[FSTORE-1980] allow for mysql in addition to postgres connector for sql

docs/concepts/fs/feature_group/external_fg.md

@@ -4,6 +4,6 @@ An external feature group doesn't allow for offline data ingestion or modificati
 You can also perform SQL operations, including projections, aggregations, and so on.
 The SQL query is executed on-demand when HSFS retrieves data from the external Feature Group, for example, when creating training data using features in the external table.
 
-In the image below, we can see that HSFS currently supports a large number of data sources, including any JDBC-enabled source, Snowflake, Data Lake, Redshift, BigQuery, S3, ADLS, GCS, RDS, and Kafka
+In the image below, we can see that HSFS currently supports a large number of data sources, including any JDBC-enabled source, Snowflake, Data Lake, Redshift, BigQuery, S3, ADLS, GCS, SQL, and Kafka
 
 <img src="../../../../assets/images/concepts/fs/fg-connector-api.svg">

docs/index.md

@@ -82,7 +82,7 @@ hide:
                     <div class="db_frame-top"></div>
                     <div class="db_frame-mid"></div>
                   </div>
-                  <div class="name_item db"><a href="./user_guides/fs/data_source/creation/rds/">RDS</a></div>
+                  <div class="name_item db"><a href="./user_guides/fs/data_source/creation/sql/">SQL</a></div>
                 </div>
               </div>
             </div>

docs/user_guides/fs/data_source/creation/sql.md

@@ -0,0 +1,64 @@
+# How-To set up an SQL Data Source
+
+## Introduction
+
+The SQL Data Source connects Hopsworks to a Relational Database Service such as MySQL or PostgreSQL.
+Using this connector, you can query and update data in your relational database from Hopsworks.
+
+In this guide, you will configure a Data Source in Hopsworks to securely store the authentication information needed to set up a connection to your database instance.
+When you're finished, you'll be able to query your SQL database using HSFS APIs.
+
+!!! note
+    Currently, it is only possible to create data sources in the Hopsworks UI.
+    You cannot create a data source programmatically.
+
+## Prerequisites
+
+Before you begin, ensure you have the following information from your database instance:
+
+- **Host:** The endpoint for your database instance.
+
+    Example from AWS:
+      1. Go to the AWS Console → `Aurora and RDS`
+      2. Click on your DB instance.
+      3. Under `Connectivity & security`, you'll find the endpoint, e.g.:
+        `mydb.abcdefg1234.us-west-2.rds.amazonaws.com`
+
+- **Database:** The name of the database to connect to.
+
+- **Port:** The port to connect to (e.g. 3306 for MySQL, 5432 for PostgreSQL).
+
+- **Username and Password:** A username and password with the necessary permissions to access the required tables.
+
+## Creation in the UI
+
+### Step 1: Set up a new Data Source
+
+Head to the Data Source View on Hopsworks (1) and set up a new data source (2).
+
+<figure markdown>
+  ![Data Source Creation](../../../../assets/images/guides/fs/data_source/data_source_overview.png)
+  <figcaption>The Data Source View in the User Interface</figcaption>
+</figure>
+
+### Step 2: Enter SQL Settings
+
+Enter the details for your database.
+Start by giving the connector a **name** and an optional **description**.
+
+1. Select "SQL" as the storage.
+2. Select the database type (e.g. MySQL or PostgreSQL).
+3. Enter the host endpoint.
+4. Enter the database name.
+5. Specify the port.
+6. Provide the username and password.
+7. Click on "Save Credentials".
+
+<figure markdown>
+  ![SQL Connector Creation](../../../../assets/images/guides/fs/data_source/sql_creation.png)
+  <figcaption>SQL Connector Creation Form</figcaption>
+</figure>
+
+## Next Steps
+
+Move on to the [usage guide for data sources](../usage.md) to see how you can use your newly created SQL connector.

docs/user_guides/fs/data_source/index.md

@@ -43,7 +43,7 @@ For AWS the following storage systems are supported:
 
 1. [S3](creation/s3.md): Read data from a variety of file based storage in S3 such as parquet or CSV.
 2. [Redshift](creation/redshift.md): Query Redshift databases and tables using SQL.
-3. [RDS](creation/rds.md): Query Amazon RDS (Relational Database Service) using SQL.
+3. [SQL](creation/sql.md): Query Amazon SQL (Relational Database Service) using SQL.
 
 ## Azure
 

docs/user_guides/fs/feature_group/create_external.md

@@ -158,15 +158,31 @@ To create a feature group, proceed by clicking `Next: Select Tables` once all of
   </figure>
 </p>
 
+In the UI you can either select one or more tables or define a custom SQL query.
+
+### Option A: Select tables
+
 The database navigation structure depends on your specific data source.
 You'll navigate through the appropriate hierarchy for your platform—such as Database → Schema → Table for Snowflake, or Project → Dataset → Table for BigQuery.
 
-In the UI you can select one or more tables, for each selected table, you must designate one or more columns as primary keys before proceeding.
-You can also optionally select a single column as a timestamp for the row (supported types are timestamp, date and bigint), edit names and data types of individual columns you want to include.
+Select one or more tables. For each selected table, you must designate one or more columns as primary keys before proceeding.
+You can also optionally select a single column as a timestamp for the row (supported types are timestamp, date and bigint), and edit names and data types of individual columns you want to include.
+
+<p align="center">
+  <figure>
+    <img src="../../../../assets/images/guides/fs/data_source/configure_feature_group_table.png" style="border: 10px solid #f5f5f5" alt="Select Table in Data Sources and specify features">
+  </figure>
+</p>
+
+### Option B: Define a SQL query
+
+Instead of selecting a table, you can write a custom SQL query to define the feature group.
+This is useful when you need to join multiple tables or apply transformations at read time.
+As with the table option, you must designate one or more columns as primary keys and optionally select a timestamp column.
 
 <p align="center">
   <figure>
-    <img src="../../../../assets/images/guides/fs/data_source/configure_feature_group.png" style="border: 10px solid #f5f5f5" alt="Select Table in Data Sources and specify features">
+    <img src="../../../../assets/images/guides/fs/data_source/configure_feature_group_query.png" style="border: 10px solid #f5f5f5" alt="Define a SQL query in Data Sources and specify features">
   </figure>
 </p>
 

mkdocs.yml

@@ -70,7 +70,7 @@ nav:
                   - ADLS: user_guides/fs/data_source/creation/adls.md
                   - BigQuery: user_guides/fs/data_source/creation/bigquery.md
                   - GCS: user_guides/fs/data_source/creation/gcs.md
-                  - RDS: user_guides/fs/data_source/creation/rds.md
+                  - SQL: user_guides/fs/data_source/creation/sql.md
               - Usage: user_guides/fs/data_source/usage.md
           - Feature Group:
               - user_guides/fs/feature_group/index.md