Trakt to CW & Trakt/CW to SIMKL

[rala72]

I set up CW today and configured Trakt, Plex & SIMKL.
Docker container on Synology NAS - version 0.12.1.
(Post copied and adapted from a Reddit post to add some context and details.)

First I tried to sync from Trakt to CW and SIMKL, but for SIMKL I got several add entry suggestions which were definitely in SIMKL already, so I pruned the DB there (I made a backup before, of course).
My plan is to use Trakt as the main DB (for now, still wanting to migrate away), use CW as the backup and sync the state to SIMKL.
After pruning SIMKL, I synced again from CW to SIMKL (to avoid many requests on Trakt side) and noticed that there are many shows in watch with S1E1 unwatched, which should definitely have entries there. So I checked the CW DB and noticed that the entries are missing there. I also tried running a Trakt to SIMKL Sync, but these entries are also not added.

My Trakt history currently has 7602 entries, according to their homepage.
In CW I only have ~5000 entries and during sync only 7046 are showing in UI.
If I do a dry run or a normal one, it fetches 7046 history entries from Trakt, but some shows (like "Drake & Josh" which is an old entry in history) are not in CW history - only in ratings, for example.
So I think only older entries are affected.

What can I do to get this work?

Edit: looks like the logs have been cleared after reboot during last freeze, trying again and update them in a sec.

I removed the files as they are analyzed by me.

[cenodude]

• Your trakt records 7135 history entries: 835 movie watches and 6300 episode watches.
• Drake & Josh is present in ratings but absent from both history baselines, including searches by its IDs.
• Plenty of older history exists, including episode watches from 2008–2013.

My best guess is that Trakt history items are missing a watch_date and thats required in CrossWatch.
- Check whether a missing Drake & Josh episode shows an actual watched date or an unknown date on Trakt.

I dont recommend another SIMKL purge: the missing entries are already absent from the exported Trakt baseline.

If the missing episodes has a actual watched date in Trakt then we need to dive further.

[cenodude]

How much memory you have on the Synology NAS for containers?

[cenodude]

1500 items will take approx 20 sec so 20K items should take like 4 or 5 minutes.

[rala72]

How much memory you have on the Synology NAS for containers?

I linked it to a storage folder where I have way more than 1 TB empty space, if that's your question.
For other limitations/specs I have to check how to figure that out when I'm back on the Synology Container Manager.

1500 items will take approx 20 sec so 20K items should take like 4 or 5 minutes.

That was also the time the dry run took (resulting in 0 entries to adapt).
That's why I am/was confused the regular one takes so long applying these zero changes.

[cenodude]

I mean memory, not disk space. For 25,000 items, you need approximately 300 to 500 MB of memory at minimum, preferably 1 GB or more. Syncing can be very demanding on NAS devices. See the https://wiki.crosswatch.app/getting-started/limitations

[rala72]

Ah, so RAM; I have 10 GB in total.
Currently ~900 MB empty and 7 GB temp/cached ("Zwischengespeichert") - meaning only 2,5 GB used.
Data snapshot according to Synology Resource Manager.

[cenodude]

Back to the issue.. i see a pagination issue can happen but in very specific cases. Let me fix that and then i give you a link to the dev-image to test it out.. i will also give you some tips to clean stuff again.. so you start fresh.

[cenodude]

Oke what you can try is the following:

1. update the image from your container to ghcr.io/cenodude/crosswatch-dev:dev-db
2. You should now be on v0.12.4-dev
3. Clear all the cache you have:
   In maintenance tools:

and then you CW tracker:

4. enable debug

5. lets sync:
   Only pick the trakt to CW pair:

and then view details and debug

when its done you can copy/paste the log in a text file or something and upload it here.

[rala72]

Do you know why these entries were not synced to CW? At least according to CW it has the data.
Trakt->CW sync logs are also above, here are all debug logs:
crosswatch-debug-debug-2026-09-21__trakt-cw.log
crosswatch-debug-debug-2026-09-21__trakt-simkl.log
crosswatch-debug-debug-2026-09-21__cw-simkl.log

Unrelated (I assume): how to resolve such warnings/erros? Retrying just shows this again.
Do I have to reset the sync state/clear the cache?

[cenodude]

Thats a strange result. Did you enabled rewatches by any change? Can you update your ghcr.io/cenodude/crosswatch-dev:dev-db and try again?

[rala72]

Yes, I do have it enabled everywhere since I want to get all history entries of each media (or am I misunderstanding this feature).
Most of the entries on top should be single entries, though.

