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update release history timecho 2081 (#1010)
* update release history timecho 2081 * adjust content
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‎src/UserGuide/Master/Table/IoTDB-Introduction/Release-history_timecho.md‎

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## 1. TimechoDB (Database Core)
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### V2.0.8.1
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> Release Date: 2026.02.04</br>
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> Download Link: Please contact Timecho Team to obtain the download link</br>
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> Package Name:timechodb-2.0.8.1-bin.zip</br>
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> SHA512 Checksum: 49d97cbf488443f8e8e73cc39f6f320b3bc84b194aed90af695ebd5771650b5e5b6a3abb0fb68059bd01827260485b903c035657b337442f4fdd32c877f2aca3
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V2.0.8.1 introduces the **Object data type** to table models, significantly enhances audit logging capabilities, optimizes the tree model’s **OPC UA protocol**, adds **covariate-based forecasting** support in AINode, and enables **concurrent inference** in AINode. Additionally, comprehensive improvements have been made to database monitoring, performance, and stability. The detailed release notes are as follows:
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- **Query Module**: Added a list view of available DataNode instances, allowing users to [view each node's RPC address and port](../User-Manual/Maintenance-commands_timecho.md#_1-7-viewing-available-nodes).
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- **Query Module**: Introduced a new system table for [statistical query latency analysis](../Reference/System-Tables_timecho.md#_2-20-queries-costs-histogram).
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- **Storage Module**: Added SQL support to retrieve the full definition statements for [tables](../Basic-Concept/Table-Management_timecho.md#_1-4-view-table-creation-statement) and [views](../User-Manual/Tree-to-Table_timecho.md#_2-4-viewing-table-views).
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- **Storage Module**: Optimized the tree model’s [OPC UA protocol](../../latest/API/Programming-OPC-UA_timecho.md).
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- **System Module**: Added support for the [Object data type](../Background-knowledge/Data-Type_timecho.md) in table models.
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- **System Module**: Significantly enhanced and upgraded the [audit log](../User-Manual/Audit-Log_timecho.md) functionality.
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- **System Module**: Added a new system table to monitor [DataNode connection status](../Reference/System-Tables_timecho.md#_2-18-connections).
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- **AINode**: Integrated the built-in **Chronos-2** model, supporting [covariate-based forecasting](../AI-capability/AINode_Upgrade_timecho.md).
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- **AINode**: Built-in models **Timer-XL** and **Sundial** now support [concurrent inference](../AI-capability/AINode_Upgrade_timecho.md).
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- **Stream Processing Module**: When creating a full-data synchronization pipe, it will be [automatically split](../User-Manual/Data-Sync_timecho.md#_2-1-create-a-task) into two independent pipes—one for real-time data and one for historical data—whose remaining event counts can be monitored separately via the `SHOW PIPES` statement.
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- **Others**: Fixed security vulnerabilities **CVE-2025-12183**, **CVE-2025-66566**, and **CVE-2025-11226**.
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### V2.0.6.6
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> Release Date: 2026.01.20</br>

