This commit introduces significant updates to the cost management functionality, including:
- New endpoints for retrieving cost summaries and generating expenses from lists, improving user interaction with financial data.
- Implementation of a service layer for cost-related logic, encapsulating the core business rules for calculating cost summaries and managing expenses.
- Introduction of a financial activity endpoint to consolidate user expenses and settlements, enhancing the user experience by providing a comprehensive view of financial activities.
- Refactoring of existing code to improve maintainability and clarity, including the addition of new exception handling for financial conflicts.
These changes aim to streamline cost management processes and enhance the overall functionality of the application.
- Introduced a new `RecurrencePattern` model to manage recurrence details for expenses, allowing for daily, weekly, monthly, and yearly patterns.
- Updated the `Expense` model to include fields for recurrence management, such as `is_recurring`, `recurrence_pattern_id`, and `next_occurrence`.
- Modified the database schema to reflect these changes, including alterations to existing columns and the removal of obsolete fields.
- Enhanced the expense creation logic to accommodate recurring expenses and updated related CRUD operations accordingly.
- Implemented necessary migrations to ensure database integrity and support for the new features.
- Added support for recurring expenses, allowing users to define recurrence patterns (daily, weekly, monthly, yearly) for expenses.
- Introduced `RecurrencePattern` model to manage recurrence details and linked it to the `Expense` model.
- Implemented background job scheduling using APScheduler to automatically generate new expenses based on defined patterns.
- Updated expense creation logic to handle recurring expenses, including validation and database interactions.
- Enhanced frontend components to allow users to create and manage recurring expenses through forms and lists.
- Updated documentation to reflect new features and usage guidelines for recurring expenses.
