fix: Added LOTW badge for Lotw users colored depending on their last upload

app.go

@@ -41,6 +41,7 @@ import (
 	"hamlog/internal/netctl"
 	"hamlog/internal/operating"
 	"hamlog/internal/pota"
+	"hamlog/internal/lotwusers"
 	"hamlog/internal/powergenius"
 	"hamlog/internal/profile"
 	"hamlog/internal/qslcard"
@@ -422,6 +423,7 @@ type App struct {
 	audioMgr     *audio.Manager
 	qsoRec       *audio.Recorder // continuous QSO recorder (rolling pre-roll)
 	solar        *solar.Manager  // live space-weather (SFI/SSN/A/K) for the header + QSO stamping
+	lotwUsers    *lotwusers.Manager // LoTW user-activity list (badge next to the callsign)
 
 	// NET Control: persistent net definitions/rosters (global JSON) + the live
 	// session (in-memory only — active stations currently in QSO).
@@ -768,6 +770,24 @@ func (a *App) startup(ctx context.Context) {
 	// cty.dat lacks (DXpeditions). Loaded from cache if present; downloaded on
 	// demand. Resolution applied only when the user enables it.
 	a.clublog = clublog.NewManager(clublogAppAPIKey, dataDir)
+
+	// LoTW user-activity list (who's a LoTW user + last upload). Loads the cached
+	// CSV if present, and auto-downloads in the background when it's missing or
+	// older than a week (the ARRL list changes daily). Manual refresh is in
+	// Settings → LoTW.
+	a.lotwUsers = lotwusers.NewManager(dataDir)
+	go func() {
+		if a.lotwUsers.Count() == 0 || time.Since(a.lotwUsers.Updated()) > 7*24*time.Hour {
+			if n, err := a.lotwUsers.Download(context.Background()); err == nil {
+				applog.Printf("lotwusers: auto-downloaded %d LoTW users", n)
+				if a.ctx != nil {
+					wruntime.EventsEmit(a.ctx, "lotwusers:updated")
+				}
+			} else {
+				applog.Printf("lotwusers: auto-download failed: %v", err)
+			}
+		}
+	}()
 	go func() {
 		if err := a.clublog.EnsureLoaded(); err == nil {
 			d, n := a.clublog.Info()
@@ -1734,6 +1754,42 @@ func (a *App) RefreshSolar() {
 	}
 }
 
+// LoTWUserInfo reports whether a callsign is a LoTW user and how recently it
+// uploaded — drives the colour-coded LoTW badge in the entry strip.
+func (a *App) LoTWUserInfo(callsign string) lotwusers.Info {
+	if a.lotwUsers == nil {
+		return lotwusers.Info{DaysAgo: -1}
+	}
+	return a.lotwUsers.Lookup(callsign)
+}
+
+// LoTWUsersStatus is the loaded-list summary for Settings (count + last refresh).
+type LoTWUsersStatus struct {
+	Count   int    `json:"count"`
+	Updated string `json:"updated,omitempty"` // RFC3339, empty if never
+}
+
+// GetLoTWUsersStatus returns how many LoTW callsigns are loaded and when.
+func (a *App) GetLoTWUsersStatus() LoTWUsersStatus {
+	if a.lotwUsers == nil {
+		return LoTWUsersStatus{}
+	}
+	st := LoTWUsersStatus{Count: a.lotwUsers.Count()}
+	if u := a.lotwUsers.Updated(); !u.IsZero() {
+		st.Updated = u.UTC().Format(time.RFC3339)
+	}
+	return st
+}
+
+// DownloadLoTWUsers fetches ARRL's LoTW user-activity list and caches it.
+// Returns the number of callsigns loaded.
+func (a *App) DownloadLoTWUsers() (int, error) {
+	if a.lotwUsers == nil {
+		return 0, fmt.Errorf("not initialized")
+	}
+	return a.lotwUsers.Download(a.ctx)
+}
+
 // StationInfoComputed bundles the data we resolve live from the
 // profile's callsign + grid: country, ARRL DXCC#, CQ zone, ITU zone,
 // lat/lon. Used by the Settings UI to show the "what will be stamped on
@@ -5571,9 +5627,22 @@ func (a *App) applyClublogException(q *qso.QSO, force bool) bool {
 		date = time.Now().UTC()
 	}
 	e, ok := a.clublog.Resolve(q.Callsign, date)
+	if !ok {
+		// No exception COVERS this QSO's date. If the call nonetheless HAS a
+		// date-ranged exception (e.g. G1T = Scotland only from 2024-02-21), then
+		// cty.dat's date-blind "=G1T → Scotland" override is WRONG for an older
+		// QSO — resolve it by ClubLog's date-aware PREFIX table instead (G1 →
+		// England for a 2012 contact). Ordinary calls (no exception) are left to
+		// cty.dat.
+		if a.clublog.HasException(q.Callsign) {
+			if pe, pok := a.clublog.ResolvePrefix(q.Callsign, date); pok {
+				e, ok = pe, true
+			}
+		}
 		if !ok {
 			return false
 		}
+	}
 	q.Country = titleEntity(e.Entity)
 	if e.Cont != "" {
 		q.Continent = e.Cont

