configuration.swift

var commands = CommandConfig.default()
commands.useFluentCommands()
services.register(commands)

migraton.swift

import FluentPostgreSQL
import Vapor

struct AddFieldMock: Migration {
    typealias Database = PostgreSQLDatabase
    
    static func prepare( on connection: PostgreSQLConnection ) -> Future<Void> {
        return Database.update(Acronym.self, on: connection) { builder in
            builder.field(for: \.someFIeld)
        }
    }
    
    static func revert(on connection: PostgreSQLConnection) -> EventLoopFuture<Void> {
        return Database.update(Acronym.self, on: connection) { builder in
            builder.deleteField(for: \.someFIeld)
        }
    }
}

revert.sh

vapor build && vapor run revert // To revert the last migration
vapor build && vapor run revert --all // To revert all migration