There is no global "undo everything Kometa ever did" after the fact since no history is kept.
The only "totally undo everything Kometa has ever done to this Plex server" process is to restore your Plex appdata from the backup you took prior to using Kometa.
If you have not created a metadata backup in advance, there is probably no way to restore things that Kometa has changed.
Kometa can make a metadata backup for you. This backup is a YAML file that contains things like ratings, titles, summaries, etc.
You can use this backup to revert changes that Kometa has made.
Chazlarson has created a metadata backup script that backs up more metadata than Kometa does,
including artwork. This script can be used to create a backup that can be used to revert changes that Kometa has made.
Both of these backups are only useful if you have created them before you need them.
The remarks that follow apply in the absence of a metadata backup.
If you have used Kometa to set artwork based on URLs or local files, there is no way to restore what was there before Kometa changed it. No history of what was there before is kept.
If you have made mass updates to things like genres, ratings, and the like, what was there before is gone for good unless what was there is the default Plex value.
You can generally use Kometa to reset those values and let Plex fill them back in.
This is not always the case, however. If you had assigned user ratings to everything prior to using Kometa and then you told
Kometa to update the user rating with some other rating [say TMDB or the like], all your user ratings are lost with no backup.
If you have used Kometa to change titles, summaries, years, artwork, etc. with a Metadata File[all things you would have explicitly told it to do]
there is no way to restore what was there before Kometa changed it.
These services do not store season or episode-level ratings, using these options will allow show ratings to be
applied at the season or episode level.
YAML Lists Explained
YAML supports different ways to define lists. Below are some common methods:
1. List Within a Mapping
fruits:
- apple
- banana
- cherry
2. Inline Style
fruits: [ apple, banana, cherry ]
Each style can be used depending on your needs. The block style is typically more readable for longer lists,
while the inline style is compact and useful for short lists.
YAML Dictionaries Explained
Dictionaries are used to associate key/value pairs that are unordered. Dictionaries can be nested by increasing
the indentation,
or new dictionaries can be created at the same level by resolving the previous one.
cache: true cache_expiration: 60
The "keys" are cache and cache_expiration and the "values" are true and
60 respectively.
You can use multiple score filters but the number will have to match every filter. All unrated items are considered
to have a 0 rating.
These filters only work if the URL is to the List View of the Letterboxd list (i.e. it should have
/detail/ in the URL) or to an account's Reviews (i.e. it should have
/USERNAME/films/reviews/ in the URL).
This filter only works if the URL is to the List View of the Letterboxd list (i.e. it should have
/detail/ in the URL).
When title is not provided and the mapping name was not specified as an ID, the default behaviour is to
use the mapping name as title for matching.
When mapping_id is not provided and the mapping name was specified as an ID, the default behaviour is
to use the mapping name as mapping_id for matching.
When the server does not have a Plex Pass then the Edition Field is not accessible. In this scenario, Kometa will
check the movie's filepath for {edition-...} to determine what the edition is.
Requires Plex Pass.
Must be using the New Plex Movie Agent or the New Plex TV Agent.
Each default has a key that when calling to effect a specific collection/overlay you must replace
<<key>> with when calling.
You can use current_year to have Kometa use the current year's value. This can be combined with a
-# at the end to subtract that number of years. i.e. current_year-2
Also filters out missing movies/shows from being added to Radarr/Sonarr. These values also cannot use the count
modifiers.
You can use current_year to have Kometa use the current year's value. This can be combined with a
-# at the end to subtract that number of years. i.e. current_year-2
Also filters out missing movies/shows from being added to Radarr/Sonarr. These values also cannot use the count
modifiers.
You can use current_year to have Kometa use the current year's value. This can be combined with a
-# at the end to subtract that number of years. i.e. current_year-2
Also filters out missing movies/shows from being added to Radarr/Sonarr. These values also cannot use the count
modifiers.
Also is a Tag Filter and can use all of those modifiers.
Requires Template Variables to function
Designed to use the TRaSH Guides filename naming scheme
Editions overlay is designed to use the Editions field within Plex (which requires Plex Pass to use) or the TRaSH Guides filename naming scheme
Designed to use the TRaSH Guides filename naming scheme
While these overlays can technically be applied at this level, they were not designed for it. For example, a show's
season cannot have a resolution since it is not a video file, and an episode cannot have a Common Sense rating since
only Movies and Shows are rated by Common Sense.