Steps to produce:
---
- Install sale_tiktok module.
- Create two active tiktok.shop records.
- Run the database neutralization command.

Issue:
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- Neutralization fails with a PostgreSQL error:
 ```py
 duplicate key value violates unique constraint tiktok_shop_unique_active_shop`
 DETAIL: Key (tiktok_shop_ref)=(1) already exists.
```

Root cause:
---
- At [1], we are setting `tiktok_shop_ref = 1` for all `tiktok_shop` records. Because `tiktok_shop` enforces a partial unique constraint on `tiktok_shop_ref` for active shops [2], setting the same reference value `1` on multiple active shops violates this constraint.

Solution:
---
- Update sql to assign a row-unique string to each shop. This strips the real shop reference while maintaining uniqueness across active shop records so neutralization completes cleanly.

[1]https://github.com/odoo/enterprise/blob/85754b0354b76da8b4d87a3a81dd19679ed35d15/sale_tiktok/data/neutralize.sql#L1-L8

[2]https://github.com/odoo/enterprise/blob/85754b0354b76da8b4d87a3a81dd19679ed35d15/sale_tiktok/models/tiktok_shop.py#L136-L139

opw-6451715
---