frontend/src/App.tsx

@@ -27,6 +27,7 @@ import {
   ListClusterServers, ClusterSpotStatuses, SendClusterSpot,
   GetCATSettings,
   GetSolarData,
+  LoTWUserInfo,
   OperatingDefaultForBand,
   LogUDPLoggedADIF,
   ListCountries,
@@ -383,6 +384,19 @@ export default function App() {
     const id = window.setInterval(load, 60 * 60 * 1000); // hourly fallback; the event refreshes it live
     return () => { off(); window.clearInterval(id); };
   }, []);
+  // LoTW-user lookup for the entered callsign (from the cached ARRL activity list),
+  // debounced. Drives a colour-coded LoTW badge by last-upload recency.
+  const [lotwInfo, setLotwInfo] = useState<{ is_user: boolean; last_upload?: string; days_ago: number } | null>(null);
+  useEffect(() => {
+    const c = callsign.trim();
+    if (!c) { setLotwInfo(null); return; }
+    const run = () => { LoTWUserInfo(c).then((r) => setLotwInfo(r as any)).catch(() => setLotwInfo(null)); };
+    const t = window.setTimeout(run, 300);
+    // Re-run when the background auto-download finishes (so a call typed before
+    // the list loaded gets its badge without re-typing).
+    const off = EventsOn('lotwusers:updated', run);
+    return () => { window.clearTimeout(t); off(); };
+  }, [callsign]);
   const [rotatorHeading, setRotatorHeading] = useState<{ enabled: boolean; ok: boolean; azimuth: number }>({ enabled: false, ok: false, azimuth: 0 });
   const [ubStatus, setUbStatus] = useState<{ enabled: boolean; connected: boolean; direction: number; moving: boolean }>({ enabled: false, connected: false, direction: 0, moving: false });
   const [agStatus, setAgStatus] = useState<AGStatus>({ connected: false, port_a: 0, port_b: 0, antennas: [] });
@@ -2743,6 +2757,23 @@ export default function App() {
       <Input value={grid} placeholder="JN05" className="font-mono" onChange={(e) => { setGrid(e.target.value); markEdited('grid'); }} />
     </div>
   );
+  // LoTW-user badge: shown only when the entered call is a LoTW user, coloured by
+  // last-upload recency (green < 1 week · amber 1–4 weeks · red > 30 days). The
+  // tooltip shows the exact last-upload date. Needs the list downloaded once
+  // (Settings → LoTW); until then no badge appears.
+  const lotwBlock = (lotwInfo && lotwInfo.is_user) ? (() => {
+    const d = lotwInfo.days_ago ?? -1;
+    const cls = d >= 0 && d < 7 ? 'border-success text-success bg-success/15'
+      : d < 30 ? 'border-warning text-warning bg-warning/15'
+      : 'border-danger text-danger bg-danger/15';
+    return (
+      <div className="self-end shrink-0" title={t('lotw.userTip', { date: lotwInfo.last_upload || '?', days: d })}>
+        <span className={cn('inline-flex items-center rounded-md border px-1.5 py-1.5 text-[10px] font-extrabold tracking-wide leading-none', cls)}>
+          LoTW
+        </span>
+      </div>
+    );
+  })() : null;
   // A discreet spot-alert LED (bell) that fills the gap at the right of the Grid
   // row instead of the intrusive floating cards. It lights + shows a count when
   // alerts are pending; click it to see the last 3 (each clickable to tune).
@@ -3706,6 +3737,7 @@ export default function App() {
               </div>
               {qthBlock}
               {gridBlock}
+              {lotwBlock}
               {alertLedBlock}
             </div>
 