‎src/UserGuide/Master/Tree/IoTDB-Introduction/Release-history_timecho.md‎

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## 1. TimechoDB (Database Core)
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### V2.0.8.1
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> Release Date: 2026.02.04</br>
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> Download Link: Please contact Timecho Team to obtain the download link</br>
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> Package Name:timechodb-2.0.8.1-bin.zip</br>
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> SHA512 Checksum: 49d97cbf488443f8e8e73cc39f6f320b3bc84b194aed90af695ebd5771650b5e5b6a3abb0fb68059bd01827260485b903c035657b337442f4fdd32c877f2aca3
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V2.0.8.1 introduces the **Object data type** to table models, significantly enhances audit logging capabilities, optimizes the tree model’s **OPC UA protocol**, adds **covariate-based forecasting** support in AINode, and enables **concurrent inference** in AINode. Additionally, comprehensive improvements have been made to database monitoring, performance, and stability. The detailed release notes are as follows:
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- **Query Module**: Added a list view of available DataNode instances, allowing users to [view each node's RPC address and port](../User-Manual/Maintenance-commands_timecho.md#_1-7-viewing-available-nodes).
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- **Query Module**: Introduced a new system table for [statistical query latency analysis](../../latest-Table/Reference/System-Tables_timecho.md#_2-20-queries-costs-histogram).
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- **Storage Module**: Added SQL support to retrieve the full definition statements for [tables](../../latest-Table/Basic-Concept/Table-Management_timecho.md#_1-4-view-table-creation-statement) and [views](../../latest-Table/User-Manual/Tree-to-Table_timecho.md#_2-4-viewing-table-views).
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- **Storage Module**: Optimized the tree model’s [OPC UA protocol](../API/Programming-OPC-UA_timecho.md).
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- **System Module**: Added support for the [Object data type](../../latest-Table/Background-knowledge/Data-Type_timecho.md) in table models.
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- **System Module**: Significantly enhanced and upgraded the [audit log](../User-Manual/Audit-Log_timecho.md) functionality.
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- **System Module**: Added a new system table to monitor [DataNode connection status](../../latest-Table/Reference/System-Tables_timecho.md#_2-18-connections).
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- **AINode**: Integrated the built-in **Chronos-2** model, supporting [covariate-based forecasting](../../latest-Table/AI-capability/AINode_Upgrade_timecho.md).
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- **AINode**: Built-in models **Timer-XL** and **Sundial** now support [concurrent inference](../../latest-Table/AI-capability/AINode_Upgrade_timecho.md).
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- **Stream Processing Module**: When creating a full-data synchronization pipe, it will be [automatically split](../User-Manual/Data-Sync_timecho.md#_2-1-create-a-task) into two independent pipes—one for real-time data and one for historical data—whose remaining event counts can be monitored separately via the `SHOW PIPES` statement.
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- **Others**: Fixed security vulnerabilities **CVE-2025-12183**, **CVE-2025-66566**, and **CVE-2025-11226**.
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### V2.0.6.6
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> Package Name: timechodb-2.0.6.6-bin.zip</br>
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> SHA512 Checksum: d12e60b8119690d63c501d0c2afcd527e39df8a8786198e35b53338e21939e1a9244805e710d81cbb62d02c2739909d7e8227c029660a0cd9ea7ca718cf9bdf6
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V2.0.6.6 primarily optimizes query performance for time series in the tree model, while delivering comprehensive improvements in database monitoring, performance, and stability. Specific release contents are as follows:
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V2.0.6.6 primarily optimizes query performance for time series in the tree mode, while delivering comprehensive improvements in database monitoring, performance, and stability. Specific release contents are as follows:
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* **Query Module**: Improved query performance for `SHOW/COUNT TIMESERIES/DEVICES` statements.
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* **Others**: Fixed security vulnerabilities CVE-2025-12183, CVE-2025-66566, and CVE-2025-11226.
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### V2.0.6.4
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V2.0.6.4 focuses on enhancements to the storage and AINode modules, resolves several product defects, and provides comprehensive improvements in database monitoring, performance, and stability. Specific release contents are as follows:
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* **Storage Module**: Added support for modifying the encoding and compression methods of time series in the tree model.
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* **Storage Module**: Added support for modifying the encoding and compression methods of time series in the tree mode.
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* **AINode**: Introduced one-click deployment and optimized model inference capabilities.
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V2.0.1.2 officially implements ​**​dual-model configuration (tree + table)​**​. The table model supports ​**​standard SQL queries​**​, diverse functions/operators, stream processing, and Benchmarking. Python client adds four new data types, and script tools support TsFile/CSV/SQL import/export. Key updates:
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* ​**​Time-Series Table Model:​**​
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* ​**​Time-Series Table Mode:​**​
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* Standard SQL: SELECT, WHERE, JOIN, GROUP BY, ORDER BY, LIMIT, nested queries
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* ​**​Query Module:​**​
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* Logical operators, math functions, time-series functions (e.g., DIFF)

