feat(dwh): update

Author: SamyOubouaziz

pages/data-warehouse/concepts.mdx

@@ -18,6 +18,12 @@ categories:
 Autoscaling refers to the ability of a Data Warehouse for ClickHouse® to automatically adjust the number of instances without manual intervention.
 Scaling mechanisms ensure that resources are provisioned dynamically to handle incoming requests efficiently while minimizing idle capacity and cost.
 
+## Bottomless storage
+
+Bottomless storage is a feature that allows ClickHouse® to separate compute and storage by offloading data to external object storage, such as Amazon S3-compatible services, while keeping frequently accessed data cached locally for fast queries. In ClickHouse®, this is implemented by transparently moving older or less-used data to remote storage, enabling virtually unlimited storage capacity without sacrificing performance for active workloads.
+
+Refer to the official [ClickHouse® documentation](https://clickhouse.com/docs/guides/separation-storage-compute) for more information.
+
 ## ClickHouse®
 
 ClickHouse® is a high-performance, column-oriented, distributed database management system designed for real-time analytics. It is optimized for handling large volumes of data with fast query performance, making it ideal for applications requiring up-to-date insights. ClickHouse stores data in a columnar format, which reduces I/O operations and speeds up query execution. It supports distributed processing across multiple nodes, enabling horizontal scaling and fault tolerance through replication. ClickHouse provides a powerful SQL interface and offers advanced features like real-time data ingestion, compression, and indexing, making it a robust solution for analytical workloads.

pages/data-warehouse/how-to/import-data.mdx

@@ -0,0 +1,18 @@
+---
+meta:
+  title: How to import data into a Data Warehouse for ClickHouse® deployment
+  description: This page explains how to import or transfer your existing data into a Scaleway Data Warehouse using ClickHouse®.
+content:
+  h1: How to import data into a Data Warehouse for ClickHouse® deployment
+  paragraph: This page explains how to import or transfer your existing data into a Scaleway Data Warehouse using ClickHouse®.
+tags: clickhouse data-warehouse deployment import copy transfer migrate data federation
+dates:
+  validation: 2025-05-13
+  posted: 2025-05-07
+categories:
+  - data-warehouse
+---
+
+Data federation allows you to query and combine data from multiple sources, enabling seamless analytics across different databases or storage systems without the need to move or duplicate data. With Data Warehouse for ClickHouse®'s [bottomless storage](/data-warehouse/concepts/#bottomless-storage) feature, you can decouple compute and storage, allowing your data to be stored cost-effectively in external object storage while maintaining high performance for queries.
+
+