fixes

apps/api/internal/eprel/id.go

@@ -16,32 +16,34 @@ var eprelIDKeys = []string{
 }
 
 // NormalizeID coerces XML/API values (string, number, {"#text": ...}) to a trimmed ID.
+// Placeholder feed values like "0" / "0000" become empty so the EPREL step is not
+// falsely "skipped" after a doomed fetch attempt.
 func NormalizeID(v any) string {
 	if v == nil {
 		return ""
 	}
+	var s string
 	switch t := v.(type) {
 	case string:
-		return strings.TrimSpace(t)
+		s = strings.TrimSpace(t)
 	case json.Number:
-		s := strings.TrimSpace(t.String())
+		s = strings.TrimSpace(t.String())
 		if i := strings.IndexByte(s, '.'); i >= 0 {
 			s = s[:i]
 		}
-		return s
 	case float64:
 		if t != t { // NaN
 			return ""
 		}
-		return strconv.FormatInt(int64(t), 10)
+		s = strconv.FormatInt(int64(t), 10)
 	case float32:
-		return strconv.FormatInt(int64(t), 10)
+		s = strconv.FormatInt(int64(t), 10)
 	case int:
-		return strconv.Itoa(t)
+		s = strconv.Itoa(t)
 	case int64:
-		return strconv.FormatInt(t, 10)
+		s = strconv.FormatInt(t, 10)
 	case int32:
-		return strconv.FormatInt(int64(t), 10)
+		s = strconv.FormatInt(int64(t), 10)
 	case json.RawMessage:
 		var decoded any
 		if err := json.Unmarshal(t, &decoded); err != nil {
@@ -55,14 +57,44 @@ func NormalizeID(v any) string {
 		if text, ok := t["text"]; ok {
 			return NormalizeID(text)
 		}
+		return ""
+	case []any:
+		for _, item := range t {
+			if id := NormalizeID(item); id != "" {
+				return id
+			}
+		}
+		return ""
+	case []string:
+		for _, item := range t {
+			if id := NormalizeID(item); id != "" {
+				return id
+			}
+		}
+		return ""
 	default:
-		s := strings.TrimSpace(fmt.Sprint(t))
+		s = strings.TrimSpace(fmt.Sprint(t))
 		if s == "" || s == "<nil>" {
 			return ""
 		}
-		return s
 	}
-	return ""
+	if isPlaceholderEPRELID(s) {
+		return ""
+	}
+	return s
+}
+
+func isPlaceholderEPRELID(id string) bool {
+	id = strings.TrimSpace(id)
+	if id == "" {
+		return true
+	}
+	for _, r := range id {
+		if r != '0' {
+			return false
+		}
+	}
+	return true
 }
 
 // IsValidID reports whether v normalizes to a non-empty EPREL registration id.
@@ -70,8 +102,8 @@ func IsValidID(v any) bool {
 	return NormalizeID(v) != ""
 }
 
-// ExtractID finds an EPREL ID in mapped and/or raw product field maps
-// (vendor feeds often use <EPRELID/> / eprel_id).
+// ExtractID finds an EPREL ID in mapped, raw, and/or attribute field maps
+// (vendor feeds often use <EPRELID/> / eprel_id; specs parse may put it only in attrs).
 func ExtractID(sources ...map[string]any) string {
 	for _, src := range sources {
 		if src == nil {