backlog: relay+mirror moved to Proxmox CT 111 (fuelboard-relay), live push verified

A history fetch that comes back empty BECAUSE the mirror is unreachable
(pointer probe failed) was only an in-sheet retry card — no global signal.
Now it also raises the red connection banner ('Check your internet
connection / Tap to try again'), so a network problem is visible on every
tab, not just inside the Trends sheet. A successful load clears the
banner (only when the banner is the connection banner — never clobbers
the offline-dump banner).

- TrendsView: onHistoryUnavailable/onHistoryRecovered closures fired from
  load() (loadFailed -> unavailable; hasAnyData -> recovered);
  -forceHistoryFailure QA hook (forces the unreachable state, skips
  auto-refresh like the other force-* hooks)
- FavouritesView: closures threaded through the Trends sheet init
- ContentView: wires them to dataStatus (.live -> .connectionProblem on
  failure; recovered clears only .connectionProblem)
- fuelboard-development skill: hook + wiring documented

BACKLOG.md

@@ -13,20 +13,30 @@ Status: TODO / IN PROGRESS / DONE / BLOCKED.
 
 ## P1 — Soon
 
-- [ ] **Move relay + mirror off the Mac mini (plan for 2026-08-16)** — dedicated
+- [x] **Move relay + mirror off the Mac mini (DONE 2026-08-16)** — dedicated
   Debian 13 LXC on Proxmox via community-scripts/ProxmoxVE `ct/debian.sh`
-  (CT ~110, hostname `fuelboard-relay`, 1 core/1 GB/8 GB, static IP
-  ~192.168.1.150, plain LXC — NO Docker layer). Scope: relay AND mirror both
-  move (full Mac independence; relay binds loopback only, GitHub is the only
-  public surface). Steps: user creates CT on pve → install Python (trixie =
-  3.13 vs Mac 3.14 — verify relay boots) + relay source + `.env` (GOV.UK
-  token) → copy deploy key `~/.ssh/fuelboard_deploy` + `github-fuelboard-data`
-  ssh config → systemd `fuelboard-relay.service` (Restart=always,
-  127.0.0.1:8789/8788) + `fuelboard-mirror.timer` (10:00 + 16:00) + service →
-  relocate `mirror_push.py` (RELAY line → localhost on CT) + fuelboard-data
-  clone → verify one live push → remove Mac launchd
-  `com.apt.fuelboard-{relay,mirror}`. Open: confirm IP; logs move to
-  journalctl.
+  (CT **111**, hostname **`fuelboard-relay`**, 1 core/512 MB/2 GB, static IP
+  **192.168.1.113**, plain LXC — NO Docker layer). Scope: relay AND mirror
+  both moved (full Mac independence; relays bind **loopback only**, GitHub is
+  the only public surface). What landed: Python 3.13.5 (trixie) boots both
+  relays (relay 8788 demo/CSV + relay-api 8789 `source: api`, 8,024 stations,
+  ~2 min first sync, 0 failures); source at `/root/workspace/fuelboard-{relay,relay-api}`
+  (venvs + pip, `.env` chmod 600); deploy key `fuelboard_deploy` +
+  `github-fuelboard-data` ssh config + `fuelboard-data` clone at
+  `/root/workspace/fuelboard-data` (origin = ssh alias, green + synced);
+  `mirror_push.py` → `/root/scripts/mirror_push.py` (RELAY line already
+  `127.0.0.1:8789`); systemd `fuelboard-relay.service` +
+  `fuelboard-relay-api.service` (Restart=always, `--host 127.0.0.1`) +
+  `fuelboard-mirror.service` (oneshot) + `.timer` (10:00 + 16:00, Persistent,
+  armed — next Mon 10:00); first live push VERIFIED from outside
+  (commit `735a292`, latest.json `data_updated 16:50:53Z`); Mac launchd
+  `com.apt.fuelboard-{relay,relay-api,mirror}` unloaded + plists parked in
+  `~/Library/LaunchAgents/fuelboard-migrated-to-ct/`; editor 8790 + IPA 8765
+  stay on the Mac; price watchdog `relay_price_watchdog.py` now fetches via
+  SSH (`~/.ssh/fuelboard_ct` → `/root/scripts/watchdog_fetch.py`). Logs via
+  `journalctl -u fuelboard-*` on the CT; SSH into CT: `ssh -i ~/.ssh/fuelboard_ct root@192.168.1.113`.
+  **Open: rootfs is 2 GB (1.1 GB free) — mirror retention ~940 MB will get
+  tight; run `pct resize 111 rootfs 8G` on pve when convenient.**
 
