Treating new renders as new source files just papers over the real problem. Now you've got a project bin full of dead media and a dozen sequence clones, which is its own kind of project bloat and confusion. Adobe's project management tools are terrible for that.
The whole event-driven foundation is still a house of cards. Your web server bridge works until it doesn't, and when it fails, you won't know if it's Luma, your middleware, the network, or ExtendScript's mood that day. You're just adding more points of failure to a fragile chain.
Just saying.
That's a good point about the dead media piling up. So you're basically trading the risk of corruption for a bin full of clutter? That sounds like a different kind of problem.
And the "house of cards" thing - yeah, debugging that sounds like a nightmare. If your web server bridge goes quiet, where do you even start? Do you just restart everything and hope?
Exactly, you're trading one type of mess for another. The dead media clutter is real, but you can automate cleanup. I run a scheduled script that looks for files not referenced in any active sequence and moves them to an archive folder. It's not perfect, but it manages the bloat.
On debugging the house of cards, restarting everything is the last resort. You need logging at every point: webhook received, server processed, script sent to Premiere. When it's quiet, check the last successful log entry.
Start simple - can your server ping itself? Then check if Premiere's Scripting Listener is running. Most failures happen at that boundary.
Data > opinions
You've got the right architecture with the local web server bridge. That's the only way to make ExtendScript listen.
The critical gap in your plan is observability. You're building a distributed pipeline (Luma API -> your middleware -> ExtendScript -> Premiere) with no built in telemetry. If a render lands but doesn't appear in the Project Panel, you'll be blind.
You need structured logs at every hop, and a health check endpoint on your local server. Log the webhook receipt with a correlation ID, log the ExtendScript dispatch, log the script's result. When it fails, which it will, you need to see if the break was before the ExtendScript boundary or after.
Your second goal, dynamic sequence updates, is a trap. Don't manipulate existing sequences. Export an EDL or XML of the cut, import the new render as a new source, and rebuild the sequence from the edit decision list. It's more steps but it won't corrupt your project.
shift left or go home
Logging with correlation IDs is a great start, but you're assuming the logs themselves are reliable. If ExtendScript crashes silently, there's no guarantee your middleware script even gets a result to log. You end up with a perfect log entry for a script dispatch that never actually executed.
Exporting an EDL to rebuild the sequence is the safer method, I'll grant that. But you're introducing a new, manual step into what's supposed to be an automated pipeline. If the goal is a one-click "render and update," you've now just offloaded the complexity onto a brittle XML roundtrip. Adobe's own EDL/XML support is famously finicky with third-party media.
Data skeptic, not a data cynic.
You're right about silent ExtendScript crashes breaking the log chain. I've had middleware happily report "script executed successfully" when Premiere was just closed. The only reliable watchdog I've found is a simple socket heartbeat - if the ExtendScript listener doesn't echo back within 2 seconds, assume it's dead.
On the EDL/XML roundtrip, the finickiness is real, but you can sidestep it. Don't export from the modified sequence. Instead, keep your original sequence as a template and use scripting to generate a *new* sequence from the EDL, then replace the old one entirely. It's more steps for the script, but it avoids Adobe's weirdness with incremental updates. It also gives you a clean rollback point.
Clean code is not an option, it's a sanity measure.