This commit introduces the initial set of database migrations required for setting up the foundational models of the messaging system within the application. These models include `GatewayUser`, `GatewayUserSetting`, `Notification`, and various scheduling entities to manage notification delivery timings. It lays the groundwork for linking users to their gateway preferences, storing customizable settings per gateway-user pair, and managing notifications with flexible scheduling options. This schema setup is crucial for supporting a dynamic and configurable messaging system, enabling efficient notification management and dispatching based on user preferences and predefined schedules.
By establishing a robust database schema upfront, we ensure that the application can scale effectively, facilitating ease of maintenance and future enhancements. This migration caters to the need for a cohesive and flexible data model to represent users, their notification preferences, and the logistics of notification dispatching and scheduling within the system.
