fix: bug sending LoTW on close

internal/extsvc/extsvc.go

@@ -69,7 +69,7 @@ type ServiceConfig struct {
 	TQSLPath             string     `json:"tqsl_path"`              // LoTW: path to tqsl.exe
 	StationLocation      string     `json:"station_location"`       // LoTW: TQSL Station Location name
 	KeyPassword          string     `json:"key_password"`           // LoTW: certificate private-key password (optional)
-	UploadFlag           string     `json:"upload_flag"`            // LoTW: sent status that means "ready to upload" — "N" or "R"
+	UploadFlags          []string   `json:"upload_flags"`           // LoTW: set of lotw_sent values that mean "ready to upload" — any of "N"/"R"
 	WriteLog             bool       `json:"write_log"`              // LoTW: pass -t to write a TQSL diagnostic log
 	AutoUpload           bool       `json:"auto_upload"`
 	UploadMode           UploadMode `json:"upload_mode"`
@@ -84,13 +84,19 @@ func (c ServiceConfig) normalised() ServiceConfig {
 	c.ForceStationCallsign = strings.ToUpper(strings.TrimSpace(c.ForceStationCallsign))
 	c.TQSLPath = strings.TrimSpace(c.TQSLPath)
 	c.StationLocation = strings.TrimSpace(c.StationLocation)
-	// Upload flag is the LoTW sent-status that marks a QSO ready to upload.
-	// Only "N" (no) and "R" (requested) are valid; default to "R".
-	if uf := strings.ToUpper(strings.TrimSpace(c.UploadFlag)); uf == "N" || uf == "R" {
-		c.UploadFlag = uf
-	} else {
-		c.UploadFlag = "R"
+	// Upload flags are the LoTW sent-statuses that mark a QSO ready to upload.
+	// Only "N" (no) and "R" (requested) are valid; clean + dedupe, no default
+	// here (the caller injects N+R when nothing is configured).
+	var flags []string
+	seen := map[string]bool{}
+	for _, f := range c.UploadFlags {
+		f = strings.ToUpper(strings.TrimSpace(f))
+		if (f == "N" || f == "R") && !seen[f] {
+			seen[f] = true
+			flags = append(flags, f)
+		}
 	}
+	c.UploadFlags = flags
 	switch c.UploadMode {
 	case ModeDelayed, ModeOnClose:
 		// keep