Module development and code questions

Hi,

I have successfully used the Search API Attachment to index PDFs,

and have created an Index View for searching it.

I am wondering if it is possible to apply this filter to an existing Content View?

I recently did an upgrade of my website from Drupal 9.5.10 to Drupal 10.0.11. But my Status page reports following error:-

Mismatched entity and/or field definitions
The following changes were detected in the entity type and field definitions.

Content

• The node.field_date_time field needs to be updated.
• The node.field_event_date field needs to be updated.

Running Drupal 10.5. Is it possible to use drush to automate creating block content, saving in the database, assign it to a region and have it displayed?

I have found information how to create new modules on line but being a newbie this seems to be different from creating content, store it in the database, assign it to a region block to have it displayed, all using drush.

Thanks in advance.

For the moment, each authenticated user generate a specific page cache (node entity) when he navigate on the website. 

Is there a possibility to use the same cache page (news node) for all users with a specific role (eg editor) ?

Do I use the cache_api for this ?

Thanks for yours examples and replies.

I created a new types of content (import) to which it imports data from CSV files. 
This node contains the field (field_result) in which the value is stored.

I added views that displays all nodes in the form of a table.

I want to add programmatically three rows to the view: sum, average and min

Now the table looks like this:

| Node name | field_result
------------------------------
| node1         |  3
| node2         |  5
| node3         |  2
 

I have nodes with puzzles. I store extra info on the puzzle (say puzzle_sol) in a different table. I add this extra info to node in 'hook_node_storage_load' in my module. I then attach a special library to the page in page_attachments hook. There I use the above extra info to decide whether to attach the library or not. (if puzzle_sol was added, then attach the library ... else not)

This whole strategy is working without absolutely any issue.

Now the problem.