I updated and run the sync jobs:

• Trakt->CW again with no suggested changes in review.
• CW->SIMKL had 1630 changes where 515 needed attention (I think I had this also before the update).
  Result is 4 added and for 1111 it's "Not confirmed"/"apply:add:failed" (the 515 from line above have not been selected).
• Trakt->SIMKL: still the same 16 entries.
  The first three entries (trakt movies) can be added (again; result: simkl_write_response_unconfirmed:add);
  the others have simkl_anime_season_zero_unmapped (blurred entries & PKMN) or simkl_not_found:episodes (Mr. Bean, Nick Knatterton, American Dragon: Jake Long).

It looks like for the movies the SIMKL data is a mess (or different).
A Whisker Away is a anime-series with only one episode instead of a movie.
tmdb:251783 is not found but I have this series as watched instead: https://simkl.com/tv/29690/kamikaze-love.
tmdb:17244 only shows AI search results but no movie entry.

Mr. Bean Special 1 is existing though.
For Nick Knatterton & American Dragon: Jake Long it looks like it was a episode which can be split over multiple entries (so one service has multiple entries, another has only one).

Pokémon has not all episodes trakt has and specials are also only 3 - so the mapping should be different here.

[cenodude]

Did you enabled Anime ID mapping and also enable it in the pair? Cause there is no easy sync solution that covers everything . SIMKL uses different Anime mapping then for example Trakt etc.. So if you want to sync Anime you need to enable it, both in connections:

and in the pair:

And even then Anime mapping is not guaranteed. Its also one of the most difficult things to get Anime correct

[rala72]

I didn't have it enabled yet, but I enabled it now for both pairs related to SIMKL and re-run it again.

• CW->SIMKL has added 7 entries (don't know which); 1.287 unresolved items.
  crosswatch-state-pairs-20260922-132916.json
• Trakt->SIMKL still has 16 entries: added 3; 11 unresolved
  crosswatch-state-pairs-20260922-161709.json

[cenodude]

And if you did, give me the latest state of the specific pair please:

[cenodude]

what does the analyzer report?

[rala72]

I double checked and PlexTraktSync is also syncing the watchlist, enabled it again - thanks for the input!
I did update to the newest version, clean CW tracker and synced back.
I increased the timeout of the reverse proxy to 600 for connection, read and write.
Anything relevant I have to check/verify after the upgrade regarding sync results to SIMKL (from Trakt/CW)?
edit: I created a Plex<>Trakt entry now to compare it to Trakt<>Plex, but once I enable Collection, two-way sync is disabled - so do I need an extra entry to just sync this in one direction?

Since you don't recommend setting up two-way sync for Plex, is there another feasible way to get what I would like to have?
Still haven't verified it yet, though.

[cenodude]

No nothing relevant to check, as long as you dont have like 1600 unresolved items i think you're good :-D

Collections are one-way only.. https://wiki.crosswatch.app/crosswatch/settings/configure-pairs/features/collection
The reason is that you want to be cautious with your collections. At least, that was my idea behind it

I generally don’t recommend two way syncs for history with Plex. As it also doesn’t support writing back the original watched date. So anything written to Plex gets today’s date. Ratings are fine i think.

[rala72]

Besides the agent for scrobbling & webhook for ratings (still disabled since I use the direct ones for now).
I set up now three Plex pairs inspired by your input:

• Plex<>Trakt for ratings
• Plex > Trakt for collection
• Trakt > Plex for history (for back syncing; better ideas welcome)

results:

• The ratings sync went fine (also the real one, not only dry run), it even found a conflict/update and resolved it for one entry.
  Some entries got the error, that it wasn't found in my library - maybe this would be nice as a feature to ignore these entries?
• The collection also added several entries.
• The history sync lists 2514 entries, but the first few of these look like they are not in my library - here would make a filter if in library also makes sense. I won't run this one for now.

I also got suggestions to use a central provider:

Like for history I'm doing it already?

The other entry is ratings:

If I enter CW as "central source" (so Trakt>CW and CW>SIMKL/MDBLIst)
I get it for more features (I assume because there are 5 providers then in total)?

But to sum up, the Plex Sync looks promising, except the history / filter.

[cenodude]

There isnt a history filter cause thats how it works :-D CrossWatch will need to do work to actual see whats in your libraries and what not. There is basically no alternatives to do that. Could be not in your library, wrong ID's etc etc .. there are many reasons.. some can be fixed with editor to remap these items and others cant cause you dont have them.. At the end they will be be unresolved for 3 syncs/times and then blacklisted and ignored for 30 days. Biut can be configured.

[rala72]

Fair enough.

I run the Trakt > Plex History sync now and 0 changes where applied but all 2514 were not found (or at least the ones I checked).

So I guess this one should be safe then as well meaning my basic setup I had in mind seems to workout! 🥰

Thank you very much for your help!

Tiny note if it went under your radar for future releases:

And another small thing I noticed: if you have dry run enabled and click on apply changes on the review page, you get a red alert showing that dry run is on - however this is hidden again only after a few ms.