feat: add mongoDB changset example

docs/database-devops/use-database-devops/get-started/get-started-with-changelogs.md

@@ -0,0 +1,182 @@
+---
+title: Get Started with Changelogs
+description: Learn how to define changelogs for SQL and MongoDB in Harness Database DevOps.
+sidebar_position: 3
+sidebar_label: Get Started with Changelogs
+hide_table_of_contents: true
+---
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+# Get Started with Changelogs
+
+Harness Database DevOps supports changelogs in various formats to manage schema changes across environments. Below are examples of SQL and MongoDB changelogs to help you get started quickly.
+
+## Example Changelogs
+
+<Tabs>
+<TabItem value="sql" label="SQL Changelog" default>
+
+```yaml
+databaseChangeLog:
+  - changeSet:
+      id: product-table-v2
+      author: john-doe
+      labels: products-api 
+      comment: Creating product table for REST API
+      changes:
+        - createTable:
+            tableName: product
+            columns:
+              - column:
+                  name: id
+                  type: SERIAL
+                  constraints:
+                    primaryKey: true
+              - column:
+                  name: name
+                  type: VARCHAR(100)
+                  constraints:
+                    nullable: false
+              - column:
+                  name: price
+                  type: NUMERIC(10,2)
+                  defaultValue: 0.00
+                  constraints:
+                    nullable: false
+      rollback:
+        - dropTable:
+            tableName: product
+  - changeSet:
+      id: product-table-indexes-v2
+      author: john-doe
+      labels: products-api
+      comment: Adding indexes for the products table
+      changes:
+        - createIndex:
+            tableName: product
+            columns:
+              - column:
+                  name: name
+            indexName: idx_products_name
+      rollback:
+        - dropIndex:
+            indexName: idx_products_name
+            tableName: product
+  - changeSet:
+      id: product-sample-data-initial
+      author: john-doe
+      labels: products-api-v2
+      comment: Inserting initial sample data for non-production environments
+      changes:
+        - insert:
+            tableName: product
+            columns:
+              - column:
+                  name: name
+                  value: "Wireless Bluetooth Headphones"
+              - column:
+                  name: price
+                  value: 89.99
+        - insert:
+            tableName: product
+            columns:
+              - column:
+                  name: name
+                  value: "USB-C Charging Cable"
+              - column:
+                  name: price
+                  value: 15.99
+      rollback:
+        - delete:
+            tableName: product
+            where: name in ('Wireless Bluetooth Headphones', 'USB-C Charging Cable')
+  - changeSet:
+      id: product-sample-data-accessories
+      author: john-doe
+      labels: products-api
+      comment: Inserting accessories sample data for non-production environments
+      changes:
+        - insert:
+            tableName: product
+            columns:
+              - column:
+                  name: name
+                  value: "Wireless Mouse Pad"
+              - column:
+                  name: price
+                  value: 12.50
+        - insert:
+            tableName: product
+            columns:
+              - column:
+                  name: name
+                  value: "Ergonomic Laptop Stand"
+              - column:
+                  name: price
+                  value: 65.99
+      rollback:
+        - delete:
+            tableName: product
+            where: name in ('Wireless Mouse Pad', 'Ergonomic Laptop Stand')
+```
+
+</TabItem>
+<TabItem value="mongodb" label="MongoDB Changelog">
+
+```yaml
+databaseChangeLog:
+  - changeSet:
+      id: devteam:1
+      author: john-doe
+      comment: Create users collection
+      changes:
+        - createCollection:
+            collectionName: users
+            options: '{"validator": {"$jsonSchema": {"bsonType": "object", "required": ["name", "email"], "properties": {"name": {"bsonType": "string", "description": "User''s full name"}, "email": {"bsonType": "string", "description": "User''s email address"}, "status": {"bsonType": "string", "enum": ["active", "inactive", "pending"], "description": "Account status"}}}}, "validationAction": "warn", "validationLevel": "strict"}'
+  - changeSet:
+      id: devteam:2
+      author: john-doe
+      comment: Add unique index on email
+      changes:
+        - createIndex:
+            collectionName: users
+            keys: '{email: 1}'
+            options: '{unique: true, name: "idx_email_unique"}'
+  - changeSet:
+      id: devteam:3
+      author: john-doe
+      ignore: false
+      context: production
+      comment: Add compound index for user queries
+      changes:
+        - createIndex:
+            collectionName: users
+            keys: '{status: 1, createdAt: -1}'
+            options: '{name: "idx_status_created", background: true}'
+  - changeSet:
+      id: devteam:4-base
+      author: john-doe
+      ignore: false
+      changes:
+        - createCollection:
+            collectionName: orders
+  - changeSet:
+      id: devteam:4-index
+      author: john-doe
+      ignore: false
+      changes:
+        - createIndex:
+            collectionName: orders
+            keys: '{"userId": 1, "status": 1, "orderDate": -1, "totalAmount": 1}'
+            options: '{name: "orders_user_status_idx"}'
+  - changeSet:
+      id: devteam:5
+      author: john-doe
+      comment: Create products collection
+      changes:
+        - createCollection:
+            collectionName: products
+```
+</TabItem>
+</Tabs>