docs: move Database Group creation to Administration section

mintlify/administration/database-group.mdx

@@ -0,0 +1,87 @@
+---
+title: Database Group
+---
+
+<PricingPlanBlock feature_name='BATCH_CHANGE' />
+
+Database groups are a powerful feature in Bytebase that allow you to manage collections of databases as a single unit. This simplifies operations when you need to apply consistent changes or run queries across multiple databases with similar structures.
+
+## Overview
+
+A database group is a logical collection of databases that share common characteristics. Instead of selecting databases individually for each operation, you can define a group once and reuse it for batch operations.
+
+Database groups are particularly useful in the following scenarios:
+
+- **Multi-Tenant SaaS Applications**: Software as a Service providers often maintain separate database instances for each customer or tenant. Database groups enable you to apply updates across all tenant databases simultaneously while maintaining isolation.
+
+- **Geographic Distribution**: Organizations operating across multiple regions (US, EU, AP) often deploy separate database instances for compliance, latency, or data sovereignty requirements. Groups help manage these regional deployments efficiently.
+
+- **Database Sharding**: For applications using horizontal partitioning, database groups simplify managing sharded databases by treating all shards as a cohesive unit during schema migrations.
+
+## Creating a Database Group
+
+### Prerequisites
+- You must have appropriate project permissions
+- Target databases should already be added to your Bytebase project
+
+### Steps
+
+1. **Navigate to Database Groups**
+
+   Within your project, click **Database > Groups** in the left sidebar.
+
+   ![bb-project-groups-create](/content/docs/change-database/batch-change/bb-project-groups-create.webp)
+
+2. **Create New Group**
+
+   Click **New database group** to open the creation dialog.
+
+3. **Configure Group Settings**
+
+   - **Name**: Provide a descriptive name for your database group
+   - **Description** (optional): Add details about the group's purpose
+   - **Database Selection Rules**: Define criteria to automatically include databases
+
+   ![bb-new-db-group-with-raw](/content/docs/change-database/batch-change/bb-new-db-group-with-raw.webp)
+
+### Database Selection Methods
+
+#### Basic Filtering
+Select databases based on:
+- Environment (Development, Staging, Production)
+- Instance location
+- Database name patterns
+
+#### Advanced Filtering with Labels
+For more complex scenarios, use database labels with raw expressions:
+
+```
+Where resource.labels.YOUR_LABEL_KEY == "YOUR_LABEL_VALUE"
+and has(resource.labels.YOUR_LABEL_KEY)
+```
+
+**Example expressions:**
+- Filter by tenant: `Where resource.labels.tenant == "enterprise" and has(resource.labels.tenant)`
+- Filter by region: `Where resource.labels.region == "us-west" and has(resource.labels.region)`
+- Combine multiple labels: `Where resource.labels.tier == "premium" and resource.labels.region == "eu" and has(resource.labels.tier) and has(resource.labels.region)`
+
+4. **Save the Configuration**
+
+   Click **Save** to create the group. The new group will appear in your database groups list and be available for batch operations.
+
+## Managing Database Groups
+
+### Editing Groups
+To modify an existing group:
+1. Navigate to **Database > Groups**
+2. Click on the group name
+3. Update the configuration as needed
+4. Save your changes
+
+### Deleting Groups
+To remove a database group:
+1. Navigate to **Database > Groups**
+2. Click the delete icon next to the group
+3. Confirm the deletion
+
+**Note**: Deleting a group does not affect the underlying databases; it only removes the grouping configuration.

mintlify/change-database/batch-change.mdx

@@ -21,30 +21,11 @@ Then Bytebase will then create an issue to track the multi-database changes. You
 
 <PricingPlanBlock feature_name='BATCH_CHANGE' />
 
-If you always change a fixed set of databases together, you can pre-define a `database group` to enclose those databases. Typical scenarios of using database group are:
+Database groups allow you to manage and batch change multiple databases together. This is particularly useful for SaaS multi-tenant architectures, geographic deployments, or database partitioning scenarios.
 
-- A Software as a Service (SaaS) provider provides separate database instances for each of its customers (aka. tenants) alongside their application deployments.
-- For compliance and performance reasons, companies provision separate database instances in US, EU, AP respectively.
-- For scaling, companies create partitioned databases.
-
-### Create a database group
-
-1. Within a project, click **Database > Groups** on the left-side bar. Then click **New database group** to create a new database group.
-
-   ![bb-project-groups-create](/content/docs/change-database/batch-change/bb-project-groups-create.webp)
-
-1. Fill in the name and rules for filtering the desired databases.
-
-   ![bb-new-db-group-with-raw](/content/docs/change-database/batch-change/bb-new-db-group-with-raw.webp)
-
-   _If you want to use a **database label** as a filter condition, you may use **raw expression** with the following structure:_
-
-   ```
-   Where resource.labels.YOUR_LABEL_KEY == "YOUR_LABEL_VALUE"
-   and has(resource.labels.YOUR_LABEL_KEY)
-   ```
-
-1. Click **Save**, you'll see the newly created group in the list.
+<Card title="Database Group Configuration" icon="layer-group" href="/administration/database-group">
+  Learn how to create and manage database groups
+</Card>
 
 ### Batch change databases in a group
 

mintlify/docs.json

@@ -233,6 +233,7 @@
               "administration/mode",
               "ai-assistant",
               "change-database/environment-policy/overview",
+              "administration/database-group",
               "administration/customize-logo",
               "security/watermark",
               "administration/announcement",