frontend/src/components/SettingsModal.tsx

@@ -37,6 +37,7 @@ import {
   GetExternalServices, SaveExternalServices, TestQRZUpload, TestClublogUpload, TestHRDLogUpload, TestEQSLUpload,
   GetPOTAToken, SavePOTAToken,
   TestLoTWUpload, ListTQSLStationLocations,
+  DownloadLoTWUsers, GetLoTWUsersStatus,
   ComputeStationInfo,
   GetUIPref, SetUIPref,
   GetFlexState, GetFlexBandAntennas, SaveFlexBandAntennas,
@@ -996,6 +997,16 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
   const [clublogTesting, setClublogTesting] = useState(false);
   const [lotwTest, setLotwTest] = useState<{ ok: boolean; msg: string } | null>(null);
   const [lotwTesting, setLotwTesting] = useState(false);
+  // LoTW user-activity list (for the callsign badge): count + last refresh.
+  const [lotwUsers, setLotwUsers] = useState<{ count: number; updated?: string }>({ count: 0 });
+  const [lotwUsersBusy, setLotwUsersBusy] = useState(false);
+  useEffect(() => { GetLoTWUsersStatus().then((s) => setLotwUsers(s as any)).catch(() => {}); }, []);
+  const downloadLotwUsers = async () => {
+    setLotwUsersBusy(true);
+    try { await DownloadLoTWUsers(); const s = await GetLoTWUsersStatus(); setLotwUsers(s as any); }
+    catch (e: any) { setLotwTest({ ok: false, msg: String(e?.message ?? e) }); }
+    finally { setLotwUsersBusy(false); }
+  };
   const [hrdlogTest, setHrdlogTest] = useState<{ ok: boolean; msg: string } | null>(null);
   const [hrdlogTesting, setHrdlogTesting] = useState(false);
   const [eqslTest, setEqslTest] = useState<{ ok: boolean; msg: string } | null>(null);
@@ -3551,6 +3562,23 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
                 )}
               </div>
             </div>
+
+            {/* LoTW user list — powers the colour-coded "LoTW" badge next to the
+                entered callsign (green < 1 week · amber 1–4 weeks · red > 30 days). */}
+            <div className="border-t border-border/60 pt-3 space-y-2">
+              <Label className="text-sm font-medium">{t('lotw.usersTitle')}</Label>
+              <p className="text-[11px] text-muted-foreground">{t('lotw.usersHint')}</p>
+              <div className="flex items-center gap-3">
+                <Button variant="outline" size="sm" onClick={downloadLotwUsers} disabled={lotwUsersBusy}>
+                  <ArrowDown className="size-3.5" /> {lotwUsersBusy ? t('lotw.usersDownloading') : t('lotw.usersDownload')}
+                </Button>
+                <span className="text-xs text-muted-foreground">
+                  {lotwUsers.count > 0
+                    ? t('lotw.usersLoaded', { n: lotwUsers.count.toLocaleString(), date: lotwUsers.updated ? new Date(lotwUsers.updated).toLocaleDateString() : '?' })
+                    : t('lotw.usersNone')}
+                </span>
+              </div>
+            </div>
           </div>
         ) : extSvcTab === 'pota' ? (
           <div className="space-y-4 max-w-2xl">

