+        case .double(let d): return (d.isFinite && d >= Double(Int.min) && d < Double(Int.max)) ? Int(d) : nil
+        default: return nil
+        }
     }
     var doubleValue: Double? {
         switch self { case .double(let d): return d; case .int(let i): return Double(i); default: return nil }

APIQuery.swift

@@ -32,6 +32,11 @@ struct APIQuery {
         return f
     }()
 
+    /// NOTE: `query`/`projection`/`sort` are flattened with literal `=`/`,`
+    /// separators that MCMS uses to split pairs. Keys/values are NOT escaped, so a
+    /// key or value that itself contains `=` or `,` will be mis-parsed into the
+    /// wrong filter. Current callers only use simple equality on safe field names;
+    /// keep it that way (or escape per the MCMS parser's rules) — see field guide §3.8.
     func queryItems() -> [URLQueryItem] {
         var items: [URLQueryItem] = []
 

AppEnvironment.swift

@@ -23,6 +23,13 @@ final class AppEnvironment {
     // MARK: Configuration
 
     func configure(_ config: APIConfiguration) {
+        // Pointing at a different server: drop the old host's session cookies and
+        // saved credentials. Keychain accounts aren't host-scoped, so leaving them
+        // would offer server A's login (and replay A's stale `sessionid`) on B.
+        if configuration?.host != config.host {
+            connection?.session.clear()
+            forgetCredentials()
+        }
         configuration = config
         connection = makeConnection(config)
         isAuthenticated = false
@@ -86,8 +93,10 @@ final class AppEnvironment {
         isAuthenticated = false
     }
 
-    /// Reachability / trust probe used by the Settings screen. Builds a
+    /// Reachability / trust probe used by the Settings screen. Builds a throwaway
-    /// throwaway connection so testing does NOT disturb the active session.
+    /// connection and issues only an unauthenticated `version()` GET. (It shares
+    /// `HTTPCookieStorage.shared` with the live session, but performs no login, so
+    /// it does not alter authenticated session state.)
     /// A 401/403/404 still means the host answered over a trusted TLS channel —
     /// that's a successful reachability result; only transport/trust errors fail.
     func probe(_ config: APIConfiguration) async throws -> String {

AuthModels.swift

@@ -16,8 +16,6 @@ struct AuthResponse: Decodable, EmptyRepresentable {
     private init(raw: JSONValue) { self.raw = raw }
 
     static var emptyValue: AuthResponse { AuthResponse(raw: .null) }
-
-    var email: String? { raw["email"]?.stringValue ?? raw["User"]?["email"]?.stringValue }
 }
 
 /// `GET /v{n}/ponmgr/version/` — attribute set describing the install.

DashboardDrilldownViews.swift

@@ -23,7 +23,7 @@ struct AbnormalRxListView: View {
                         VStack(alignment: .trailing, spacing: 2) {
                             Text("\(rx.formatted(.number.precision(.fractionLength(1)))) dBm")
                                 .font(.callout.monospacedDigit()).foregroundStyle(.orange)
-                            Text(rx < -28 ? "weak" : "strong")
+                            Text(rx < OpticalThreshold.rxGreenFloor ? "weak" : "strong")
                                 .font(.caption2).foregroundStyle(.secondary)
                         }
                     }

DashboardViewModel.swift

@@ -24,55 +24,65 @@ final class DashboardViewModel {
     var lasersOffOLTs: [OLTStateDoc] = []
 
     private let connection: MCMSConnection
+    /// Bumped per load; only the latest load commits, so the 30s auto-refresh loop
+    /// and a manual pull-to-refresh can't interleave partial writes.
+    private var loadGeneration = 0
     init(connection: MCMSConnection) { self.connection = connection }
 
     /// Light by default: the ONU count, state breakdown, OLT traffic and
     /// laser-off count all come from the (small) OLT-STATE docs. The heavy
     /// per-ONU optical scan runs only when `extraStats` is on.
     func load(extraStats: Bool = false) async {
+        loadGeneration += 1
+        let gen = loadGeneration
         phase = .loading
         do {
             // OLT-STATE drives the OLT count, ONU registration (dev guide
             // Procedure 2), total traffic, and laser state — all from a handful
-            // of small docs.
+            // of small docs. Fetch everything into locals first, then commit once,
+            // so an overlapping load can't publish a half-updated dashboard.
             let olts = try await connection.olt.allStates()
-            oltCount = olts.count
-
             let registration = OLTRepository.registrationMap(from: olts)
+
+            // Best-effort sections: nil means "fetch failed this cycle" → keep the
+            // last good value rather than flicker to empty/zero on a transient blip.
+            let controllers = try? await connection.controller.allConfigs().count
+            let alarms = try? await connection.onu.alarmHistories()
+
+            // Opt-in heavy scan: pull every ONU-STATE for the Rx optical check.
+            var optAvailable = false
+            var abnormal: [ONUStateDoc] = []
+            if extraStats {
+                let onus = try await connection.onu.allStates()
+                optAvailable = onus.contains { $0.rxOpticalDBm != nil }
+                abnormal = onus.filter { $0.rxOpticalDBm.map(OpticalThreshold.rxAbnormal) ?? false }
+            }
+
+            guard gen == loadGeneration, !Task.isCancelled else { return }
+
+            oltCount = olts.count
             onuTotal = registration.count
             onuCounts = Dictionary(grouping: registration.values, by: { $0 })
                 .map { (state: $0.key, count: $0.value.count) }
                 .sorted { $0.count > $1.count }
-
             totalDownstreamBps = olts.compactMap(\.txRateBps).reduce(0, +)
             totalUpstreamBps = olts.compactMap(\.rxRateBps).reduce(0, +)
             lasersOffOLTs = olts.filter(\.isLaserOff)
             lasersOffCount = lasersOffOLTs.count
 
