- Introduced `invoice_period_flag_schema_bootstrap` to initialize the schema for invoice period flags. - Added `invoice_period_flag_service` to handle manual and automatic flag creation, updates, filtering, and context resolution. - Implemented lifecycle methods such as `createManualFlag`, `updateAutomaticFlagStatus`, and `applyFlagsToPeriodTypes` for handling invoice period flags and their usage in processing periods. - Included context-specific resolution methods for efficient flag management in invoicing workflows.