合并外部维护版本并同步自动每日功能

app/redemption_codes.py

@@ -208,6 +208,30 @@ class RedemptionCodeStore:
         if starts_utc >= ends_utc:
             raise ValueError("失效时间必须晚于生效时间")
         now = utc_now()
+        # 同名的"已停用/已删除且从未兑换"旧码会让 UNIQUE 约束挡住重建，
+        # 直接在旧记录上复用（更新内容并重新启用），历史 id 保持连续。
+        stale = connection.execute(
+            """SELECT id FROM redemption_codes
+               WHERE code_normalized = ? AND redeemed_count = 0
+                 AND (deleted_at_utc IS NOT NULL OR enabled = 0)""",
+            (normalized,),
+        ).fetchone()
+        if stale is not None:
+            connection.execute(
+                """UPDATE redemption_codes SET
+                       code_display = ?, points = ?, starts_at_utc = ?, ends_at_utc = ?,
+                       max_redemptions = ?, enabled = ?, deleted_at_utc = NULL,
+                       updated_at_utc = ?
+                   WHERE id = ?""",
+                (display, points, starts_utc, ends_utc, max_value,
+                 int(bool(enabled)), now, stale["id"]),
+            )
+            connection.commit()
+            row = connection.execute(
+                "SELECT * FROM redemption_codes WHERE id=?", (stale["id"],)
+            ).fetchone()
+            assert row is not None
+            return self._serialize_code(row)
         try:
             cursor = connection.execute(
                 """INSERT INTO redemption_codes (