‎src/UserGuide/latest-Table/IoTDB-Introduction/Release-history_timecho.md‎

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## 1. TimechoDB (Database Core)
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### V2.0.8.1
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> Release Date: 2026.02.04</br>
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> Download Link: Please contact Timecho Team to obtain the download link</br>
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> Package Name:timechodb-2.0.8.1-bin.zip</br>
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> SHA512 Checksum: 49d97cbf488443f8e8e73cc39f6f320b3bc84b194aed90af695ebd5771650b5e5b6a3abb0fb68059bd01827260485b903c035657b337442f4fdd32c877f2aca3
31+
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V2.0.8.1 introduces the **Object data type** to table models, significantly enhances audit logging capabilities, optimizes the tree model’s **OPC UA protocol**, adds **covariate-based forecasting** support in AINode, and enables **concurrent inference** in AINode. Additionally, comprehensive improvements have been made to database monitoring, performance, and stability. The detailed release notes are as follows:
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- **Query Module**: Added a list view of available DataNode instances, allowing users to [view each node's RPC address and port](../User-Manual/Maintenance-commands_timecho.md#_1-7-viewing-available-nodes).
35+
- **Query Module**: Introduced a new system table for [statistical query latency analysis](../Reference/System-Tables_timecho.md#_2-20-queries-costs-histogram).
36+
- **Storage Module**: Added SQL support to retrieve the full definition statements for [tables](../Basic-Concept/Table-Management_timecho.md#_1-4-view-table-creation-statement) and [views](../User-Manual/Tree-to-Table_timecho.md#_2-4-viewing-table-views).
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- **Storage Module**: Optimized the tree model’s [OPC UA protocol](../../latest/API/Programming-OPC-UA_timecho.md).
38+
- **System Module**: Added support for the [Object data type](../Background-knowledge/Data-Type_timecho.md) in table models.
39+
- **System Module**: Significantly enhanced and upgraded the [audit log](../User-Manual/Audit-Log_timecho.md) functionality.
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- **System Module**: Added a new system table to monitor [DataNode connection status](../Reference/System-Tables_timecho.md#_2-18-connections).
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- **AINode**: Integrated the built-in **Chronos-2** model, supporting [covariate-based forecasting](../AI-capability/AINode_Upgrade_timecho.md).
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- **AINode**: Built-in models **Timer-XL** and **Sundial** now support [concurrent inference](../AI-capability/AINode_Upgrade_timecho.md).
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- **Stream Processing Module**: When creating a full-data synchronization pipe, it will be [automatically split](../User-Manual/Data-Sync_timecho.md#_2-1-create-a-task) into two independent pipes—one for real-time data and one for historical data—whose remaining event counts can be monitored separately via the `SHOW PIPES` statement.
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- **Others**: Fixed security vulnerabilities **CVE-2025-12183**, **CVE-2025-66566**, and **CVE-2025-11226**.
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### V2.0.6.6
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> Release Date: 2026.01.20</br>

‎src/UserGuide/latest/IoTDB-Introduction/Release-history_timecho.md‎

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## 1. TimechoDB (Database Core)
2424

