fix: UDP-logged QSOs fall back to the offline outbox on DB failure (were silently lost); speed up MySQL connect (batch migration checks into 1 query, connect direct-to-DB first) — was ~40s on a high-latency link

app.go

@@ -9623,6 +9623,14 @@ func (a *App) LogUDPLoggedADIF(adifText string) (int64, error) {
 
 	id, err := a.qso.Add(a.ctx, q)
 	if err != nil {
+		// DB UNREACHABLE (drop / timeout on a slow-or-broken MySQL) — park the QSO
+		// in the offline outbox rather than lose it, exactly like the manual log
+		// path. Without this, a laggy shared MySQL silently dropped UDP-logged QSOs
+		// from a multi-stream MSHV. Returns -1 so the caller treats it as "saved,
+		// waiting to sync", not a failure.
+		if db.IsConnLost(err) && a.queueOffline(q, err) {
+			return -1, nil
+		}
 		return 0, fmt.Errorf("insert qso: %w", err)
 	}
 	q.ID = id
@@ -9633,6 +9641,10 @@ func (a *App) LogUDPLoggedADIF(adifText string) (int64, error) {
 		a.extsvc.OnQSOLogged(id)
 	}
 	a.maybeAutoSendEQSL(q)
+	// A successful write means the link is healthy again — flush anything parked.
+	if a.offlineMode && a.offlineQ != nil && a.offlineQ.Count() > 0 {
+		go func() { _, _ = a.replayOfflineQueue() }()
+	}
 	return id, nil
 }