frontend/src/lib/i18n.tsx

@@ -14,6 +14,7 @@ type Dict = Record<string, string>;
 const en: Dict = {
   // Menu bar
   'prop.title': 'Propagation', 'prop.geomag': 'Geomag', 'prop.refresh': 'Refresh space weather',
+  'lotw.userTip': 'LoTW user — last upload {date} ({days} days ago)',
   'menu.file': 'File', 'menu.edit': 'Edit', 'menu.view': 'View', 'menu.tools': 'Tools',
   'file.import': 'Import ADIF…', 'file.export': 'Export ADIF…', 'file.exporting': 'Exporting…',
   'file.exportCabrillo': 'Export Cabrillo…', 'file.deleteAll': 'Delete all QSOs…', 'file.exit': 'Exit',
@@ -147,6 +148,7 @@ const en: Dict = {
   'cat.ubOk': 'Connected — the Ultrabeam responded with a status frame.',
   // External services (repeated labels)
   'es.autoUpload': 'Automatic upload on new QSO', 'es.uploadTiming': 'Upload timing', 'es.immediate': 'Immediate', 'es.delayed': 'Delayed (1–2 min, lets you fix mistakes)', 'es.onClose': 'On app close (batch)', 'es.testConn': 'Test connection', 'es.testing': 'Testing…', 'es.password': 'Password', 'es.apiKey': 'API key', 'es.forceCall': 'Force station callsign', 'es.accountEmail': 'Account email', 'es.logbookCall': 'Logbook callsign',
+  'lotw.usersTitle': 'LoTW user list', 'lotw.usersHint': "Downloads ARRL's public list of LoTW users + their last-upload date, to show a colour-coded LoTW badge next to a callsign (green < 1 week · amber 1–4 weeks · red > 30 days).", 'lotw.usersDownload': 'Download LoTW user list', 'lotw.usersDownloading': 'Downloading…', 'lotw.usersLoaded': '{n} users loaded · updated {date}', 'lotw.usersNone': 'Not downloaded yet — the badge stays hidden until you do.',
   'hw.connecting': 'Connecting…', 'hw.testConn': 'Test connection', 'hw.sending': 'Sending…', 'hw.testRotator': 'Test (point to 0°)',
   // Profiles panel
   'prof.deleteConfirm': 'Delete profile "{name}"? All its settings will be lost.', 'prof.dupPrompt': 'Name for the new profile (copy of "{name}"):', 'prof.dupSuffix': '{name} Copy', 'prof.newPrompt': 'Name for the new profile:', 'prof.newDefault': 'New profile',
@@ -225,6 +227,7 @@ const en: Dict = {
 
 const fr: Dict = {
   'prop.title': 'Propagation', 'prop.geomag': 'Géomag', 'prop.refresh': 'Actualiser la météo spatiale',
+  'lotw.userTip': 'Utilisateur LoTW — dernier upload {date} (il y a {days} j)',
   'menu.file': 'Fichier', 'menu.edit': 'Édition', 'menu.view': 'Affichage', 'menu.tools': 'Outils',
   'file.import': 'Importer ADIF…', 'file.export': 'Exporter ADIF…', 'file.exporting': 'Export…',
   'file.exportCabrillo': 'Exporter Cabrillo…', 'file.deleteAll': 'Supprimer tous les QSO…', 'file.exit': 'Quitter',
@@ -342,6 +345,7 @@ const fr: Dict = {
   'cat.rotatorOk': "Paquet envoyé — l'antenne devrait tourner vers 0° (nord). Sinon, vérifie l'hôte/port PstRotator et que l'écouteur UDP de PstRotator est activé.",
   'cat.ubOk': "Connecté — l'Ultrabeam a répondu avec une trame de statut.",
   'es.autoUpload': 'Envoi automatique à chaque nouveau QSO', 'es.uploadTiming': "Moment de l'envoi", 'es.immediate': 'Immédiat', 'es.delayed': 'Différé (1–2 min, permet de corriger les erreurs)', 'es.onClose': "À la fermeture (par lot)", 'es.testConn': 'Tester la connexion', 'es.testing': 'Test…', 'es.password': 'Mot de passe', 'es.apiKey': 'Clé API', 'es.forceCall': "Forcer l'indicatif de station", 'es.accountEmail': 'E-mail du compte', 'es.logbookCall': 'Indicatif du carnet',
+  'lotw.usersTitle': 'Liste des utilisateurs LoTW', 'lotw.usersHint': "Télécharge la liste publique ARRL des utilisateurs LoTW + leur date de dernier upload, pour afficher un badge LoTW coloré à côté d'un indicatif (vert < 1 semaine · ambre 1–4 semaines · rouge > 30 j).", 'lotw.usersDownload': 'Télécharger la liste LoTW', 'lotw.usersDownloading': 'Téléchargement…', 'lotw.usersLoaded': '{n} utilisateurs chargés · maj {date}', 'lotw.usersNone': 'Pas encore téléchargée — le badge reste caché tant que ce n’est pas fait.',
   'hw.connecting': 'Connexion…', 'hw.testConn': 'Tester la connexion', 'hw.sending': 'Envoi…', 'hw.testRotator': 'Tester (pointer vers 0°)',
   'prof.deleteConfirm': 'Supprimer le profil « {name} » ? Tous ses réglages seront perdus.', 'prof.dupPrompt': 'Nom du nouveau profil (copie de « {name} ») :', 'prof.dupSuffix': '{name} Copie', 'prof.newPrompt': 'Nom du nouveau profil :', 'prof.newDefault': 'Nouveau profil',
   'prof.hint': "Bascule entre tes identités d'opération (maison / portable / SOTA / contest). Choisis un profil ici, puis édite ses champs dans les autres sections (Informations station, etc.) — les changements sont enregistrés sur le profil sélectionné.", 'prof.active': 'ACTIF', 'prof.duplicate': 'Dupliquer', 'prof.delete': 'Supprimer', 'prof.profileName': 'Nom du profil',