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### V2.0.8.1
26+
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> Release Date: 2026.02.04</br>
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> Download Link: Please contact Timecho Team to obtain the download link</br>
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> Package Name:timechodb-2.0.8.1-bin.zip</br>
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> SHA512 Checksum: 49d97cbf488443f8e8e73cc39f6f320b3bc84b194aed90af695ebd5771650b5e5b6a3abb0fb68059bd01827260485b903c035657b337442f4fdd32c877f2aca3
31+
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V2.0.8.1 introduces the **Object data type** to table models, significantly enhances audit logging capabilities, optimizes the tree model’s **OPC UA protocol**, adds **covariate-based forecasting** support in AINode, and enables **concurrent inference** in AINode. Additionally, comprehensive improvements have been made to database monitoring, performance, and stability. The detailed release notes are as follows:
33+
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- **Query Module**: Added a list view of available DataNode instances, allowing users to [view each node's RPC address and port](../User-Manual/Maintenance-commands_timecho.md#_1-7-viewing-available-nodes).
35+
- **Query Module**: Introduced a new system table for [statistical query latency analysis](../../latest-Table/Reference/System-Tables_timecho.md#_2-20-queries-costs-histogram).
36+
- **Storage Module**: Added SQL support to retrieve the full definition statements for [tables](../../latest-Table/Basic-Concept/Table-Management_timecho.md#_1-4-view-table-creation-statement) and [views](../../latest-Table/User-Manual/Tree-to-Table_timecho.md#_2-4-viewing-table-views).
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- **Storage Module**: Optimized the tree model’s [OPC UA protocol](../API/Programming-OPC-UA_timecho.md).
38+
- **System Module**: Added support for the [Object data type](../../latest-Table/Background-knowledge/Data-Type_timecho.md) in table models.
39+
- **System Module**: Significantly enhanced and upgraded the [audit log](../User-Manual/Audit-Log_timecho.md) functionality.
40+
- **System Module**: Added a new system table to monitor [DataNode connection status](../../latest-Table/Reference/System-Tables_timecho.md#_2-18-connections).
41+
- **AINode**: Integrated the built-in **Chronos-2** model, supporting [covariate-based forecasting](../../latest-Table/AI-capability/AINode_Upgrade_timecho.md).
42+
- **AINode**: Built-in models **Timer-XL** and **Sundial** now support [concurrent inference](../../latest-Table/AI-capability/AINode_Upgrade_timecho.md).
43+
- **Stream Processing Module**: When creating a full-data synchronization pipe, it will be [automatically split](../User-Manual/Data-Sync_timecho.md#_2-1-create-a-task) into two independent pipes—one for real-time data and one for historical data—whose remaining event counts can be monitored separately via the `SHOW PIPES` statement.
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- **Others**: Fixed security vulnerabilities **CVE-2025-12183**, **CVE-2025-66566**, and **CVE-2025-11226**.
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### V2.0.6.6
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V2.0.6.6 primarily optimizes query performance for time series in the tree mode, while delivering comprehensive improvements in database monitoring, performance, and stability. Specific release contents are as follows:
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* **Query Module**: Improved query performance for `SHOW/COUNT TIMESERIES/DEVICES` statements.
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* **Others**: Fixed security vulnerabilities CVE-2025-12183, CVE-2025-66566, and CVE-2025-11226.
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### V2.0.6.4

‎src/zh/UserGuide/Master/Table/IoTDB-Introduction/Release-history_timecho.md‎

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## 1. TimechoDB（数据库内核）
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### V2.0.8.1
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> 发版时间：2026.02.04</br>
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> 下载地址：请联系天谋工作人员进行下载</br>
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> 安装包名称：timechodb-2.0.8.1-bin.zip</br>
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> SHA512 校验码：49d97cbf488443f8e8e73cc39f6f320b3bc84b194aed90af695ebd5771650b5e5b6a3abb0fb68059bd01827260485b903c035657b337442f4fdd32c877f2aca3
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V2.0.8.1 版本表模型新增Object数据类型，强化升级审计日志功，优化树模型 OPC UA 协议，AINode 支持协变量预测，以及 AINode 支持并发推理等功能，同时对数据库监控、性能、稳定性进行了全方位提升。具体发布内容如下：
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- 查询模块：新增 DataNode 可用节点的列表展示，可[查看节点的 RPC 地址和端口](../User-Manual/Maintenance-statement_timecho.md#_1-7-查看可用节点)
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- 查询模块：表模型新增[统计查询耗时的系统表](../Reference/System-Tables_timecho.md#_2-20-queries-costs-histogram-表)
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- 存储模块：支持通过 SQL 查看[创建表](../Basic-Concept/Table-Management_timecho.md#_1-4-查看表的创建信息)/[视图](../User-Manual/Tree-to-Table_timecho.md#_2-4-查看表视图)的完整定义语句
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- 存储模块：优化树模型 [OPC UA 协议](../../latest/API/Programming-OPC-UA_timecho.md)
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- 系统模块：表模型新增 [Object 数据类型](../Background-knowledge/Data-Type_timecho.md)
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- 系统模块：强化升级[审计日志](../User-Manual/Audit-Log_timecho.md)功能
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- 系统模块：表模型新增 DataNode [节点连接情况](../Reference/System-Tables_timecho.md#_2-18-connections-表)的系统表
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- AINode：内置 chronos-2 模型，支持[协变量预测](../AI-capability/AINode_Upgrade_timecho.md)功能
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- AINode：Timer-XL、Sundial 内置模型支持[并发推理](../AI-capability/AINode_Upgrade_timecho.md)功能
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- 流处理模块：创建全量同步 pipe 会[自动拆分](../User-Manual/Data-Sync_timecho.md#_2-1-创建任务)为实时、历史两个独立 pipe，可通过 show pipes 语句分别查看剩余事件数
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- 其他：修复安全漏洞 CVE-2025-12183、CVE-2025-66566、CVE-2025-11226
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### V2.0.6.6
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> 发版时间：2026.01.20</br>
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V2.0.6.6 版本主要优化了树模型时间序列的查询性能，同时对数据库监控、性能、稳定性进行了全方位提升。具体发布内容如下：
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* 查询模块：优化了 show/count timeseries/devices 的查询性能
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* 其他：修复安全漏洞 CVE-2025-12183，CVE-2025-66566 and CVE-2025-11226
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* 查询模块：优化了 show/count timeseries/devices 的查询性能
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### V2.0.6.4
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‎src/zh/UserGuide/Master/Tree/IoTDB-Introduction/Release-history_timecho.md‎

