Hi Cary,

you can achieve this by two way's.

1. Sync all the templates to DB on an API call.
2. Register an event in IComponent , this event will trigger once template saved from the backend.

Please find the below samples

1. Sync all the templates to DB on an API call.

    [RoutePrefix("syncapi")]
   public class SyncApiController:UmbracoApiController
   {
   private IFileService _fileService;
    public SyncApiController(IFileService fileService){
   
   
     _fileService = fileService;
    }
   [HttpGet]
       [Route("template")]
       public  HttpStatusCode Template()
       {
            var all templates=_fileService.GetTemplates();//get all templates
           var homeTemplate = _fileService.GetTemplate("home");  //get template with -- alias "home"
           var content=homeTemplate.content; // get content/code in home template
           return HttpStatusCode.OK;
       }}
   

Api Call - http://localhost:1234/syncapi/template

1. Register an event in IComponent

Create a class file by inheriting IComponent & Register

Subscribing an Event

    // initialize: runs once when Umbraco starts
    public void Initialize()
    {
        RouteTable.Routes.MapMvcAttributeRoutes();
        log4net.Config.XmlConfigurator.Configure();
        GlobalConfiguration.Configuration.MapHttpAttributeRoutes();
        GlobalConfiguration.Configuration.Initializer(GlobalConfiguration.Configuration);
        GlobalConfiguration.Configuration.EnsureInitialized();
        //GlobalConfiguration.Configure(Register);
        // GlobalConfiguration.Configuration.EnableCors();

        FileService.SavedTemplate += Template_Saved;

    }

    private void Template_Saved(IFileService sender, SaveEventArgs<ITemplate> e)//this will trigger once the template saved
    {
        foreach (var savedItem in e.SavedEntities)
        {
            var content = savedItem.Content;
            var path = savedItem.Path;
        }
    }
    public static void Register(HttpConfiguration config)
    {
        var corsAttr = new System.Web.Http.Cors.EnableCorsAttribute("*", "*", "*");
        config.EnableCors(corsAttr);
    }
    public void Terminate()
    {
        FileService.SavedTemplate -= Template_Saved;
    }
}

Regards DK :)