frontend/wailsjs/go/main/App.d.ts

@@ -18,6 +18,7 @@ import {audio} from '../models';
 import {contest} from '../models';
 import {operating} from '../models';
 import {udp} from '../models';
+import {lotwusers} from '../models';
 import {lookup} from '../models';
 import {netctl} from '../models';
 
@@ -139,6 +140,8 @@ export function DownloadClublogCty():Promise<main.ClublogCtyInfo>;
 
 export function DownloadConfirmations(arg1:string,arg2:boolean,arg3:string):Promise<void>;
 
+export function DownloadLoTWUsers():Promise<number>;
+
 export function DuplicateProfile(arg1:number,arg2:string):Promise<profile.Profile>;
 
 export function ExportADIF(arg1:string,arg2:boolean):Promise<adif.ExportResult>;
@@ -319,6 +322,8 @@ export function GetListsSettings():Promise<main.ListsSettings>;
 
 export function GetLiveStatusEnabled():Promise<boolean>;
 
+export function GetLoTWUsersStatus():Promise<main.LoTWUsersStatus>;
+
 export function GetLogFilePath():Promise<string>;
 
 export function GetLogbookRevision():Promise<string>;
@@ -489,6 +494,8 @@ export function ListTQSLStationLocations():Promise<Array<extsvc.StationLocation>
 
 export function ListUDPIntegrations():Promise<Array<udp.Config>>;
 
+export function LoTWUserInfo(arg1:string):Promise<lotwusers.Info>;
+
 export function LogUDPLoggedADIF(arg1:string):Promise<number>;
 
 export function LookupCallsign(arg1:string):Promise<lookup.Result>;

frontend/wailsjs/go/main/App.js

@@ -238,6 +238,10 @@ export function DownloadConfirmations(arg1, arg2, arg3) {
   return window['go']['main']['App']['DownloadConfirmations'](arg1, arg2, arg3);
 }
 
+export function DownloadLoTWUsers() {
+  return window['go']['main']['App']['DownloadLoTWUsers']();
+}
+
 export function DuplicateProfile(arg1, arg2) {
   return window['go']['main']['App']['DuplicateProfile'](arg1, arg2);
 }
@@ -598,6 +602,10 @@ export function GetLiveStatusEnabled() {
   return window['go']['main']['App']['GetLiveStatusEnabled']();
 }
 
+export function GetLoTWUsersStatus() {
+  return window['go']['main']['App']['GetLoTWUsersStatus']();
+}
+
 export function GetLogFilePath() {
   return window['go']['main']['App']['GetLogFilePath']();
 }
@@ -938,6 +946,10 @@ export function ListUDPIntegrations() {
   return window['go']['main']['App']['ListUDPIntegrations']();
 }
 