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## 1. TimechoDB（数据库内核）
2424

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### V2.0.8.1
26+
27+
> 发版时间：2026.02.04</br>
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> 下载地址：请联系天谋工作人员进行下载</br>
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> 安装包名称：timechodb-2.0.8.1-bin.zip</br>
30+
> SHA512 校验码：49d97cbf488443f8e8e73cc39f6f320b3bc84b194aed90af695ebd5771650b5e5b6a3abb0fb68059bd01827260485b903c035657b337442f4fdd32c877f2aca3
31+
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V2.0.8.1 版本表模型新增Object数据类型，强化升级审计日志功，优化树模型 OPC UA 协议，AINode 支持协变量预测，以及 AINode 支持并发推理等功能，同时对数据库监控、性能、稳定性进行了全方位提升。具体发布内容如下：
33+
34+
- 查询模块：新增 DataNode 可用节点的列表展示，可[查看节点的 RPC 地址和端口](../User-Manual/Maintenance-statement_timecho.md#_1-7-查看可用节点)
35+
- 查询模块：表模型新增[统计查询耗时的系统表](../../latest-Table/Reference/System-Tables_timecho.md#_2-20-queries-costs-histogram-表)
36+
- 存储模块：支持通过 SQL 查看[创建表](../../latest-Table/Basic-Concept/Table-Management_timecho.md#_1-4-查看表的创建信息)/[视图](../../latest-Table/User-Manual/Tree-to-Table_timecho.md#_2-4-查看表视图)的完整定义语句
37+
- 存储模块：优化树模型 [OPC UA 协议](../API/Programming-OPC-UA_timecho.md)
38+
- 系统模块：表模型新增 [Object 数据类型](../../latest-Table/Background-knowledge/Data-Type_timecho.md)
39+
- 系统模块：强化升级[审计日志](../User-Manual/Audit-Log_timecho.md)功能
40+
- 系统模块：表模型新增 DataNode [节点连接情况](../../latest-Table/Reference/System-Tables_timecho.md#_2-18-connections-表)的系统表
41+
- AINode：内置 chronos-2 模型，支持[协变量预测](../../latest-Table/AI-capability/AINode_Upgrade_timecho.md)功能
42+
- AINode：Timer-XL、Sundial 内置模型支持[并发推理](../../latest-Table/AI-capability/AINode_Upgrade_timecho.md)功能
43+
- 流处理模块：创建全量同步 pipe 会[自动拆分](../User-Manual/Data-Sync_timecho.md#_2-1-创建任务)为实时、历史两个独立 pipe，可通过 show pipes 语句分别查看剩余事件数
44+
- 其他：修复安全漏洞 CVE-2025-12183、CVE-2025-66566、CVE-2025-11226
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### V2.0.6.6
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> 发版时间：2026.01.20</br>
@@ -32,7 +54,6 @@
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V2.0.6.6 版本主要优化了树模型时间序列的查询性能，同时对数据库监控、性能、稳定性进行了全方位提升。具体发布内容如下：
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* 查询模块：优化了 show/count timeseries/devices 的查询性能
35-
* 其他：修复安全漏洞 CVE-2025-12183，CVE-2025-66566 and CVE-2025-11226
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### V2.0.6.4
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