-            controllerCount = (try? await connection.controller.allConfigs().count) ?? 0
+            if let controllers { controllerCount = controllers }      // else keep last good
-
+            if let alarms {
-            if let alarms = try? await connection.onu.alarmHistories() {
                 severityCounts = Dictionary(grouping: alarms, by: { $0.severity })
                     .map { (severity: $0.key, count: $0.value.count) }
                     .sorted { $0.severity.rank < $1.severity.rank }
-            }
+            }                                                          // else keep last good
 
-            // Opt-in heavy scan: pull every ONU-STATE for the Rx optical check.
+            opticalAvailable = optAvailable
-            if extraStats {
+            abnormalRxONUs = abnormal
-                let onus = try await connection.onu.allStates()
+            abnormalRxCount = abnormal.count
-                opticalAvailable = onus.contains { $0.rxOpticalDBm != nil }
-                abnormalRxONUs = onus.filter { onu in
-                    guard let rx = onu.rxOpticalDBm else { return false }
-                    return rx < -28 || rx > -10
-                }
-                abnormalRxCount = abnormalRxONUs.count
-            } else {
-                opticalAvailable = false
-                abnormalRxONUs = []
-                abnormalRxCount = 0
-            }
             phase = .loaded
         } catch {
+            guard gen == loadGeneration, !Task.isCancelled else { return }
             phase = .failed((error as? APIError)?.localizedDescription ?? error.localizedDescription)
         }
     }

DeviceModels.swift

@@ -80,6 +80,12 @@ enum AlarmSeverity: String, Decodable, CaseIterable, Comparable {
     }
 
     static func < (lhs: AlarmSeverity, rhs: AlarmSeverity) -> Bool { lhs.rank < rhs.rank }
+
+    /// Read a severity from a Mongo doc that may key it as `Severity` or `severity`.
+    static func from(_ raw: JSONValue) -> AlarmSeverity {
+        guard let s = raw["Severity"]?.stringValue ?? raw["severity"]?.stringValue else { return .unknown }
+        return AlarmSeverity(rawValue: s.lowercased()) ?? .unknown
+    }
 }
 
 // MARK: - Flexible documents
@@ -96,15 +102,41 @@ protocol MongoDocument: Decodable, Identifiable {
 }
 
 extension MongoDocument {
+    /// The document's real Mongo `_id`, or nil when absent. Use THIS for the
+    /// pagination cursor (`getAll`) — never the `id` fallback below.
     var documentId: String? { raw["_id"]?.stringValue }
 }
 
+// NOTE on `id`: each document's `id` falls back to `raw.compactDescription` when
+// `_id` is missing — a deterministic value derived from the content, NOT a fresh
+// `UUID()`. `id` is a *computed* property, so a random UUID would change on every
+// access and hand SwiftUI a new identity each render, tearing down and rebuilding
+// List/ForEach rows (lost scroll position, broken animations). The content-derived
+// key is stable for the same instance, so identity holds across re-renders.
+
+/// nil when the string is nil or empty, else the string. Shared by the document
+/// accessors that should treat "" as "absent".
+private func nonEmpty(_ s: String?) -> String? { (s?.isEmpty == false) ? s : nil }
+
+/// Single source of truth for ONU optical thresholds (dBm, user guide §7). Shared
+/// by the dashboard abnormal-Rx filter and the detail-view tinting so the two
+/// screens can't give the operator contradicting verdicts for the same reading.
+enum OpticalThreshold {
+    static let rxGreenFloor = -28.0   // at/above (and ≤ rxHigh) is in-spec / green
+    static let rxRedFloor = -30.0     // below this is critical / red
+    static let rxHigh = -10.0         // above this is abnormal (too hot)
+    static let txGreenFloor = 3.0
+
+    /// Whether an RX reading (dBm) is abnormal: too weak or too hot.
+    static func rxAbnormal(_ dBm: Double) -> Bool { dBm < rxGreenFloor || dBm > rxHigh }
+}
+
 /// ONU state document (`ONU-STATE`).
 struct ONUStateDoc: MongoDocument {
     let raw: JSONValue
     init(from decoder: Decoder) throws { raw = try JSONValue(from: decoder) }
 