+export function LoTWUserInfo(arg1) {
+  return window['go']['main']['App']['LoTWUserInfo'](arg1);
+}
+
 export function LogUDPLoggedADIF(arg1) {
   return window['go']['main']['App']['LogUDPLoggedADIF'](arg1);
 }

frontend/wailsjs/go/models.ts

@@ -1154,6 +1154,27 @@ export namespace lookup {
 
 }
 
+export namespace lotwusers {
+	
+	export class Info {
+	    is_user: boolean;
+	    last_upload?: string;
+	    days_ago: number;
+	
+	    static createFrom(source: any = {}) {
+	        return new Info(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.is_user = source["is_user"];
+	        this.last_upload = source["last_upload"];
+	        this.days_ago = source["days_ago"];
+	    }
+	}
+
+}
+
 export namespace main {
 	
 	export class AntGeniusSettings {
@@ -1738,6 +1759,20 @@ export namespace main {
 		    return a;
 		}
 	}
+	export class LoTWUsersStatus {
+	    count: number;
+	    updated?: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new LoTWUsersStatus(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.count = source["count"];
+	        this.updated = source["updated"];
+	    }
+	}
 	export class LookupSettings {
 	    qrz_user: string;
 	    qrz_password: string;

internal/clublog/clublog.go

@@ -202,6 +202,23 @@ func (db *DB) Resolve(call string, date time.Time) (Exception, bool) {
 	return Exception{}, false
 }
 
+// HasException reports whether the callsign has ANY full-call exception (at any
+// date). Used to tell a genuinely date-sensitive call (G1T: Scotland only from
+// 2024) — where cty.dat's date-blind exact-call override is wrong for older
+// QSOs — from an ordinary call cty.dat handles fine.
+func (db *DB) HasException(call string) bool {
+	if db == nil {
+		return false
+	}
+	c := strings.ToUpper(strings.TrimSpace(call))
+	for _, key := range candidates(c) {
+		if len(db.exceptions[key]) > 0 {
+			return true
+		}
+	}
+	return false
+}
+
 // candidates yields the call and a version with one trailing affix removed.
 func candidates(c string) []string {
 	out := []string{c}

internal/clublog/clublog_test.go

@@ -0,0 +1,50 @@
+package clublog
+
+import (
+	"testing"
+	"time"
+)
+
+func d(s string) time.Time {
+	t, _ := time.Parse("2006-01-02", s)
+	return t
+}
+
+// G1T is a contest call: Scotland ONLY from 2024-02-21; before that it's England
+// by prefix. cty.dat's date-blind "=G1T → Scotland" override is wrong for a 2012
+// QSO — the date-aware ClubLog cascade must give England then, Scotland now.
+func TestG1TDatedException(t *testing.T) {
+	db := &DB{
+		exceptions: map[string][]Exception{
+			"G1T": {{Call: "G1T", Entity: "Scotland", ADIF: 279, Start: d("2024-02-21")}},
+		},
+		prefixes: map[string][]Exception{
+			"G": {{Entity: "England", ADIF: 223}},
+		},
+	}
+
+	// 2012 QSO: exception doesn't cover it, but the call HAS an exception →
+	// caller should use the prefix (England).
+	if _, ok := db.Resolve("G1T", d("2012-07-29")); ok {
+		t.Fatalf("2012: exception should NOT cover a pre-2024 date")
+	}
+	if !db.HasException("G1T") {
+		t.Fatalf("HasException(G1T) should be true")
+	}
+	pe, pok := db.ResolvePrefix("G1T", d("2012-07-29"))
+	if !pok || pe.Entity != "England" {
+		t.Fatalf("2012 prefix: got %q ok=%v, want England", pe.Entity, pok)
+	}
+
+	// 2025 QSO: the exception covers it → Scotland.
+	e, ok := db.Resolve("G1T", d("2025-01-01"))
+	if !ok || e.Entity != "Scotland" {
+		t.Fatalf("2025: got %q ok=%v, want Scotland", e.Entity, ok)
+	}
+
+	// An ordinary call with no exception → HasException false (caller leaves it
+	// to cty.dat).
+	if db.HasException("G4ABC") {
+		t.Fatalf("HasException(G4ABC) should be false")
+	}
+}

internal/clublog/manager.go

@@ -125,3 +125,19 @@ func (m *Manager) Resolve(call string, date time.Time) (Exception, bool) {
 	}
 	return db.Resolve(call, date)
 }
+
+// ResolvePrefix resolves a call by ClubLog's date-ranged PREFIX table.
+func (m *Manager) ResolvePrefix(call string, date time.Time) (Exception, bool) {
+	m.mu.RLock()
+	db := m.db
+	m.mu.RUnlock()
+	return db.ResolvePrefix(call, date)
+}
+
+// HasException reports whether the call has any full-call exception (any date).
+func (m *Manager) HasException(call string) bool {
+	m.mu.RLock()
+	db := m.db
+	m.mu.RUnlock()
+	return db.HasException(call)
+}

