- Implement `/history/<function_id>` route in timer routes to fetch and display function versions
- Create new Mithril `DiffView` component for comparing script versions
- Add new history template for timer functions with version comparison
- Include version diff functionality using AceDiff library
- Update header and edit templates to include history URL for timer functions
- Create new database table `timer_function_invocations` to track function executions
- Implement `/logs/<function_id>` route in timer routes to fetch and display invocation logs
- Add new logs template for timer functions with detailed invocation information
- Update header templates to include logs URL for timer functions
- Modify header template to use explicit `cancel_url` parameter
- Add `cancel_url` to new timer and HTTP function templates
- Remove default URL fallback in header template
- Add comprehensive routes for creating, editing, deleting, and toggling timer functions
- Create new HTML templates for timer function overview, new, and edit pages
- Extend Mithril editor component to support timer-specific settings like trigger type, frequency, and enabled status
- Implement database schema and versioning for timer functions
- Add UI improvements for timer function listing with detailed schedule and status information
