- Add CreateTransaction to insert new transaction records
- Add UpdateSubscriberBalance to increment/decrement balance using SQL expression
- Add CreatePaymentMethod, GetPaymentMethod, DeletePaymentMethod, and ListPaymentMethods for payment method CRUD
- Add GetTransaction, GetTransactionByGatewayID, GetTransactionByChargeID to query transactions by different IDs
- Add UpdateTransaction to save transaction changes
- Add List
- Add Database struct with GORM PostgreSQL connection
- Add IMSIAllocation model for IMSI range tracking and allocation
- Add NewDatabase function with connection pooling (10 idle, 100 max connections, 1h lifetime)
- Add AutoMigrate for Subscriber, ServicePlan, Session, UsageRecord, and IMSIAllocation models
- Add InitializeIMSIAllocation with default IMSI range (1-999999999)
- Add CRUD operations for subscribers (Create, Get, GetByIMSI, Update, List)
- Add ListSubscribers with pagination, filtering by status/
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