[Feature Request] Support for Read-Only Database Connections

Feature Description

I’d like to request support for read-only database connections in the vscode-pgsql extension for Visual Studio Code. This feature would allow users to explicitly mark a PostgreSQL connection as read-only, preventing any data modification operations from being executed through that connection.

Proposed Capabilities

• Ability to mark a connection as read-only during creation or via connection settings.
• Clear visual indication that a connection is read-only (icon, badge, or label).
• Block or warn when attempting write operations, such as:
  • INSERT, UPDATE, DELETE
  • MERGE, TRUNCATE
  • CREATE, ALTER, DROP
• Optional confirmation dialog or error message when running write queries.
• Client-side enforcement regardless of database-level permissions (safety guard).

Problem & Motivation

Currently, vscode-pgsql does not provide a way to explicitly mark connections as read-only. When working with production or sensitive environments, this increases the risk of accidentally executing write operations from the editor.

Even when PostgreSQL permissions are correctly configured, a client-side read-only mode provides an additional safety layer and helps prevent human error.

Use Case

• Safely connecting to production databases for debugging or reporting.
• Allowing developers or analysts to explore data without modification risks.
• Enforcing team-wide safety practices when sharing connection profiles.
• Reducing accidental data changes during query execution.

Request

Please consider adding support for read-only connections in a future release of vscode-pgsql. Even a basic implementation that blocks write queries would significantly improve safety and confidence.

The issue names no files or tests. Start by locating the connection creation/settings entry points and the query execution path in the extension. Done would include a way to mark connections read-only, a visible indication, and blocking or warning on the listed write operations.