 - [x] **Siri: "Cheapest [fuel] near me"** — `AppShortcutsProvider` + `CheapestFuelIntent`
   (App Intents, iOS 16+), dialog + price-card snippet, cached full-UK dump first

FuelBoard/BundledDumpProvider.swift

@@ -15,4 +15,14 @@ enum BundledDumpProvider {
         guard let asset = NSDataAsset(name: "FuelBoardDump") else { return nil }
         return try? FuelPriceProvider.decodeStations(from: asset.data)
     }
+
+    /// The GOV.UK `data_updated` stamp from the bundled envelope (ISO 8601).
+    /// Labels the offline-data banner honestly ("Offline data from 15 Aug")
+    /// instead of presenting the build's snapshot as live.
+    static var dataUpdatedStamp: String? {
+        guard let asset = NSDataAsset(name: "FuelBoardDump"),
+              let obj = try? JSONSerialization.jsonObject(with: asset.data)
+                  as? [String: Any] else { return nil }
+        return obj["data_updated"] as? String
+    }
 }

FuelBoard/ContentView.swift

@@ -32,6 +32,19 @@ struct ContentView: View {
     }
     @State private var isLoading = false
     @State private var statusMessage = ""
+    /// What data is on screen, driving which (if any) status banner shows
+    /// above the tabs:
+    ///  - `.live`: fetched or cached data — nothing to say.
+    ///  - `.offlineDump(date)`: serving the BUNDLED no-network snapshot —
+    ///    the banner labels it honestly with the snapshot's own date.
+    ///  - `.connectionProblem`: fetch failed but a saved cache is showing —
+    ///    the banner says to check connectivity (tap = retry).
+    enum DataSourceStatus: Equatable {
+        case live
+        case offlineDump(date: String)
+        case connectionProblem
+    }
+    @State private var dataStatus: DataSourceStatus = .live
     @State private var showOnboarding = false
     @State private var showWidgetMock = false
     @State private var selectedTab = 0
@@ -139,6 +152,30 @@ struct ContentView: View {
     }
 
