def self.down
    remove_foreign_key :esa_accounts, name: "esa_accounts_chart_id_fk"
    remove_foreign_key :esa_amounts, name: "esa_amounts_account_id_fk"
    remove_foreign_key :esa_amounts, name: "esa_amounts_transaction_id_fk"
    remove_foreign_key :esa_contexts, name: "esa_contexts_account_id_fk"