A small extension for easily adding timestamps to models with one line in a migration. You can customize the fieldnames as well. By default adds `createdAt`, `updatedAt` and `deletedAt`.

SchemaBuilder+addTimestamps.swift

import Fluent

extension SchemaBuilder {
    
    enum TimestampTypes: Equatable {
        case createdAt(_ fieldName: String = "createdAt")
        case updatedAt(_ fieldName: String = "updatedAt")
        case deletedAt(_ fieldName: String = "deletedAt")
    }
    
    func addTimestamps(_ types: [TimestampTypes] = [.createdAt(), .updatedAt(), .deletedAt()]) -> SchemaBuilder {
        var value = self
        for type in types {
            switch type {
            case .createdAt(let fieldName):
                value = value.field(fieldName, .datetime)
            case .updatedAt(let fieldName):
                value = value.field(fieldName, .datetime)
            case .deletedAt(let fieldName):
                value = value.field(fieldName, .datetime)
            }
        }
        return value
    }
    
}

Use like so:

struct Migration: Fluent.Migration {
        func prepare(on database: Database) -> EventLoopFuture<Void> {
            database.schema(Contact.schema)
                .id()
                .addTimestamps()
                .create()
        }
        
        func revert(on database: Database) -> EventLoopFuture<Void> {
            database.schema(Contact.schema)
                .delete()
        }
    }