# Spec: Support Multiple Tags for Tasks and Notes

## Goal

Enable users to associate multiple tags with both tasks and notes, enhancing organization and search capabilities.

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## User Value

Users can categorize their tasks and notes more granularly, making it easier to find and filter information. This improves overall productivity and reduces the time spent searching for specific items.

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## Requirements

- Users must be able to add multiple tags to a single task.
- Users must be able to add multiple tags to a single note.
- The system should support adding new tags and selecting existing tags.
- Display of multiple tags associated with tasks and notes in the UI.
- Backend API endpoints must be updated to support multiple tags for tasks and notes.
- Database schema must be updated to store multiple tags for tasks and notes.

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## Acceptance Criteria

- [ ] When editing a task, a user can add more than one tag.
- [ ] When editing a note, a user can add more than one tag.
- [ ] All tags associated with a task are displayed when viewing the task.
- [ ] All tags associated with a note are displayed when viewing the note.
- [ ] Users can filter tasks by multiple tags.
- [ ] Users can filter notes by multiple tags.
- [ ] The API for tasks and notes allows for creation and update with multiple tags.
- [ ] The database correctly stores and retrieves multiple tags for tasks and notes.

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## Dependencies

None.

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## Risks

- **Data Migration**: Existing single-tag data will need to be migrated to the new multi-tag schema, potentially requiring a database migration script.
- **Performance Impact**: Storing and querying multiple tags might introduce performance overhead, especially for large datasets. This will need careful indexing and optimization.
- **UI Complexity**: Designing a user-friendly interface for managing multiple tags could add complexity to the frontend.
- **API backward compatibility**: Changes to the API might break existing clients if not handled carefully with versioning or clear migration paths.

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## Notes

- Consider a many-to-many relationship between tasks/notes and tags in the database.
- Frontend tag input should allow for auto-completion of existing tags.
- The API should handle tag creation on the fly if a new tag is submitted.