     var body: some View {
+        VStack(spacing: 0) {
+            switch dataStatus {
+            case .offlineDump(let date):
+                let title = offlineTitle(date: date)
+                statusBanner(
+                    icon: "wifi.slash",
+                    tint: .orange,
+                    title: title,
+                    subtitle: NSLocalizedString("Pull to refresh on the Stations tab", comment: ""),
+                    accessibilityLabel: date.isEmpty
+                        ? NSLocalizedString("Offline data. Pull to refresh on the Stations tab", comment: "")
+                        : String(format: NSLocalizedString("Offline data from %@. Pull to refresh on the Stations tab", comment: ""), date)
+                )
+            case .connectionProblem:
+                statusBanner(
+                    icon: "wifi.exclamationmark",
+                    tint: .red,
+                    title: NSLocalizedString("Check your internet connection", comment: ""),
+                    subtitle: NSLocalizedString("Tap to try again", comment: ""),
+                    accessibilityLabel: NSLocalizedString("Check your internet connection. Tap to try again", comment: "")
+                )
+            case .live:
+                EmptyView()
+            }
             TabView(selection: $selectedTab) {
             stationsTab
                 .tabItem { Label("Stations", systemImage: "fuelpump.fill") }
@@ -204,6 +241,19 @@ struct ContentView: View {
                 default: selectedTab = 0
                 }
             }
+            // `-forceOfflineDump` / `-forceConnectionProblem` simulate the two
+            // failure legs for the screenshot harness. The auto-refresh below
+            // is skipped so the banner stays up (a live fetch would clear it).
+            if args.contains("-forceOfflineDump") {
+                stations = BundledDumpProvider.stations ?? SampleFuelProvider.sampleStations
+                dataStatus = .offlineDump(date: FuelStore.offlineDataLabel(from: BundledDumpProvider.dataUpdatedStamp) ?? "")
+            }
+            if args.contains("-forceConnectionProblem") {
+                stations = FuelStore.loadStations().isEmpty
+                    ? (BundledDumpProvider.stations ?? SampleFuelProvider.sampleStations)
+                    : FuelStore.loadStations()
+                dataStatus = .connectionProblem
+            }
             // Onboarding runs first on a fresh install — it owns the initial
             // permission prompts (location, notifications, and the data/local
             // network probe on the Data page). Location tracking and the first
@@ -233,7 +283,10 @@ struct ContentView: View {
                 monitor.setEnabled(alertsEnabled)
                 updateLiveActivity()
                 // Refresh only when the cache is stale (twice-a-day policy).
+                // Skipped under the force-* hooks so the banner stays up.
+                if !args.contains("-forceOfflineDump") && !args.contains("-forceConnectionProblem") && !args.contains("-forceHistoryFailure") {
                     Task { await refresh() }
+                }
             } else {
                 showOnboarding = true
             }
@@ -367,6 +420,59 @@ struct ContentView: View {
             // so reading storage here could push the OLD style.
             updateLiveActivity(priceDisplayStyleOverride: newValue)
         }
+        }  // VStack: status banner + TabView
+        .animation(.spring(response: 0.3, dampingFraction: 0.8), value: dataStatus)
+    }
+
+    /// The banner title for the bundled-snapshot case: date when the stamp
+    /// parsed, plain "Offline data" otherwise.
+    private func offlineTitle(date: String) -> String {
+        date.isEmpty
+            ? NSLocalizedString("Offline data", comment: "")
+            : String(format: NSLocalizedString("Offline data from %@", comment: ""), date)
+    }
+
+    /// Shared status-strip chrome: a tappable card pinned above the tabs.
+    /// Tapping retries the live fetch from ANY screen — no pull gesture
+    /// needed, so the offline banner isn't trapped on the Stations tab.
+    private func statusBanner(icon: String, tint: Color, title: String, subtitle: String, accessibilityLabel: String) -> some View {
+        Button {
+            Task { await refresh(force: true) }
+        } label: {
+            HStack(spacing: 10) {
+                Image(systemName: icon)
+                    .font(.system(size: 17, weight: .semibold))
+                    .foregroundStyle(tint)
+                    .frame(width: 30)
+                VStack(alignment: .leading, spacing: 2) {
+                    Text(title)
+                        .font(.subheadline.weight(.semibold))
+                        .foregroundStyle(.primary)
+                    Text(subtitle)
+                        .font(.caption)
+                        .foregroundStyle(.secondary)
+                }
+                Spacer()
+                Image(systemName: "arrow.clockwise")
+                    .font(.system(size: 14, weight: .semibold))
+                    .foregroundStyle(tint)
+            }
+            .padding(.horizontal, 14)
+            .padding(.vertical, 10)
+            .background(
+                RoundedRectangle(cornerRadius: 12, style: .continuous)
+                    .fill(Color(.secondarySystemGroupedBackground))
+                    .overlay(
+                        RoundedRectangle(cornerRadius: 12, style: .continuous)
+                            .stroke(tint.opacity(0.35), lineWidth: 1)
+                    )
+            )
+            .padding(.horizontal, 12)
+            .padding(.bottom, 6)
+        }
+        .buttonStyle(.plain)
+        .accessibilityLabel(accessibilityLabel)
+        .transition(.move(edge: .top).combined(with: .opacity))
     }
 
     /// Pushes the current best-in-radius station into the Live Activity.
@@ -420,7 +526,9 @@ struct ContentView: View {
             distanceUnit: distanceUnit,
             priceDisplayStyle: priceDisplayStyle,
             onToggleFavourite: toggleFavourite,
-            onReorder: reorderFavourites
+            onReorder: reorderFavourites,
+            onHistoryUnavailable: { if dataStatus == .live { dataStatus = .connectionProblem } },
+            onHistoryRecovered: { if dataStatus == .connectionProblem { dataStatus = .live } }
         )
     }
 
@@ -504,14 +612,26 @@ struct ContentView: View {
             FuelStore.saveFavourites(refreshedFavourites)
             WidgetCenter.shared.reloadAllTimelines()
             statusMessage = "Loaded \(fetched.count) stations · \(Date().formatted(date: .omitted, time: .shortened))"
+            // Live data restored — any status banner no longer applies.
+            dataStatus = .live
         } catch {
             statusMessage = "Live fetch failed: \(error.localizedDescription). Showing cached data."
             if FuelStore.loadStations().isEmpty {
                 // No cached prices — last resort is the bundled REAL dump
-                // (stale but genuine), then the demo sample set.
-                stations = BundledDumpProvider.stations ?? SampleFuelProvider.sampleStations
+                // (stale but genuine), then the demo sample set. The banner
+                // labels the bundled snapshot honestly with its own date.
+                if let dump = BundledDumpProvider.stations {
+                    stations = dump
+                    dataStatus = .offlineDump(date: FuelStore.offlineDataLabel(from: BundledDumpProvider.dataUpdatedStamp) ?? "")
                 } else {
+                    stations = SampleFuelProvider.sampleStations
+                    dataStatus = .live
+                }
+            } else {
+                // Saved prices are still on screen — but the fetch failed, so
+                // say so: a stale cache must not look like a live app.
                 stations = FuelStore.loadStations()
+                dataStatus = .connectionProblem
             }
         }
         // Keep monitor geofences in sync with the freshest data.

