- 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.
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