- Added `ticket_generation_policy` column to `catalog_items` table to manage ticket generation strategies.
- Created `ticket_validity_times` table to allow multiple validity times per ticket.
- Introduced `validity_time_id` column in `event_dates` table to associate event dates with validity times.
- Established `ticket_validity_groups` and `ticket_validity_group_times` tables to group validity times for tickets.
- Updated seeder to set default ticket generation policy for specific tenant.
- Enhanced tests to cover new functionality, including ticket generation based on event dates and validity times.
- Refactored ticket validity checks to accommodate multiple validity times in a group.
