Why empty tables in database (qa_postmetas, qa_tagmetas, qa_usernotices)?

Question

By curiosity, which of these tables (having 0 rows/entries) can be considered unnecessary?

I know that some were created by plugins, some are there be default:

qa_categories ← I am not using categories, that's why this is empty.

qa_categorymetas ← same

qa_messages ← I am not using PN that's why this is empty.

qa_postmetas ← what for?

qa_tagmetas ← what for?

qa_usermetas ← "Plugins etc... can use qa_usermetas for any meta information relating to users - see qa-db-metas.php." Clarified.

qa_usernotices ← what for?

 

Answer 1

qa_postmetas is for custom field for question. (ask form) like WordPress metabox usually store into wp_options but here it store into qa_postmetas. ( See Admin > Posting )

qa_tagmetas and qa_usernotice I still needs to check in details and update my answer once get detailed. Meantime hope if someone give more details on these.

Answer 2

I am also interested.

qa_categories:
Since I am using category, many records exist.

qa_categorymetas:
Attribute informations on each category are saved on this table.
Example : Permission to Categories

qa_messages:
Messages are saved as history only when admin->users->"Store and display private message history" is checked.

qa_postmetas:
Attribute informations on each question are saved on this table.
Example : Extra Question Field

qa_tagmetas:
Probably, this will be same as qa_categorymetas. However, since tags increase automatically, management of attributes is required time and effort. I think that many needs cannot be found.

qa_usermetas and qa_usernotices:
I would also like to know detailed usage.

Comments

thanks for the hints