-    var id: String { raw["_id"]?.stringValue ?? UUID().uuidString }
+    var id: String { raw["_id"]?.stringValue ?? raw.compactDescription }
 
     var serialNumber: String? { raw["_id"]?.stringValue }
     /// Parent OLT MAC, from `OLT.MAC Address` (dev guide Procedure 2 §2).
@@ -143,7 +175,7 @@ struct ONUStateDoc: MongoDocument {
 struct ONUConfigDoc: MongoDocument {
     let raw: JSONValue
     init(from decoder: Decoder) throws { raw = try JSONValue(from: decoder) }
-    var id: String { raw["_id"]?.stringValue ?? UUID().uuidString }
+    var id: String { raw["_id"]?.stringValue ?? raw.compactDescription }
     /// Operator-set label (`ONU.Name`, §5.1).
     var name: String? { raw["ONU"]?["Name"]?.stringValue }
     var netconfName: String? { raw["Netconf"]?["Name"]?.stringValue }
@@ -153,7 +185,7 @@ struct ONUConfigDoc: MongoDocument {
 struct OLTConfigDoc: MongoDocument {
     let raw: JSONValue
     init(from decoder: Decoder) throws { raw = try JSONValue(from: decoder) }
-    var id: String { raw["_id"]?.stringValue ?? UUID().uuidString }   // MAC address
+    var id: String { raw["_id"]?.stringValue ?? raw.compactDescription }   // MAC address
     /// Operator label from `OLT.Name` (confirmed against a live OLT-CFG, e.g.
     /// "OLT69-RIN"). Note `NETCONF.Name` defaults to the MAC, so it's *not* the
     /// friendly name. Returns nil when unset.
@@ -168,11 +200,12 @@ struct OLTConfigDoc: MongoDocument {
 struct OLTStateDoc: MongoDocument {
     let raw: JSONValue
     init(from decoder: Decoder) throws { raw = try JSONValue(from: decoder) }
-    var id: String { raw["_id"]?.stringValue ?? UUID().uuidString }   // OLT MAC address
+    var id: String { raw["_id"]?.stringValue ?? raw.compactDescription }   // OLT MAC address
     var lastUpdate: String? { raw["Time"]?.stringValue }
 
-    /// Operator name from OLT-CFG (`Netconf.Name`); resolved + stamped by the
+    /// Operator name from OLT-CFG (`OLT.Name` — NOT `Netconf.Name`, which defaults
-    /// list VM via `OLTRepository.nameMap()`. `nil` until resolved / if unset.
+    /// to the MAC); resolved + stamped by the list VM via `OLTRepository.nameMap()`.
+    /// `nil` until resolved / if unset.
     var resolvedName: String?
     /// Best label to show: the operator name if set, else the MAC id.
     var displayName: String {
@@ -194,14 +227,18 @@ struct OLTStateDoc: MongoDocument {
         }
     }
 
-    /// Non-empty registration buckets, ordered by lifecycle severity.
+    /// Non-empty registration buckets, ordered by lifecycle severity. Carries the
-    var populatedBuckets: [(state: ONULifecycleState, ids: [String])] {
+    /// raw bucket `name` so callers key `ForEach` on it — keying on `state` would
+    /// collide when two unrecognized bucket names both map to `.unknown`.
+    var populatedBuckets: [(name: String, state: ONULifecycleState, ids: [String])] {
         onuStatesByBucket
             .filter { !$0.value.isEmpty }
-            .map { (state: ONULifecycleState(rawValue: $0.key) ?? .unknown, ids: $0.value.sorted()) }
+            .map { (name: $0.key, state: ONULifecycleState(rawValue: $0.key) ?? .unknown, ids: $0.value.sorted()) }
             .sorted {
                 let order = ONULifecycleState.allCases
-                return (order.firstIndex(of: $0.state) ?? .max) < (order.firstIndex(of: $1.state) ?? .max)
+                let a = order.firstIndex(of: $0.state) ?? .max
+                let b = order.firstIndex(of: $1.state) ?? .max
+                return (a, $0.name) < (b, $1.name)   // name tiebreak → stable order for unknowns
             }
     }
 }
@@ -210,7 +247,7 @@ struct OLTStateDoc: MongoDocument {
 struct ControllerConfigDoc: MongoDocument {
     let raw: JSONValue
     init(from decoder: Decoder) throws { raw = try JSONValue(from: decoder) }
-    var id: String { raw["_id"]?.stringValue ?? UUID().uuidString }   // MAC address
+    var id: String { raw["_id"]?.stringValue ?? raw.compactDescription }   // MAC address
     var version: String? { raw["CNTL"]?["Version"]?.stringValue }
 }
 
@@ -218,14 +255,10 @@ struct ControllerConfigDoc: MongoDocument {
 struct AlarmHistoryDoc: MongoDocument {
     let raw: JSONValue
     init(from decoder: Decoder) throws { raw = try JSONValue(from: decoder) }
-    var id: String { raw["_id"]?.stringValue ?? UUID().uuidString }
+    var id: String { raw["_id"]?.stringValue ?? raw.compactDescription }
 
