Staging -> Production: changes since May 2025

[anduimagui]

Summary

This pull request introduces enhanced support for user groups and signals, including new models, endpoints, and improved group management.

New Features

• Added new models: SignalWithUserGroups, SignalCreate, SignalUpdate, UserGroupWithUsers, and UserGroupComplete for richer API responses.
• Extended signal creation and update endpoints to support associating signals with user groups via user_group_ids.
• Added endpoint to retrieve a signal along with all its user groups.
• Enhanced user group endpoints to optionally include detailed user and signal information.
• Allowed group membership management using both user IDs and email addresses.
• Added admin assignment to user groups, including via query parameters.
• Improved endpoints for listing user groups with detailed user and signal data, supporting collaborative workflows.

Bug Fixes

• Improved error handling and logging for group and signal operations.
• Fixed issues with user ID/email handling in group membership.
• Ensured correct response models and data consistency for new endpoints.

Checklist

• I have read the contribution guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• I have added required dependencies to requirements.txt
• I have updated the documentation (if applicable).