FuelBoard/FavouritesView.swift

@@ -17,6 +17,10 @@ struct FavouritesView: View {
     var onToggleFavourite: (FuelStation, FuelType) -> Void = { _, _ in }
     /// Persists a reordered favourites array (after drag-and-drop).
     var onReorder: ([FavouriteEntry]) -> Void = { _ in }
+    /// Propagated from ContentView — Trends' history failure with no data
+    /// raises the global connection banner; recovery clears it.
+    var onHistoryUnavailable: (() -> Void)? = nil
+    var onHistoryRecovered: (() -> Void)? = nil
 
     /// Fuel types that currently have at least one favourite — these are the
     /// only tabs shown (a fuel with no favourites gets no tab).
@@ -62,7 +66,9 @@ struct FavouritesView: View {
          distanceUnit: DistanceUnit,
          priceDisplayStyle: PriceDisplayStyle,
          onToggleFavourite: @escaping (FuelStation, FuelType) -> Void = { _, _ in },
-         onReorder: @escaping ([FavouriteEntry]) -> Void = { _ in }) {
+         onReorder: @escaping ([FavouriteEntry]) -> Void = { _ in },
+         onHistoryUnavailable: (() -> Void)? = nil,
+         onHistoryRecovered: (() -> Void)? = nil) {
         self.favourites = favourites
         self.selectedFuel = selectedFuel
         self.location = location
@@ -70,6 +76,8 @@ struct FavouritesView: View {
         self.priceDisplayStyle = priceDisplayStyle
         self.onToggleFavourite = onToggleFavourite
         self.onReorder = onReorder
+        self.onHistoryUnavailable = onHistoryUnavailable
+        self.onHistoryRecovered = onHistoryRecovered
         _fuel = State(initialValue: selectedFuel)
     }
 
@@ -158,9 +166,18 @@ struct FavouritesView: View {
                 TrendsView(
                     favourites: favourites,
                     selectedFuel: activeFuel,
-                    priceDisplayStyle: priceDisplayStyle
+                    priceDisplayStyle: priceDisplayStyle,
+                    onHistoryUnavailable: onHistoryUnavailable,
+                    onHistoryRecovered: onHistoryRecovered
                 )
             }
+            .onAppear {
+                // QA hook: launch with `-showTrends` to open the sheet
+                // without a tap (same pattern as -showKeySheet).
+                if ProcessInfo.processInfo.arguments.contains("-showTrends") {
+                    showTrends = true
+                }
+            }
         }
     }
 }

FuelBoard/SettingsView.swift

@@ -298,25 +298,47 @@ struct SettingsView: View {
                 }
 
                 Section {
+                    VStack(spacing: 10) {
                         ForEach(TipStore.tiers) { tier in
                             Button {
                                 Task { await tipStore.purchase(tier) }
                             } label: {
-                            HStack {
+                                HStack(spacing: 12) {
+                                    Image(systemName: "fuelpump.fill")
+                                        .font(.title3)
+                                        .foregroundStyle(tier.accent)
+                                        .frame(width: 34)
                                     VStack(alignment: .leading, spacing: 2) {
                                         Text(tier.name)
+                                            .font(.headline)
                                         Text(tier.blurb)
                                             .font(.caption)
                                             .foregroundStyle(.secondary)
                                     }
-                                Spacer()
+                                    Spacer(minLength: 8)
                                     Text(tipStore.displayPrice(for: tier))
-                                    .foregroundStyle(.secondary)
+                                        .font(.headline.weight(.bold))
+                                        .foregroundStyle(tier.accent)
                                         .monospacedDigit()
                                 }
+                                .padding(.horizontal, 14)
+                                .padding(.vertical, 12)
+                                .frame(maxWidth: .infinity, alignment: .leading)
+                                .background(
+                                    RoundedRectangle(cornerRadius: 12)
+                                        .fill(Color(.secondarySystemGroupedBackground))
+                                        .overlay(
+                                            RoundedRectangle(cornerRadius: 12)
+                                                .fill(tier.accent.opacity(0.05))
+                                        )
+                                )
                             }
+                            .buttonStyle(.plain)
                             .disabled(tipStore.purchaseInProgress)
                         }
+                    }
+                    .listRowBackground(Color.clear)
+                    .listRowInsets(EdgeInsets(top: 4, leading: 16, bottom: 4, trailing: 16))
                 } header: {
                     Text("Support FuelBoard")
                 } footer: {
@@ -569,15 +591,19 @@ final class TipStore: ObservableObject {
         let name: String
         let blurb: String
         let fallbackPrice: String
+        let accent: Color       // card/price accent (matches the fuel palette)
     }
 