     // TODO: confirm key paths.
-    var severity: AlarmSeverity {
+    var severity: AlarmSeverity { AlarmSeverity.from(raw) }
-        guard let s = raw["Severity"]?.stringValue ?? raw["severity"]?.stringValue
-        else { return .unknown }
-        return AlarmSeverity(rawValue: s.lowercased()) ?? .unknown
-    }
     var message: String? { raw["Message"]?.stringValue ?? raw["message"]?.stringValue }
     var raisedAt: String? { raw["Time"]?.stringValue ?? raw["timestamp"]?.stringValue }
 }
@@ -234,7 +267,7 @@ struct AlarmHistoryDoc: MongoDocument {
 struct StatSample: MongoDocument {
     let raw: JSONValue
     init(from decoder: Decoder) throws { raw = try JSONValue(from: decoder) }
-    var id: String { raw["_id"]?.stringValue ?? UUID().uuidString }
+    var id: String { raw["_id"]?.stringValue ?? raw.compactDescription }
     var timestamp: String? { raw["Time"]?.stringValue ?? raw["timestamp"]?.stringValue }
 
     /// Pull a numeric counter by key for charting.
@@ -251,12 +284,8 @@ struct StatSample: MongoDocument {
 struct LogEntry: MongoDocument {
     let raw: JSONValue
     init(from decoder: Decoder) throws { raw = try JSONValue(from: decoder) }
-    var id: String { raw["_id"]?.stringValue ?? UUID().uuidString }
+    var id: String { raw["_id"]?.stringValue ?? raw.compactDescription }
-    var severity: AlarmSeverity {
+    var severity: AlarmSeverity { AlarmSeverity.from(raw) }
-        guard let s = raw["Severity"]?.stringValue ?? raw["severity"]?.stringValue
-        else { return .unknown }
-        return AlarmSeverity(rawValue: s.lowercased()) ?? .unknown
-    }
     var message: String? { raw["Message"]?.stringValue ?? raw["message"]?.stringValue }
     var time: String? { raw["Time"]?.stringValue ?? raw["timestamp"]?.stringValue }
 }
@@ -266,7 +295,7 @@ struct CPEState: MongoDocument {
     let raw: JSONValue
     init(from decoder: Decoder) throws { raw = try JSONValue(from: decoder) }
     init(raw: JSONValue) { self.raw = raw }
-    var id: String { raw["_id"]?.stringValue ?? UUID().uuidString }
+    var id: String { raw["_id"]?.stringValue ?? raw.compactDescription }
     var mac: String? { raw["_id"]?.stringValue }
 
     // IPv4 (DHCP)
@@ -290,8 +319,6 @@ struct CPEState: MongoDocument {
     }
 
     var hasLease: Bool { ipv4 != nil || ipv6 != nil }
-
-    private func nonEmpty(_ value: String?) -> String? { (value?.isEmpty == false) ? value : nil }
 }
 
 // MARK: - ONU-STATE detail accessors (status / firmware / UNI / traffic)
@@ -391,8 +418,6 @@ extension OLTStateDoc {
     var switchName: String? { nonEmpty(raw["Switch"]?["System Name"]?.stringValue) }
     var switchPort: String? { nonEmpty(raw["Switch"]?["Port ID"]?.stringValue) }
     var switchAddress: String? { nonEmpty(raw["Switch"]?["IPv4 Address"]?.stringValue) }
-
-    private func nonEmpty(_ s: String?) -> String? { (s?.isEmpty == false) ? s : nil }
 }
 
 // MARK: - OLT action payloads

DeviceRepositories.swift

@@ -11,7 +11,7 @@ final class OLTRepository {
     }
 
     func allConfigs() async throws -> [OLTConfigDoc] {
-        try await client.getAll(.oltConfigs, idOf: { $0.id })
+        try await client.getAll(.oltConfigs, idOf: { $0.documentId })
     }
 
     /// Map of OLT id → operator name (`OLT.Name`), via projection. Skips names
@@ -19,7 +19,7 @@ final class OLTRepository {
     func nameMap() async throws -> [String: String] {
         var query = APIQuery()
         query.projection = ["OLT.Name": 1]
-        let configs: [OLTConfigDoc] = try await client.getAll(.oltConfigs, baseQuery: query, idOf: { $0.id })
+        let configs: [OLTConfigDoc] = try await client.getAll(.oltConfigs, baseQuery: query, idOf: { $0.documentId })
         return configs.reduce(into: [:]) { map, config in
             if let name = config.name, !name.isEmpty, name != config.id { map[config.id] = name }
         }
@@ -36,7 +36,7 @@ final class OLTRepository {
     }
 
     func allStates() async throws -> [OLTStateDoc] {
-        try await client.getAll(.oltStates, idOf: { $0.id })
+        try await client.getAll(.oltStates, idOf: { $0.documentId })
     }
 
     func state(id: String) async throws -> OLTStateDoc {
@@ -88,6 +88,10 @@ final class OLTRepository {
         let _: JSONValue = try await client.action("PUT", .oltReset(id: id), as: JSONValue.self)
     }
 
