Among the meta tags that I would like to check for each post, is a new meta tag I would like to create, for which I will create a new column in the wp_posts table. The "area" tag. The reason I need this is to contain a numeric value, which will be stored with each post. This value will be read from the cookies of the user, and then stored in the database when a new post is created for that post, and it might change for the user from time to time depending on that cookies value. Then, when the posts will be retrieved, I want to check that value "area" in the wp_posts table in the database, and depending on that I will show the posts in the archive page.
Could you please guide me how to implement this? How can I create my own meta tag for WordPress that could be used within my template or within all my WordPress?
How can I add this value to the database with each single post created?
How can I read it from the database for each post?
I hope you can help me!
Thanks alot in advance