- - `Pleroma.Web.Endpoint`
- - `Pleroma.Repo`
-- part settings:
- - `Pleroma.Captcha` -> `:seconds_valid`
- - `Pleroma.Upload` -> `:proxy_remote`
- - `:instance` -> `:upload_limit`
-
-- Params:
- - `configs` => [
- - `group` (string)
- - `key` (string or string with leading `:` for atoms)
- - `value` (string, [], {} or {"tuple": []})
- - `delete` = true (optional, if parameter must be deleted)
- - `subkeys` [(string with leading `:` for atoms)] (optional, works only if `delete=true` parameter is passed, otherwise will be ignored)
+- partially settings inside these keys:
+ - `:seconds_valid` in `Pleroma.Captcha`
+ - `:proxy_remote` in `Pleroma.Upload`
+ - `:upload_limit` in `:instance`
+
+- Params:
+ - `configs` - array of config objects
+ - config object params:
+ - `group` - string (**required**)
+ - `key` - string (**required**)
+ - `value` - string, [], {} or {"tuple": []} (**required**)
+ - `delete` - true (*optional*, if setting must be deleted)
+ - `subkeys` - array of strings (*optional*, only works when `delete=true` parameter is passed, otherwise will be ignored)
+
+*When a value have several nested settings, you can delete only some nested settings by passing a parameter `subkeys`, without deleting all settings by key.*
+```
+[subkey: val1, subkey2: val2, subkey3: val3] \\ initial value
+{"group": ":pleroma", "key": "some_key", "delete": true, "subkeys": [":subkey", ":subkey3"]} \\ passing json for deletion
+[subkey2: val2] \\ value after deletion
+```
+
+*Most of the settings can be partially updated through merge old values with new values, except settings value of which is list or is not keyword.*
+
+Example of setting without keyword in value:
+```elixir
+config :tesla, :adapter, Tesla.Adapter.Hackney
+```
+
+List of settings which support only full update by key:
+```elixir
+@full_key_update [
+ {:pleroma, :ecto_repos},
+ {:quack, :meta},
+ {:mime, :types},
+ {:cors_plug, [:max_age, :methods, :expose, :headers]},
+ {:auto_linker, :opts},
+ {:swarm, :node_blacklist},
+ {:logger, :backends}