     static let tiers: [TipTier] = [
         TipTier(id: "com.apt.fuelboard.tip099", name: "Splash & Dash",
-                blurb: "Just enough to keep things moving.", fallbackPrice: "£0.99"),
+                blurb: "Just enough to keep things moving.", fallbackPrice: "£0.99",
+                accent: Color(red: 0.39, green: 0.82, blue: 1.0)),    // #64D2FF
         TipTier(id: "com.apt.fuelboard.tip299", name: "Half a Tank",
-                blurb: "A generous top-up for development.", fallbackPrice: "£2.99"),
+                blurb: "A generous top-up for development.", fallbackPrice: "£2.99",
+                accent: Color(red: 0.19, green: 0.82, blue: 0.35)),   // #30D158
         TipTier(id: "com.apt.fuelboard.tip499", name: "Fill 'Er Up",
-                blurb: "Keeping the app on the road.", fallbackPrice: "£4.99"),
+                blurb: "Keeping the app on the road.", fallbackPrice: "£4.99",
+                accent: Color(red: 1.0, green: 0.84, blue: 0.04)),    // #FFD60A
     ]
 
     @Published private(set) var products: [String: Product] = [:]

FuelBoard/StationsView.swift

@@ -193,39 +193,58 @@ struct StationsView: View {
             .sheet(isPresented: $showKey) {
                 NavigationStack {
                     List {
-                        Section("Key") {
-                            HStack(spacing: 8) {
-                                Circle().fill(.green).frame(width: 12, height: 12)
-                                Text("Best value — within 1.5p of the cheapest")
-                                    .font(.caption)
-                            }
-                            HStack(spacing: 8) {
-                                Circle().fill(.orange).frame(width: 12, height: 12)
-                                Text("Okay — within 4p of the cheapest")
-                                    .font(.caption)
-                            }
-                            HStack(spacing: 8) {
-                                Circle().fill(.red).frame(width: 12, height: 12)
-                                Text("Pricey — more than 4p over the cheapest")
-                                    .font(.caption)
-                            }
-                            HStack(spacing: 8) {
+                        Section {
+                            VStack(spacing: 10) {
+                                keyCard(
+                                    icon: "checkmark.circle.fill", color: .green,
+                                    title: "Best value", blurb: "Within 1.5p of the cheapest",
+                                    threshold: "≤1.5p")
+                                keyCard(
+                                    icon: "equal.circle.fill", color: .orange,
+                                    title: "Okay", blurb: "Within 4p of the cheapest",
+                                    threshold: "≤4p")
+                                keyCard(
+                                    icon: "exclamationmark.circle.fill", color: .red,
+                                    title: "Pricey", blurb: "More than 4p over the cheapest",
+                                    threshold: ">4p")
+                                Rectangle()
+                                    .fill(Color(.separator))
+                                    .frame(height: 0.5)
+                                    .padding(.vertical, 2)
+                                HStack(spacing: 12) {
                                     Text("TOP")
                                         .font(.caption2.bold())
-                                    .padding(.horizontal, 5)
-                                    .padding(.vertical, 1)
-                                    .background(Capsule().fill(.blue.opacity(0.15)))
+                                        .padding(.horizontal, 7)
+                                        .padding(.vertical, 3)
+                                        .background(Capsule().fill(.blue.opacity(0.16)))
                                         .foregroundStyle(.blue)
                                     Text("Top result for the current sort")
-                                    .font(.caption)
+                                        .font(.subheadline.weight(.semibold))
+                                    Spacer(minLength: 0)
                                 }
-                            HStack(spacing: 8) {
+                                .padding(.horizontal, 14)
+                                .padding(.vertical, 12)
+                                .keyCardFill(color: .blue)
+                                HStack(spacing: 12) {
                                     Image(systemName: "star.fill")
-                                    .font(.caption2)
+                                        .font(.title3)
                                         .foregroundStyle(.yellow)
+                                        .frame(width: 34)
                                     Text("Star a station to add it to Favourites")
-                                    .font(.caption)
+                                        .font(.subheadline.weight(.semibold))
+                                    Spacer(minLength: 0)
                                 }
+                                .padding(.horizontal, 14)
+                                .padding(.vertical, 12)
+                                .keyCardFill(color: .yellow)
+                                Text("Colours match each station's rating on the list")
+                                    .font(.footnote)
+                                    .foregroundStyle(.secondary)
+                                    .frame(maxWidth: .infinity)
+                                    .padding(.top, 4)
+                            }
+                            .listRowBackground(Color.clear)
+                            .listRowInsets(EdgeInsets(top: 4, leading: 16, bottom: 4, trailing: 16))
                         }
                     }
                     .navigationTitle("Key")
@@ -236,10 +255,52 @@ struct StationsView: View {
                         }
                     }
                 }
-                .presentationDetents([.medium])
+                .presentationDetents([.fraction(0.6)])
+                .presentationBackground(Color(UIColor.systemGroupedBackground))
             }
         }
     }
+
+    /// One price-rating card for the Key sheet: accent icon, title + blurb,
+    /// and the rating threshold in the accent colour (mirrors the tip cards).
+    private func keyCard(icon: String, color: Color, title: String, blurb: String, threshold: String) -> some View {
+        HStack(spacing: 12) {
+            Image(systemName: icon)
+                .font(.title3)
+                .foregroundStyle(color)
+                .frame(width: 34)
+            VStack(alignment: .leading, spacing: 2) {
+                Text(LocalizedStringKey(title)).font(.headline)
+                Text(LocalizedStringKey(blurb))
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
+            Spacer(minLength: 8)
+            HStack(spacing: 6) {
+                Circle().fill(color).frame(width: 10, height: 10)
+                Text(threshold)
+                    .font(.headline.weight(.bold))
+                    .foregroundStyle(color)
+                    .monospacedDigit()
+            }
+        }
+        .padding(.horizontal, 14)
+        .padding(.vertical, 10)
+        .frame(maxWidth: .infinity, alignment: .leading)
+        .keyCardFill(color: color)
+    }
+}
+
+/// Card background shared by the Key sheet cards — subtle accent tint over
+/// the grouped background, matching the tip-section card style.
+private extension View {
+    func keyCardFill(color: Color) -> some View {
+        background(
+            RoundedRectangle(cornerRadius: 12)
+                .fill(Color(.secondarySystemGroupedBackground))
+                .overlay(RoundedRectangle(cornerRadius: 12).fill(color.opacity(0.08)))
+        )
+    }
 }
 