internal/dxcc/dxcc.go

@@ -339,17 +339,25 @@ func normalizeCallsign(s string) string {
 	// which can change the DXCC entity (HD5MW/8 → HD8MW → Galápagos, not
 	// Ecuador). This is the same class of rule as KG4 and /MM.
 	if areaDigit != 0 {
-		main = replaceFirstDigit(main, areaDigit)
+		main = replaceAreaDigit(main, areaDigit)
 	}
 	return main
 }
 
-// replaceFirstDigit substitutes the first 0-9 digit of a call with d (used to
+// replaceAreaDigit substitutes the CALL-AREA digit of a call with d (used to
-// apply a "/N" call-area change). Returns the call unchanged if it has no digit.
+// apply a "/N" call-area change). The area digit is the first digit that comes
-func replaceFirstDigit(call string, d byte) string {
+// AFTER a prefix letter — NOT a leading digit that is part of a digit-first
+// prefix (7X, 3A, 4X, 9A, 2E…). So 7X2ARA/4 → 7X4ARA (still Algeria, area 4),
+// NOT 4X2ARA (which is Israel — the old first-digit bug). Returns the call
+// unchanged if it has no such digit.
+func replaceAreaDigit(call string, d byte) string {
 	b := []byte(call)
+	seenLetter := false
 	for i := range b {
-		if b[i] >= '0' && b[i] <= '9' {
+		switch {
+		case b[i] >= 'A' && b[i] <= 'Z':
+			seenLetter = true
+		case b[i] >= '0' && b[i] <= '9' && seenLetter:
 			b[i] = d
 			return string(b)
 		}

internal/dxcc/dxcc_test.go

@@ -219,6 +219,9 @@ func TestNormalize(t *testing.T) {
 		"F4BPO/M":    "F4BPO", // plain mobile keeps the home entity
 		"F4BPO/5":    "F5BPO", // "/5" re-homes to call area 5
 		"HD5MW/8":    "HD8MW", // "/8" → Galápagos call area (HD8)
+		"7X2ARA/4":   "7X4ARA", // "/4" changes the AREA digit (2→4), NOT the 7 of the 7X prefix (was wrongly 4X2ARA = Israel)
+		"3A2ABC/6":   "3A6ABC", // digit-first prefix 3A: area digit is the 2, not the 3
+		"4X1AB/2":    "4X2AB",  // 4X (Israel) area 1→2, keep the leading 4
 		"DL/F4BPO":   "DL",
 		"MM/KA9P":    "MM",    // leading MM = Scotland operating prefix
 		"MM/LY3X/P":  "MM",

