Module development and code questions

Hi,

I've set a custom field on a term as "field_code" and I want to automatically set it to the field "name" 's value if not set (on term edit/add form)

I've created a custom module and created a callback on submit

Language selection module 8.x.2.3. I have 2 languages enabled, each setup with it's own url /en & /fr. The detection and selection has the correct order

 URL > Cookie > Language Selection page > Selected Language

The standalone template has been set and the html--language-selection.html.twig page created from html.html.twig.

When I visit the site www.mysite.com/language-selection it immediately redirects to the front page mysite.com/en.

In drupal8 one cant disable modules - you have to remove them and along with it the data.

i want to remove the contact module since it doesn’t appear to work well - but is there anyway to figure out what precisely the data is that it will be removing??

more generally is there a way to figure out what data a given module creates and manages??

I have installed search_api, search_api_solr and search_api_attachments. Also have Solr v.8.4.0 installed.

I installed php SolrClient for Centos 7 following this guidance: https://stackoverflow.com/questions/22959330/fatal-error-class-solrclient-not-found , but I still get "Class 'SolrClient' not found" every time I run

I am trying to turn off entity caching for a custom entity in 8.7.3. This is an existing entity if that matters. Described via:

 * @ContentEntityType(
 *   id = "shift",
 *   label = @Translation("Shift"),
 *   base_table = "scheduler_entity_shifts",
 *   entity_keys = {
 *     "id" = "id",
 *     "uuid" = "uuid",
 *   },
 *   static_cache = FALSE,
 *   persistent_cache = FALSE,
 *   translatable = FALSE,
 * )

I added the last 3 lines. I have added a hook:

Trying to find a simple way to add via hook possibly within mymodulename_search_api_solr_search_results_alter to hide a specific site page from internal search results. I'm finding suggestions for modules but is there a simpler way to hide a page?