Fluent4 model with automigration example (automigration like in Fluent3)

fluent4+automigration.swift

// configure.swift
func configure(_ app: Application) throws {
    app.migrations.add(Todo(), to: .psql)
    
    try app.migrator.setupIfNeeded().wait()
    try app.migrator.prepareBatch().wait()
}

// Todo.swift
final class Todo: Model, Content {
    static let schema = "todos"
    
    @ID(key: "id")
    var id: UUID?

    @Field(key: "title")
    var title: String
    
    @Timestamp(key: "created_at", on: .create)
    public var createdAt: Date?

    @Timestamp(key: "updated_at", on: .update)
    public var updatedAt: Date?

    init() { }

    init(id: UUID? = nil, title: String) {
        self.id = id
        self.title = title
    }
}

extension Todo: Migration {
    func prepare(on database: Database) -> EventLoopFuture<Void> {
        database.schema(Self.schema)
            .field("id", .uuid, .identifier(auto: false))
            .field("title", .datetime, .required)
            .field("created_at", .datetime)
            .field("updated_at", .datetime)
            .create()
    }
    
    func revert(on database: Database) -> EventLoopFuture<Void> {
        database.schema(Self.schema).delete()
    }
}