 // MARK: - Fuel-type iconography (app target only — FuelStore.swift is Foundation-only)

FuelBoard/TrendsView.swift

@@ -16,6 +16,12 @@ struct TrendsView: View {
     let selectedFuel: FuelType
     let priceDisplayStyle: PriceDisplayStyle
 
+    /// Propagated up to ContentView so a price-history fetch that fails with
+    /// NO data raises the global connection banner (same red banner as the
+    /// stations fetch). `onHistoryRecovered` fires once data loads again.
+    var onHistoryUnavailable: (() -> Void)? = nil
+    var onHistoryRecovered: (() -> Void)? = nil
+
     @Environment(\.dismiss) private var dismiss
 
     @State private var fuel: FuelType = .e10
@@ -80,6 +86,15 @@ struct TrendsView: View {
     }
 
     private func load() async {
+        // QA hook: force the unreachable state for screenshots (same pattern
+        // as -showTrends / -forceConnectionProblem). Runs before the fetch so
+        // the retry state renders immediately with no spinner flash.
+        if ProcessInfo.processInfo.arguments.contains("-forceHistoryFailure") {
+            series = []
+            loadFailed = true
+            onHistoryUnavailable?()
+            return
+        }
         isLoading = true
         loadFailed = false
         defer { isLoading = false }
@@ -98,6 +113,14 @@ struct TrendsView: View {
             loadFailed = firstSnapshot == nil
         }
         series = fetched
+        // A failure with no data IS a connection problem — raise the global
+        // banner so the user isn't stuck with a silent retry state. Success
+        // clears it (only if the banner is the connection banner).
+        if loadFailed {
+            onHistoryUnavailable?()
+        } else if hasAnyData {
+            onHistoryRecovered?()
+        }
     }
 
     private func yLabel(_ pence: Double) -> String {
@@ -175,6 +198,7 @@ struct TrendsView: View {
                 VStack(spacing: 12) {
                     chart
                     legend
+                    legendFooter
                 }
             }
         }
@@ -205,15 +229,23 @@ struct TrendsView: View {
     }
 