+    // NOTE: the four methods below (disable-onu / broadcast-enable + their pending
+    // reads) are not yet wired to any screen. Their request shapes are documented
+    // but UNEXERCISED — verify against a live box before building UI on them.
+
     /// `PUT /olts/<olt>/disable-onu/<onu>/` with body `{ "disable": Bool }` (unwrapped).
     func setONUDisabled(olt: String, onu: String, disabled: Bool) async throws {
         let _: JSONValue = try await client.send(
@@ -127,7 +131,7 @@ final class ControllerRepository {
     }
 
     func allConfigs() async throws -> [ControllerConfigDoc] {
-        try await client.getAll(.controllerConfigs, idOf: { $0.id })
+        try await client.getAll(.controllerConfigs, idOf: { $0.documentId })
     }
 
     func config(id: String) async throws -> ControllerConfigDoc {

Firmware.swift

@@ -6,7 +6,7 @@ struct FirmwareFile: MongoDocument {
     init(from decoder: Decoder) throws { raw = try JSONValue(from: decoder) }
     init(raw: JSONValue) { self.raw = raw }
 
-    var id: String { raw["_id"]?.stringValue ?? filename ?? UUID().uuidString }
+    var id: String { raw["_id"]?.stringValue ?? filename ?? raw.compactDescription }
     var filename: String? { raw["filename"]?.stringValue ?? raw["_id"]?.stringValue }
     var version: String? { raw["metadata"]?["Version"]?.stringValue }
     var manufacturer: String? { raw["metadata"]?["Compatible Manufacturer"]?.stringValue }
@@ -14,14 +14,19 @@ struct FirmwareFile: MongoDocument {
     var sizeBytes: Double? { raw["length"]?.doubleValue }
     var uploadDate: String? { raw["uploadDate"]?.stringValue }
 
-    /// True when this image targets the given ONU: manufacturer matches the ONU
+    /// True only when this image POSITIVELY targets the given ONU: manufacturer
-    /// vendor AND the ONU's equipment id is one of the compatible models (exact,
+    /// matches the ONU vendor (when both are known) AND the ONU's equipment id is
-    /// case-insensitive — substring matching would wrongly pass e.g. an
+    /// one of the compatible models (exact, case-insensitive — substring matching
-    /// "XGS2110" image for an "FTXGS2110B" ONU).
+    /// would wrongly pass e.g. an "XGS2110" image for an "FTXGS2110B" ONU).
+    ///
+    /// An image with NO declared compatibility metadata (empty manufacturer/models),
+    /// or when the ONU's equipment id is unknown, is treated as NOT compatible — for
+    /// a destructive flash, an un-typed image must be chosen deliberately via the
+    /// sheet's "Show all" escape hatch rather than appearing as compatible-for-all.
     func isCompatible(vendor: String?, equipmentId: String?) -> Bool {
         if let vendor, let manufacturer, !manufacturer.isEmpty,
            manufacturer.caseInsensitiveCompare(vendor) != .orderedSame { return false }
-        guard let equipmentId, !models.isEmpty else { return true }
+        guard let equipmentId, !models.isEmpty else { return false }
         return models.contains { $0.caseInsensitiveCompare(equipmentId) == .orderedSame }
     }
 }

Format.swift

@@ -5,21 +5,29 @@ enum Format {
     /// Bit-rate, e.g. 224229 → "224 kbps", 7216819 → "7.2 Mbps".
     static func bps(_ value: Double?) -> String {
         guard let value, value >= 0 else { return "—" }
-        let units = ["bps", "kbps", "Mbps", "Gbps", "Tbps"]
+        return scaled(value, divisor: 1000, units: ["bps", "kbps", "Mbps", "Gbps", "Tbps"])
-        var x = value, i = 0
-        while x >= 1000 && i < units.count - 1 { x /= 1000; i += 1 }
-        let digits = (i == 0 || x >= 100) ? "%.0f" : "%.1f"
-        return "\(String(format: digits, x)) \(units[i])"
     }
 
     /// Byte count, e.g. 7401438 → "7.1 MB".
     static func bytes(_ value: Double?) -> String {
         guard let value, value >= 0 else { return "—" }
-        let units = ["B", "KB", "MB", "GB", "TB", "PB"]
+        return scaled(value, divisor: 1024, units: ["B", "KB", "MB", "GB", "TB", "PB"])
+    }
+
+    private static func scaled(_ value: Double, divisor: Double, units: [String]) -> String {
         var x = value, i = 0
-        while x >= 1024 && i < units.count - 1 { x /= 1024; i += 1 }
+        while x >= divisor && i < units.count - 1 { x /= divisor; i += 1 }
-        let digits = (i == 0 || x >= 100) ? "%.0f" : "%.1f"
+        // Round at display precision FIRST, then carry to the next unit if rounding
-        return "\(String(format: digits, x)) \(units[i])"
+        // reached the ceiling (999.95 kbps → "1000" should read "1.0 Mbps").
+        var digits = (i == 0 || x >= 100) ? 0 : 1
+        var rounded = (x * pow(10, Double(digits))).rounded() / pow(10, Double(digits))
+        if rounded >= divisor && i < units.count - 1 {
+            i += 1
+            rounded /= divisor
+            digits = rounded >= 100 ? 0 : 1
+            rounded = (rounded * pow(10, Double(digits))).rounded() / pow(10, Double(digits))
+        }
+        return "\(String(format: "%.\(digits)f", rounded)) \(units[i])"
     }
 
     /// Integer percent, e.g. 13 → "13%".

