Jissin Mathew
f3e42a8b17
User Story #1949 User Story #1950 **Changes** * Added `DataStoreLockGuard` header to project configuration and implemented the class for scoped mutex management. * Refactored `Invoice` model to replace CSV-based serialization with `SerializedInvoice` struct, removing legacy `getHeaders()` and string parsing logic. * Updated `DataStore::getInvoices()` to load records via `loadRecords`, refresh cache, and automatically enrich `Invoice` objects with linked `ServiceBooking` and `InventoryItem` entities. * Implemented `DataStore::saveInvoices()` using the `saveRecords<Invoice, SerializedInvoice>` template for direct shared memory persistence. * Integrated `DataStoreLockGuard` across all critical methods in `PaymentManagementService`: `sendPaymentReminders`, `generateInvoice`, `getInvoices`, `completePayment`, `getAllInvoices`, and `confirmPayment`. * Refactored invoice creation and modification flows to use `createNewRecord` for insertion and explicitly set `RecordState::MODIFIED` before triggering `saveInvoices()`. * Updated data access patterns to extract `.data` pointers from `TrackedRecord` wrappers instead of accessing raw map values directly. * Added validation logic in `getInvoices()` to throw `runtime_error` if referenced ServiceBookings or InventoryItems are missing. * Added necessary header dependencies (`Invoice.h`, `DataStoreLockGuard.h`) in service and store layers. Related work items: #1930, #1949, #1950
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