internal/lotwusers/lotwusers.go

@@ -0,0 +1,178 @@
+// Package lotwusers tracks which callsigns are LoTW users and when they last
+// uploaded, from ARRL's public "lotw-user-activity.csv" feed. OpsLog shows a
+// colour-coded badge next to the entered callsign (recent upload = likely to
+// confirm on LoTW). The list is cached on disk so it survives restarts.
+package lotwusers
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+)
+
+// feedURL is ARRL's public LoTW last-upload activity list (CSV:
+// "CALLSIGN,YYYY-MM-DD,HH:MM:SS", one line per registered LoTW callsign).
+const feedURL = "https://lotw.arrl.org/lotw-user-activity.csv"
+
+const cacheFile = "lotw-user-activity.csv"
+
+// Info is a lookup result for one callsign.
+type Info struct {
+	IsUser     bool   `json:"is_user"`
+	LastUpload string `json:"last_upload,omitempty"` // YYYY-MM-DD
+	DaysAgo    int    `json:"days_ago"`              // days since last upload (-1 if unknown)
+}
+
+// Manager holds the parsed list + cache location.
+type Manager struct {
+	mu      sync.RWMutex
+	users   map[string]time.Time // UPPER(callsign) → last-upload date (UTC)
+	updated time.Time            // when the cache was last refreshed
+	dir     string
+	client  *http.Client
+}
+
+// NewManager loads any on-disk cache and returns a ready manager.
+func NewManager(dataDir string) *Manager {
+	m := &Manager{
+		users:  map[string]time.Time{},
+		dir:    dataDir,
+		client: &http.Client{Timeout: 90 * time.Second},
+	}
+	m.loadCache()
+	return m
+}
+
+func (m *Manager) path() string { return filepath.Join(m.dir, cacheFile) }
+
+func (m *Manager) loadCache() {
+	data, err := os.ReadFile(m.path())
+	if err != nil {
+		return
+	}
+	m.parse(data)
+	if fi, e := os.Stat(m.path()); e == nil {
+		m.mu.Lock()
+		m.updated = fi.ModTime()
+		m.mu.Unlock()
+	}
+}
+
+// Download fetches the latest list, caches it to disk and replaces the in-memory
+// map. Returns the number of callsigns loaded.
+func (m *Manager) Download(ctx context.Context) (int, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, feedURL, nil)
+	if err != nil {
+		return 0, err
+	}
+	req.Header.Set("User-Agent", "OpsLog")
+	resp, err := m.client.Do(req)
+	if err != nil {
+		return 0, fmt.Errorf("lotwusers: request failed: %w", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return 0, fmt.Errorf("lotwusers: http %d", resp.StatusCode)
+	}
+	body, err := io.ReadAll(io.LimitReader(resp.Body, 64*1024*1024))
+	if err != nil {
+		return 0, fmt.Errorf("lotwusers: read: %w", err)
+	}
+	n := m.parse(body)
+	if n == 0 {
+		return 0, fmt.Errorf("lotwusers: feed parsed to 0 callsigns")
+	}
+	_ = os.WriteFile(m.path(), body, 0o644) // best-effort cache
+	m.mu.Lock()
+	m.updated = time.Now()
+	m.mu.Unlock()
+	return n, nil
+}
+
+// parse loads the CSV bytes into the map and returns the count.
+func (m *Manager) parse(data []byte) int {
+	users := make(map[string]time.Time, 1<<20)
+	sc := bufio.NewScanner(bytes.NewReader(data))
+	sc.Buffer(make([]byte, 1024*1024), 1024*1024)
+	for sc.Scan() {
+		line := strings.TrimSpace(sc.Text())
+		if line == "" {
+			continue
+		}
+		parts := strings.Split(line, ",")
+		if len(parts) < 2 {
+			continue
+		}
+		call := strings.ToUpper(strings.TrimSpace(parts[0]))
+		if call == "" || strings.EqualFold(call, "callsign") {
+			continue // header row
+		}
+		t, err := time.Parse("2006-01-02", strings.TrimSpace(parts[1]))
+		if err != nil {
+			continue
+		}
+		users[call] = t
+	}
+	if len(users) == 0 {
+		return 0
+	}
+	m.mu.Lock()
+	m.users = users
+	m.mu.Unlock()
+	return len(users)
+}
+
+// Lookup reports whether callsign is a LoTW user and how long ago it uploaded.
+// Tries the exact call, then (for portable calls like "EA8/DL1ABC" or "F5ABC/P")
+// the longest slash-separated segment — the base call LoTW is keyed on.
+func (m *Manager) Lookup(callsign string) Info {
+	c := strings.ToUpper(strings.TrimSpace(callsign))
+	if c == "" {
+		return Info{DaysAgo: -1}
+	}
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	if len(m.users) == 0 {
+		return Info{DaysAgo: -1}
+	}
+	t, ok := m.users[c]
+	if !ok && strings.Contains(c, "/") {
+		base := ""
+		for _, seg := range strings.Split(c, "/") {
+			if len(seg) > len(base) {
+				base = seg
+			}
+		}
+		t, ok = m.users[base]
+	}
+	if !ok {
+		return Info{DaysAgo: -1}
+	}
+	days := int(time.Since(t).Hours() / 24)
+	if days < 0 {
+		days = 0
+	}
+	return Info{IsUser: true, LastUpload: t.Format("2006-01-02"), DaysAgo: days}
+}
+
+// Count returns how many callsigns are loaded.
+func (m *Manager) Count() int {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	return len(m.users)
+}
+
+// Updated returns when the list was last refreshed (zero if never).
+func (m *Manager) Updated() time.Time {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	return m.updated
+}