Rebased onto main now that #102 has landed, and out of draft. The diff here is just the follow-up work.

Follow-up to #102, as promised there.

#102 stopped the refresh from building one giant list of episodes, but the added and updated lists it hands back still hold full Episode objects, so the peak just moves from the fetch to whatever holds those lists. On my library (65,926 episodes) I forced the pathological case, every episode marked updated, and the process peaked at 129.4 MiB against a 1 GB limit. Before, it was going over 1024 MiB and getting OOM-killed. The refs cost 242 bytes each.

The change is a frozen EpisodeRef dataclass carrying just the fields the post-refresh consumers actually read, plus the scheduler and status handlers updated to use it.

There's a second fix in here that I think is the more interesting one. Episodes that come back from a section search have librarySectionTitle set only on the MediaContainer, not on each Video, so the attribute is None on every item. plexapi treats None on a partial object as "go fetch the real value" (base.py:657, if value not in (None, []): return value), which means reading that one field reloads the entire item over the network. That was 65,925 extra metadata requests and about 19 minutes per refresh, all inside self._lock, and any one of them timing out took down the whole run. iter_episodes now stamps section.title onto each episode before yielding, the same thing plexapi does at video.py:1318. Measured 200 GETs down to 0, peak 165.9 to 129.4 MiB, runtime about 20 min down to 6m22s. The existing code pays this same cost today in the scheduler's item.librarySectionTitle.

Happy to split that stamp out into its own PR against #102 if you'd rather keep the two separate. It stands on its own and it's the smaller of the two.

Three things you should know before merging:

• This doesn't fix the notification storm. That's a separate problem and I haven't touched it.
• Log strings change for shows with an empty title. The refs carry the stamped section title, so a couple of messages read slightly differently than before.
• A show that can't be fetched is now skipped rather than fatal. I think that's the better behaviour, but it is a behaviour change and you may disagree.

I've been running this on my own setup since 16 July. Nine days in, the container's memory high-water is 180 MB against a 1 GB limit, with no restarts.

Tests: there are 9 covering EpisodeRef and iter_episodes, using fakes rather than a live server. The repo's old suite needed a real Plex server and a hardcoded episode count, and it died as collateral in 709cc76. I didn't try to revive it. If you'd rather not carry these, say so and I'll drop them.

Does this look like the right approach to you?