# Packages
Package mysql defines the IssuanceChainStorage type, which implements IssuanceChainStorage interface with FindByKey and Add methods.
Package postgresql defines the IssuanceChainStorage type, which implements IssuanceChainStorage interface with FindByKey and Add methods.
# Functions
NewIssuanceChainStorage returns nil for Trillian gRPC, or mysql.IssuanceChainStorage or postgresql.IssuanceChainStorage when mysql or postgres is the prefix in database connection string.
# Interfaces
IssuanceChainStorage is an interface which allows CTFE binaries to use different storage implementations for issuance chains.