NewAuthService creates a new AuthService.

NewContractService creates a new contract service.

NewDB returns a new instance of DB with the given DSN.

NewStateService creates a new StateService.

NewUserService creates a new user service.

AuthService is a service for managing authentication.

ContractService is the postgres implementation of the contract service.

DB represents the database connection.

StateService is the implementation of service.StateService for PostgreSQL.

Tx wraps the SQL Tx object to provide a timestamp at the start of the transaction.

UserService represents a service for managing users.