diag: log slow QSO inserts (>2s) with call/band/mode; rotate the app log to .1 at 10MB instead of deleting it, so the previous session's diagnostics survive

app.go

@@ -1934,7 +1934,13 @@ func (a *App) AddQSO(q qso.QSO) (id int64, err error) {
 	// was redundant with the entry lookup and only slowed logging (a call not yet in
 	// the cache made AddQSO wait on QRZ/HamQTH). If the entry lookup hadn't finished
 	// when you logged (fast CW: type → Enter), the e-mail is simply blank — fine.
+	insT0 := time.Now()
 	id, err = a.qso.Add(a.ctx, q)
+	if d := time.Since(insT0); d > 2*time.Second {
+		// Surface a genuinely slow INSERT (DB lock / overloaded server) — this is the
+		// value we need when someone reports "logging took N seconds".
+		applog.Printf("log: SLOW qso insert took %s (call=%s band=%s mode=%s)", d.Round(time.Millisecond), q.Callsign, q.Band, q.Mode)
+	}
 	if err != nil && db.IsConnLost(err) {
 		// The database is UNREACHABLE (not a data error) — park the QSO in the
 		// offline outbox rather than lose it. Returns id = -1 so the UI can say