LoginView.swift

@@ -7,6 +7,7 @@ struct LoginView: View {
     @State private var password = ""
     @State private var remember = true
     @State private var phase: LoadPhase = .idle
+    @State private var didPrefill = false
 
     var body: some View {
         NavigationStack {
@@ -56,6 +57,11 @@ struct LoginView: View {
                 }
             }
             .onAppear {
+                // Prefill from the Keychain ONCE — onAppear fires again when the
+                // user returns from Settings, and re-running this would wipe any
+                // credentials they'd already typed.
+                guard !didPrefill else { return }
+                didPrefill = true
                 email = env.savedEmail ?? ""
                 password = env.savedPassword ?? ""
             }

MCMSEndpoint.swift

@@ -5,6 +5,10 @@ import Foundation
 ///
 /// Reconcile exact paths with `openapi.json`; these mirror the MCMS 6.0
 /// REST API Developer Guide.
+// Some cases below are not yet wired to any repository/UI — they are documented
+// path scaffolding for upcoming features, NOT validated against a live box:
+// `databaseStatus`, `controllerStates`, `onuAlarmConfigs`/`onuAlarmConfig`,
+// `onuAutomationConfigs`/`onuAutomationConfig`. Confirm them before building on them.
 enum MCMSEndpoint {
     // Auth / session / system
     case authenticate

OLTDetailView.swift

@@ -105,7 +105,7 @@ struct OLTDetailView: View {
                 if olt.populatedBuckets.isEmpty {
                     Section { Text("No ONUs registered on this OLT.").foregroundStyle(.secondary) }
                 } else {
-                    ForEach(olt.populatedBuckets, id: \.state) { bucket in
+                    ForEach(olt.populatedBuckets, id: \.name) { bucket in
                         Section {
                             ForEach(bucket.ids, id: \.self) { onuId in
                                 NavigationLink {

OLTDetailViewModel.swift

@@ -13,17 +13,27 @@ final class OLTDetailViewModel {
     var isPerformingAction = false
     var actionMessage: String?
 
+    /// Bumped on every load; a load only commits if it's still the latest, so a
+    /// stale/overlapping request (pull-to-refresh racing the .task) can't clobber
+    /// newer results.
+    private var loadGeneration = 0
+
     init(connection: MCMSConnection, oltId: String) {
         self.connection = connection
         self.oltId = oltId
     }
 
     func load() async {
+        loadGeneration += 1
+        let gen = loadGeneration
         phase = .loading
         do {
-            olt = try await connection.olt.state(id: oltId)
+            let fetched = try await connection.olt.state(id: oltId)
+            guard gen == loadGeneration, !Task.isCancelled else { return }
+            olt = fetched
             phase = .loaded
         } catch {
+            guard gen == loadGeneration, !Task.isCancelled else { return }
             phase = .failed((error as? APIError)?.localizedDescription ?? error.localizedDescription)
         }
     }

OLTListViewModel.swift

@@ -9,6 +9,8 @@ final class OLTListViewModel {
     var search = ""
 
     private let connection: MCMSConnection
+    /// Bumped per load so an overlapping/stale fetch can't commit over a newer one.
+    private var loadGeneration = 0
     init(connection: MCMSConnection) { self.connection = connection }
 
     var filtered: [OLTStateDoc] {
@@ -21,15 +23,20 @@ final class OLTListViewModel {
     }
 
     func load() async {
+        loadGeneration += 1
+        let gen = loadGeneration
         phase = .loading
         do {
             let fetched = try await connection.olt.allStates()
             let names = (try? await connection.olt.nameMap()) ?? [:]
-            olts = fetched
+            let merged = fetched
                 .map { olt in var olt = olt; olt.resolvedName = names[olt.id]; return olt }
                 .sorted { $0.displayName.localizedCaseInsensitiveCompare($1.displayName) == .orderedAscending }
+            guard gen == loadGeneration, !Task.isCancelled else { return }
+            olts = merged
             phase = .loaded
         } catch {
+            guard gen == loadGeneration, !Task.isCancelled else { return }
             phase = .failed((error as? APIError)?.localizedDescription ?? error.localizedDescription)
         }
     }

ONUDetailView.swift

@@ -129,12 +129,14 @@ struct ONUDetailView: View {
 
     @ViewBuilder private func opticalSection(_ s: ONUStateDoc) -> some View {
         Section {
-            opticalRow("RX optical", s.rxOpticalDBm, green: -28, warn: -30)
+            opticalRow("RX optical", s.rxOpticalDBm,
-            opticalRow("TX optical", s.txOpticalDBm, green: 3, warn: 3)
+                       green: OpticalThreshold.rxGreenFloor, warn: OpticalThreshold.rxRedFloor)
+            opticalRow("TX optical", s.txOpticalDBm,
+                       green: OpticalThreshold.txGreenFloor, warn: OpticalThreshold.txGreenFloor)
         } header: {
             Text("Live optical")
         } footer: {
-            Text("Green RX ≥ −30 dBm, TX ≥ 3 dBm (user guide §7).")
+            Text("Green RX ≥ −28 dBm, TX ≥ 3 dBm (user guide §7).")
         }
         Section("FEC error counters") {
             fecRow("ONU pre-FEC",  s.onuPreFEC,  isPost: false)

