feat(v2): crypto 孤儿到账发现——OrphanScanner 扫链核对 + orphan_payments 落表告警(对账兜底)

internal/store/orphan.go

@@ -0,0 +1,26 @@
+package store
+
+import (
+	"fmt"
+
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+
+	"github.com/wangjia/pay/internal/model"
+)
+
+type OrphanStore struct{ db *gorm.DB }
+
+func NewOrphanStore(db *gorm.DB) *OrphanStore { return &OrphanStore{db: db} }
+
+// Record 幂等落一条孤儿(tx_id 冲突 no-op)。返回是否新记(供告警只喊一次)。
+func (s *OrphanStore) Record(o *model.OrphanPayment) (bool, error) {
+	res := s.db.Clauses(clause.OnConflict{
+		Columns:   []clause.Column{{Name: "tx_id"}},
+		DoNothing: true,
+	}).Create(o)
+	if res.Error != nil {
+		return false, fmt.Errorf("store.OrphanStore.Record: %w", res.Error)
+	}
+	return res.RowsAffected > 0, nil
+}