refine the system history tables (#2349)

* refine the system history tables

* Update index.md

Author: BohuTANG

docs/en/sql-reference/00-sql-reference/31-system-history-tables/index.md

@@ -0,0 +1,55 @@
+---
+title: System History Tables
+---
+
+# System History Tables
+
+System history tables store persistent data in the `system_history` schema for auditing, troubleshooting, and compliance purposes. They track query execution, user logins, and system logs that can be queried using standard SQL.
+
+## Available System History Tables
+
+| Table                                               | Description                                                     |
+|-----------------------------------------------------|-----------------------------------------------------------------|
+| [system_history.log_history](log-history.md)        | Stores raw log entries from various system components.          |
+| [system_history.query_history](query-history.md)    | Stores structured details of query execution.                   |
+| [system_history.profile_history](profile-history.md)| Stores detailed query execution profiles and statistics.        |
+| [system_history.login_history](login-history.md)    | Records information about user login events.                    |
+
+## Enabling System History Tables
+
+> **Note:** In **Databend Cloud**, system history tables are automatically enabled and ready to use without any configuration needed. The following section applies only to **self-hosted Databend**.
+
+In self-hosted Databend, system history tables are disabled by default. To enable them, configure the `[log.history]` section in your `databend-query.toml` file.
+
+<details>
+<summary>Configuration Example</summary>
+
+```toml
+[log.history]
+# Enable history tables
+on = true
+level = "INFO"
+
+# Configure retention policies for each table
+[[log.history.tables]]
+table_name = "log_history"
+retention = 168  # 7 days (in hours)
+
+[[log.history.tables]]
+table_name = "query_history"
+retention = 168
+
+[[log.history.tables]]
+table_name = "profile_history"
+retention = 168
+
+[[log.history.tables]]
+table_name = "login_history"
+retention = 168
+```
+
+> **Note:** The `log_history` table is enabled by default when history logging is turned on.
+
+</details>
+
+For more details about configuration options, see [Query Configuration: [log.history] Section](/guides/deploy/references/node-config/query-config#loghistory-section).