chore: update postgres description

Signed-off-by: Thomas Stocker <thomas.stocker.pro@gmail.com>

docs/DOCKER_SERVICES.md

@@ -17,9 +17,9 @@ The development stack includes 10 services organized into the following categori
 
 **Image**: `postgres:17.4`
 **Port**: `5432`
-**Purpose**: Primary database for storing all compliance data
+**Purpose**: Database for storing all compliance data
 
-PostgreSQL is the main relational database that stores:
+PostgreSQL is the relational database that stores:
 - User accounts and organizations
 - Compliance frameworks and controls
 - Audit trails and evidence
@@ -27,6 +27,8 @@ PostgreSQL is the main relational database that stores:
 - Risk assessments
 - Vendor information
 
+(This list is not exhaustive and can be extended as the application grows.)
+
 #### Configuration
 
 ```yaml