ONUDetailViewModel.swift

@@ -15,6 +15,9 @@ enum ONUDetailTab: String, CaseIterable, Identifiable {
 final class ONUDetailViewModel {
     let onuId: String
     private let connection: MCMSConnection
+    /// Bumped per (re)load so a late/cancelled request — or one for a tab the user
+    /// has since left — can't commit its results over the current tab's data.
+    private var loadGeneration = 0
 
     var tab: ONUDetailTab = .stats
     var phase: LoadPhase = .idle
@@ -51,27 +54,52 @@ final class ONUDetailViewModel {
     }
 
     private func reloadCurrentTab() async {
+        loadGeneration += 1
+        let gen = loadGeneration
+        let requested = tab
+        // Commit only if this is still the latest load AND the user is still on the
+        // tab we fetched for — otherwise drop the result.
+        func current() -> Bool { gen == loadGeneration && requested == tab && !Task.isCancelled }
         do {
-            switch tab {
+            switch requested {
             case .stats:
                 // Live ONU-STATE carries the current optical/FEC levels (§3.12);
                 // the /onus/stats/ time-series is a best-effort supplement.
-                liveState = try await connection.onu.state(id: onuId)
+                let state = try await connection.onu.state(id: onuId)
-                stats = (try? await connection.onu.stats(id: onuId, lastHours: 24)) ?? []
+                let samples = (try? await connection.onu.stats(id: onuId, lastHours: 24)) ?? []
-            case .config: config = try await connection.onu.config(id: onuId)
+                guard current() else { return }
-            case .cpe:    cpes   = try await connection.onu.cpes(id: onuId)
+                liveState = state
-            case .alarms: alarms = try await connection.onu.alarmHistories(
+                stats = samples
-                                query: queryForONU()).sorted { $0.severity.rank < $1.severity.rank }
+            case .config:
-            case .logs:   logs   = try await connection.onu.logs(id: onuId, lastHours: 24)
+                let doc = try await connection.onu.config(id: onuId)
+                guard current() else { return }
+                config = doc
+            case .cpe:
+                let list = try await connection.onu.cpes(id: onuId)
+                guard current() else { return }
+                cpes = list
+            case .alarms:
+                let list = try await connection.onu.alarmHistories(query: queryForONU())
+                    .sorted { $0.severity.rank < $1.severity.rank }
+                guard current() else { return }
+                alarms = list
+            case .logs:
+                let list = try await connection.onu.logs(id: onuId, lastHours: 24)
+                guard current() else { return }
+                logs = list
             }
             phase = .loaded
         } catch {
+            guard current() else { return }
             phase = .failed((error as? APIError)?.localizedDescription ?? error.localizedDescription)
         }
     }
 
-    /// Filter alarm-history list to this ONU. Reconcile the key with the real
+    /// Filter the fleet-wide alarm-history list to this ONU. ⚠️ The `_id` key is
-    /// document shape; `_id` is a safe default for the per-ONU collection.
+    /// UNVERIFIED — if it's wrong the server ignores the filter and returns EVERY
+    /// ONU's alarms into this detail screen (no error). Confirm the real key (or
+    /// switch to the per-id `.onuAlarmHistory(id:)` endpoint) against openapi.json /
+    /// a live response before trusting this tab.
     private func queryForONU() -> APIQuery {
         var q = APIQuery()
         q.query = ["_id": onuId]

ONUListViewModel.swift

@@ -12,6 +12,8 @@ final class ONUListViewModel {
     let stateFilter: ONULifecycleState?
 
     private let connection: MCMSConnection
+    /// Bumped per load so an overlapping/stale fetch can't commit over a newer one.
+    private var loadGeneration = 0
     init(connection: MCMSConnection, stateFilter: ONULifecycleState? = nil) {
         self.connection = connection
         self.stateFilter = stateFilter
@@ -32,13 +34,15 @@ final class ONUListViewModel {
     }
 
     func load() async {
+        loadGeneration += 1
+        let gen = loadGeneration
         phase = .loading
         do {
             let fetched = try await connection.onu.allStates()
             // Registration lives on OLT-STATE, operator names on ONU-CFG. Both best-effort.
             let registration = (try? await connection.olt.registrationMap()) ?? [:]
             let names = (try? await connection.onu.nameMap()) ?? [:]
-            onus = fetched
+            let merged = fetched
                 .map { onu in
                     var onu = onu
                     onu.resolvedLifecycle = registration[onu.id]
@@ -46,8 +50,11 @@ final class ONUListViewModel {
                     return onu
                 }
                 .sorted { $0.displayName.localizedCaseInsensitiveCompare($1.displayName) == .orderedAscending }
+            guard gen == loadGeneration, !Task.isCancelled else { return }
+            onus = merged
             phase = .loaded
         } catch {
+            guard gen == loadGeneration, !Task.isCancelled else { return }
             phase = .failed((error as? APIError)?.localizedDescription ?? error.localizedDescription)
         }
     }

