Remove outdated "primary key" guidance

README.md

@@ -1,8 +1,8 @@
 # cbdb_sqlite
 
-[**latest.7z**](https://github.com/cbdb-project/cbdb_sqlite/blob/master/latest.7z) - The latest SQLite version of the [China Biographical Database](https://projects.iq.harvard.edu/cbdb/home). This version includes no indexes or primary keys.
+[**latest.7z**](https://github.com/cbdb-project/cbdb_sqlite/blob/master/latest.7z) - The latest SQLite version of the [China Biographical Database](https://projects.iq.harvard.edu/cbdb/home).
 
-You can also download it from huggingface (includes indexes and primary keys):
+You can also download it from huggingface:
 
 https://huggingface.co/datasets/cbdb/cbdb-sqlite/blob/main/latest.7z
 
@@ -14,4 +14,3 @@ https://huggingface.co/datasets/cbdb/cbdb-sqlite/resolve/main/latest.7z?download
 
 You can download the history SQLite databases from the [CBDB Hugging Face account](https://huggingface.co/datasets/cbdb/cbdb-sqlite/tree/main/history)
 
-

USAGE.md

@@ -41,14 +41,6 @@ Use tools such as `pyenv` if you need to maintain multiple Python versions and c
    rm latest.7z
    ```
 
-## Primary Keys
-To keep the archive small, the `latest.7z` published by the cbdb_sqlite project does not include primary keys, indexes, or views. Add them as needed for your use cases.
-
-To add primary keys, run the `scripts/add_primary_keys.py` helper:
-```bash
-python3 scripts/add_primary_keys.py --db CBDB_20250520.db
-```
-
 ## Query Examples
 
 Use the interactive `sqlite3` shell for quick data inspection:

USAGE.zh.md

@@ -43,15 +43,6 @@
   rm latest.7z
   ```
 
-## 主键
-为节省数据集体积， cbdb_sqlite 项目中发布的 latest.7z 不包含主键、索引、视图。用户可根据使用需求添加。
-
-如需要主键，可运行 `scripts/add_primary_keys.py` 脚本添加主键如下：
-
-  ```bash
-  python3 scripts/add_primary_keys.py --db CBDB_20250520.db
-  ```
-
 ## 常见查询示例
 
 使用 `sqlite3` 交互模式快速检查数据：

scripts/README.md

@@ -7,7 +7,6 @@ This directory contains the helper scripts used to download, normalise, and comp
 ## Available Scripts
 
 - `process_cbdb_dbs.sh`: end-to-end workflow that downloads the latest and historical SQLite dumps, unpacks them, applies the normalisation helpers, vacuums the databases, and generates a schema/data summary comparison.
-- `add_primary_keys.py`: rebuilds tables that lack explicit primary keys by creating replacement tables with the desired constraints and copying data across inside a single transaction.
 - `compare_db_tables.py`: compares two SQLite databases table-by-table, emitting a report of schema and data discrepancies.
 
 ## Prerequisites

scripts/README.zh.md

@@ -5,7 +5,6 @@
 ## 脚本一览
 
 - `process_cbdb_dbs.sh`：完整流程脚本，负责下载最新与历史版 SQLite 数据库、解压、运行规范化工具、执行 `VACUUM`，并生成数据库差异报告。
-- `add_primary_keys.py`：为缺少显式主键的表重建结构，在单个事务内创建带主键的新表并复制数据。
 - `compare_db_tables.py`：逐表对比两个 SQLite 数据库的结构与数据，输出差异摘要。
 
 ## 运行前提