- Added SendEngineDbContext for managing database interactions.
- Created SendEngineDbContextFactory for design-time database context creation.
- Established dependency injection for the infrastructure layer.
- Defined entity configurations for Tenant, MailingList, Subscriber, ListMember, EventInbox, Campaign, SendJob, SendBatch, DeliverySummary, AuthClient, AuthClientKey, and WebhookNonce.
- Generated initial database migration snapshot.
- Implemented installer program for database migration commands.
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