ONURepository.swift

@@ -14,7 +14,7 @@ final class ONURepository {
 
     /// Fetch every ONU state, paging through with the `next` cursor.
     func allStates() async throws -> [ONUStateDoc] {
-        try await client.getAll(.onuStates, idOf: { $0.id })
+        try await client.getAll(.onuStates, idOf: { $0.documentId })
     }
 
     func configs(query: APIQuery = .empty) async throws -> [ONUConfigDoc] {
@@ -26,7 +26,7 @@ final class ONURepository {
     func nameMap() async throws -> [String: String] {
         var query = APIQuery()
         query.projection = ["ONU.Name": 1]
-        let configs: [ONUConfigDoc] = try await client.getAll(.onuConfigs, baseQuery: query, idOf: { $0.id })
+        let configs: [ONUConfigDoc] = try await client.getAll(.onuConfigs, baseQuery: query, idOf: { $0.documentId })
         return configs.reduce(into: [:]) { map, config in
             if let name = config.name, !name.isEmpty { map[config.id] = name }
         }

ServerTrustEvaluator.swift

@@ -84,16 +84,69 @@ final class ServerTrustEvaluator: NSObject, URLSessionDelegate {
         }
     }
 
-    /// Base64 of SHA-256 over the DER-encoded SubjectPublicKeyInfo's key bits.
+    /// Base64 of SHA-256 over the DER-encoded **SubjectPublicKeyInfo**, i.e. the
-    /// (Capture once with `openssl` and store as a pin; this returns the raw
+    /// standard public-key pin. `SecKeyCopyExternalRepresentation` returns only the
-    /// public-key hash for comparison.)
+    /// raw key (PKCS#1 `RSAPublicKey` for RSA, the `04||X||Y` point for EC) — NOT
+    /// the SPKI — so we prepend the algorithm-specific ASN.1 SPKI header before
+    /// hashing. The result matches the canonical capture:
+    ///
+    ///   openssl s_client -connect host:443 </dev/null 2>/dev/null \
+    ///     | openssl x509 -pubkey -noout \
+    ///     | openssl pkey -pubin -outform der \
+    ///     | openssl dgst -sha256 -binary | base64
+    ///
+    /// Returns nil for key types/sizes without a known header (caller fails closed).
     static func publicKeySHA256Base64(for certificate: SecCertificate) -> String? {
         guard let key = SecCertificateCopyKey(certificate),
-              let data = SecKeyCopyExternalRepresentation(key, nil) as Data? else {
+              let raw = SecKeyCopyExternalRepresentation(key, nil) as Data?,
+              let attrs = SecKeyCopyAttributes(key) as? [String: Any],
+              let keyType = attrs[kSecAttrKeyType as String] as? String,
+              let keySize = attrs[kSecAttrKeySizeInBits as String] as? Int,
+              let header = spkiHeader(keyType: keyType, keySizeInBits: keySize)
+        else { return nil }
+        var spki = Data(header)
+        spki.append(raw)
+        return CryptoSHA256.base64(of: spki)
+    }
+
+    /// ASN.1 SubjectPublicKeyInfo prefix for the raw key returned by
+    /// `SecKeyCopyExternalRepresentation`, keyed by (algorithm, key size). These
+    /// are the fixed, well-known DER headers; the raw key bits follow.
+    private static func spkiHeader(keyType: String, keySizeInBits: Int) -> [UInt8]? {
+        if keyType == (kSecAttrKeyTypeRSA as String) {
+            switch keySizeInBits {
+            case 2048: return rsa2048SPKIHeader
+            case 3072: return rsa3072SPKIHeader
+            case 4096: return rsa4096SPKIHeader
+            default: return nil
+            }
+        }
+        if keyType == (kSecAttrKeyTypeECSECPrimeRandom as String) {
+            switch keySizeInBits {
+            case 256: return ecP256SPKIHeader
+            case 384: return ecP384SPKIHeader
+            default: return nil
+            }
+        }
         return nil
     }
-        return CryptoSHA256.base64(of: data)
+
-    }
+    private static let rsa2048SPKIHeader: [UInt8] = [
+        0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
+        0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0f, 0x00]
+    private static let rsa3072SPKIHeader: [UInt8] = [
+        0x30, 0x82, 0x01, 0xa2, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
+        0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x8f, 0x00]
+    private static let rsa4096SPKIHeader: [UInt8] = [
+        0x30, 0x82, 0x02, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
+        0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x02, 0x0f, 0x00]
+    private static let ecP256SPKIHeader: [UInt8] = [
+        0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02,
+        0x01, 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03,
+        0x42, 0x00]
+    private static let ecP384SPKIHeader: [UInt8] = [
+        0x30, 0x76, 0x30, 0x10, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02,
+        0x01, 0x06, 0x05, 0x2b, 0x81, 0x04, 0x00, 0x22, 0x03, 0x62, 0x00]
 }
 
 /// Minimal SHA-256 wrapper using CryptoKit.