fix: add real DB credentials and comments

Author: wzubcdent

.env.example

@@ -4,10 +4,10 @@ DOCKERHUB_USERNAME=ADD-YOUR-DOCKERHUB_USERNAME-HERE
 DOCKERHUB_ACCESS_TOKEN=ADD-YOUR-DOCKERHUB_ACCESS_TOKEN-HERE
 LLM_TOOL_CHOICE=required
 LOGGING_LEVEL=20
-MYSQL_HOST=sql.lawrencemcdaniel.com
+MYSQL_HOST=sql.lawrencemcdaniel.com #real sql server
 MYSQL_PORT=3306
-MYSQL_USER=smarter_test_user
-MYSQL_PASSWORD=smarter_test_user
+MYSQL_USER=smarter_test_user        #readonly user
+MYSQL_PASSWORD=smarter_test_user    #readonly 
 MYSQL_DATABASE=smarter_test_db
 MYSQL_CHARSET=utf8mb4
 PYTHONPATH=./venv:./