     private var chart: some View {
-        Chart(displaySeries) { history in
+        // NOTE: each LineMark MUST carry an explicit `series:` — without it
+        // Swift Charts merges every station's points into ONE polyline
+        // (points connect across stations, so only the first station's line
+        // is recognisable). The outer ForEach keeps one chart with N series;
+        // per-mark foregroundStyle then colours each series from the palette.
+        Chart {
+            ForEach(displaySeries) { history in
                 ForEach(history.points) { point in
                     LineMark(
                         x: .value("Date", point.date),
-                    y: .value("Price", point.pence)
+                        y: .value("Price", point.pence),
+                        series: .value("Station", history.name)
                     )
                     .foregroundStyle(seriesColor(index(of: history.stationID)))
                 }
             }
+        }
         .chartXAxis {
             AxisMarks(values: .stride(by: .day, count: xStride)) { _ in
                 AxisGridLine()
@@ -248,10 +280,41 @@ struct TrendsView: View {
                     Text(history.name)
                         .font(.caption)
                         .lineLimit(1)
+                    if let avg = FuelHistoryStore.averagePence(history.points) {
+                        Text(legendFigure(avg))
+                            .font(.caption)
+                            .foregroundStyle(.secondary)
+                            .monospacedDigit()
+                    }
                     Spacer()
                 }
             }
         }
         .padding(.horizontal, 4)
     }
+
+    /// The bracket figure in the chart key: absolute pence in Price mode,
+    /// signed pence above the day's cheapest in vs-cheapest mode — always
+    /// pence, matching the list rows (the y-axis follows the display toggle).
+    private func legendFigure(_ pence: Double) -> String {
+        switch mode {
+        case .price:
+            return String(format: "%.1fp", pence)
+        case .vsCheapest:
+            return pence > 0 ? String(format: "+%.1fp", pence) : String(format: "%.1fp", pence)
+        }
+    }
+
+    /// One-line descriptor under the key so the brackets are self-explanatory.
+    private var legendFooter: some View {
+        Group {
+            if mode == .price {
+                Text("Average price over the days shown")
+            } else {
+                Text("Average pence above the day's cheapest favourite")
+            }
+        }
+        .font(.caption2)
+        .foregroundStyle(.secondary)
+    }
 }

FuelBoard/en.lproj/Localizable.strings

@@ -23,11 +23,15 @@
 "Show %lld more (%lld remaining)" = "Show %lld more (%lld remaining)";
 "All %lld stations shown" = "All %lld stations shown";
 "Key" = "Key";
-"Best value — within 1.5p of the cheapest" = "Best value — within 1.5p of the cheapest";
-"Okay — within 4p of the cheapest" = "Okay — within 4p of the cheapest";
-"Pricey — more than 4p over the cheapest" = "Pricey — more than 4p over the cheapest";
+"Best value" = "Best value";
+"Within 1.5p of the cheapest" = "Within 1.5p of the cheapest";
+"Okay" = "Okay";
+"Within 4p of the cheapest" = "Within 4p of the cheapest";
+"Pricey" = "Pricey";
+"More than 4p over the cheapest" = "More than 4p over the cheapest";
 "Top result for the current sort" = "Top result for the current sort";
 "Star a station to add it to Favourites" = "Star a station to add it to Favourites";
+"Colours match each station's rating on the list" = "Colours match each station's rating on the list";
 
 /* Favourites tab */
 "No favourites yet" = "No favourites yet";
@@ -152,3 +156,15 @@
 "No price history yet" = "No price history yet";
 "First snapshot %@ — a few days are needed to draw a trend." = "First snapshot %@ — a few days are needed to draw a trend.";
 "Prices are recorded each day FuelBoard's relay runs — check back in a few days." = "Prices are recorded each day FuelBoard's relay runs — check back in a few days.";
+"Average price over the days shown" = "Average price over the days shown";
+"Average pence above the day's cheapest favourite" = "Average pence above the day's cheapest favourite";
+
+/* Offline data banner */
+"Offline data from %@" = "Offline data from %@";
+"Offline data" = "Offline data";
+"Pull to refresh on the Stations tab" = "Pull to refresh on the Stations tab";
+"Offline data from %@. Pull to refresh on the Stations tab" = "Offline data from %@. Pull to refresh on the Stations tab";
+"Offline data. Pull to refresh on the Stations tab" = "Offline data. Pull to refresh on the Stations tab";
+"Check your internet connection" = "Check your internet connection";
+"Tap to try again" = "Tap to try again";
+"Check your internet connection. Tap to try again" = "Check your internet connection. Tap to try again";

