优化订单结算金额展示和钱包流水号

backend/internal/modules/wallet/repository.go

@@ -2,7 +2,6 @@ package wallet
 
 import (
 	"crypto/rand"
-	"encoding/hex"
 	"fmt"
 	"math"
 	"time"
@@ -290,9 +289,13 @@ func toLedgerDTO(row model.WalletLedger) LedgerDTO {
 }
 
 func newLedgerNo() (string, error) {
-	buf := make([]byte, 4)
+	// 生成格式：WL + YYYYMMDDHHMMSS + 毫秒 + 4位随机数
+	// 例如：WL202606051234561230456，便于用户和客服识别。
+	now := time.Now()
+	buf := make([]byte, 2)
 	if _, err := rand.Read(buf); err != nil {
 		return "", err
 	}
-	return fmt.Sprintf("WL%d%s", time.Now().UnixNano(), hex.EncodeToString(buf)), nil
+	randomNum := (int(buf[0])<<8 | int(buf[1])) % 10000
+	return fmt.Sprintf("WL%s%03d%04d", now.Format("20060102150405"), now.Nanosecond()/1_000_000, randomNum), nil
 }

backend/internal/modules/wallet/repository_test.go

@@ -1,6 +1,7 @@
 package wallet
 
 import (
+	"regexp"
 	"testing"
 
 	"hfb_sys/backend/internal/model"
@@ -29,3 +30,14 @@ func TestApplyEntryRoundsMoneyBeforeComparing(t *testing.T) {
 		t.Fatalf("FrozenBalance = %v, want 0", account.FrozenBalance)
 	}
 }
+
+func TestNewLedgerNoUsesReadableFormat(t *testing.T) {
+	ledgerNo, err := newLedgerNo()
+	if err != nil {
+		t.Fatalf("newLedgerNo() error = %v", err)
+	}
+	matched := regexp.MustCompile(`^WL\d{21}$`).MatchString(ledgerNo)
+	if !matched {
+		t.Fatalf("ledgerNo = %q, want WL + 21 digits", ledgerNo)
+	}
+}