Which table (and column) has the content of configured get_post_meta?

Post meta data is stored in the wp_postmeta table, the prefix wp_ may also be something else depending on your setup, in the meta_value column.

If there isn’t a metabox in the post edit screen for updating the value, then instead of modifying the database directly you could temporarily add update_post_meta() call to your functions.php file (hooked to some action for example) to change the value – removing the function afterwards.

Or if WP CLI is available, use wp post meta update command.

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