FuelBoardTests/Tests/FuelBoardSharedTests/FuelBoardTests.swift

@@ -587,3 +587,22 @@ final class PriceDisplayTests: XCTestCase {
         XCTAssertEqual(FuelStore.priceTextSpoken(100.9), "£1.009")
     }
 }
+
+// MARK: - Offline data banner label
+
+final class OfflineDataLabelTests: XCTestCase {
+    func testOfflineDataLabelFormatsStampWithFractionalSeconds() {
+        // The bundled dump's real envelope stamp.
+        XCTAssertEqual(FuelStore.offlineDataLabel(from: "2026-08-15T08:46:33.000Z"), "15 Aug")
+    }
+
+    func testOfflineDataLabelToleratesPlainISODate() {
+        XCTAssertEqual(FuelStore.offlineDataLabel(from: "2026-08-15T08:46:33Z"), "15 Aug")
+    }
+
+    func testOfflineDataLabelNilWhenMissingOrUnparseable() {
+        XCTAssertNil(FuelStore.offlineDataLabel(from: nil))
+        XCTAssertNil(FuelStore.offlineDataLabel(from: ""))
+        XCTAssertNil(FuelStore.offlineDataLabel(from: "not-a-date"))
+    }
+}

FuelBoardTests/Tests/FuelBoardSharedTests/FuelHistoryTests.swift

@@ -164,6 +164,29 @@ final class FuelHistoryTests: XCTestCase {
         XCTAssertEqual(pruned.count, days.count)
     }
 
+    // MARK: Chart-key average
+
+    func testAveragePenceEmptyIsNil() {
+        XCTAssertNil(FuelHistoryStore.averagePence([]))
+    }
+
+    func testAveragePenceSinglePoint() {
+        let d = FuelHistoryStore.date(fromDay: "2026-08-15")!
+        XCTAssertEqual(FuelHistoryStore.averagePence([PricePoint(date: d, pence: 156.7)]), 156.7)
+    }
+
+    func testAveragePenceMultiplePoints() {
+        let d1 = FuelHistoryStore.date(fromDay: "2026-08-15")!
+        let d2 = FuelHistoryStore.date(fromDay: "2026-08-16")!
+        // (153.9 + 156.7) / 2 = 155.3 — exact in binary? 153.9+156.7=310.6, /2=155.3
+        let avg = FuelHistoryStore.averagePence([
+            PricePoint(date: d1, pence: 153.9),
+            PricePoint(date: d2, pence: 156.7),
+        ])
+        XCTAssertNotNil(avg)
+        XCTAssertEqual(avg!, 155.3, accuracy: 0.0001)
+    }
+
     // MARK: Mirror URLs
 
     func testHistoryFileURLKeepsBaseLastSegment() {

Shared/FuelHistory.swift

@@ -148,6 +148,13 @@ enum FuelHistoryStore {
         }
     }
 
+    /// Average pence over a series' points; nil when there are no points
+    /// (a station with no data shows no bracket figure in the chart key).
+    static func averagePence(_ points: [PricePoint]) -> Double? {
+        guard !points.isEmpty else { return nil }
+        return points.reduce(0) { $0 + $1.pence } / Double(points.count)
+    }
+
     /// Rebase every station's series so each day's CHEAPEST favourite sits at
     /// 0 and the others show signed pence above it (mirrors the list's
     /// baseline delta pattern). Days where a station has no point are gaps.

Shared/FuelStore.swift

@@ -782,6 +782,27 @@ struct FuelStore {
         loadString(service: dataUpdatedKey)
     }
 
+    /// A short label for the offline-data banner: "15 Aug" from a GOV.UK
+    /// `data_updated` ISO 8601 stamp (with or without fractional seconds).
+    /// Nil when the stamp is missing or unparseable — callers then hide the
+    /// banner rather than label data with a wrong date.
+    static func offlineDataLabel(from stamp: String?) -> String? {
+        guard let stamp, !stamp.isEmpty else { return nil }
+        let withFraction = ISO8601DateFormatter()
+        withFraction.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
+        var date = withFraction.date(from: stamp)
+        if date == nil {
+            let plain = ISO8601DateFormatter()
+            plain.formatOptions = [.withInternetDateTime]
+            date = plain.date(from: stamp)
+        }
+        guard let date else { return nil }
+        let formatter = DateFormatter()
+        formatter.dateFormat = "d MMM"
+        formatter.locale = Locale(identifier: "en_GB")
+        return formatter.string(from: date)
+    }
+
     /// True when the cached data is fresh enough that a scheduled auto-refresh
     /// should be skipped (twice-a-day policy).
     static var isCacheFresh: Bool {