Set meta key for a query that is based on a CPT stored in a table

When I attempt to run the CLI command with an ACT called agenda, I get the error Pod unable to be deleted.

Considering the original question and context of Bricks Builder, it may be the case that the entire Pod is not stored in a table (Advanced Content Type), but rather it is using table storage for the post meta. Otherwise, the post type would not show up in the Bricks Builder query editor at all — not just the field.

If I run the command on a Post Type with Table-based Meta storage:

wp pods-convert migrate --pod=agenda_old --new_storage=meta --new_name=agenda_new

The output is:

Found pod agenda_old (#133 - post_type) to migrate.
Setting up new pod agenda_new2 (post_type).
Error: Error: Pod agenda_new2 already exists

…there is no Pod agenda_new2 and there was no 2.

Below is code for a WP CLI command that may work for your use case if your existing Pod agenda is a Post Type using Table Storage for meta, not an Advanced Content Type.

To use the command:

• Back up the database. For example, with wp db export > db.sql or with PHPMyAdmin.
• Create a new Pod using Post Meta storage, for example titled agenda_post.
• Create all fields on the new Pod, using the same configuration as agenda. All names should be the same. If there are many fields, it may be faster to use Pods > Components > Import/Export Packages to export a configuration for agenda, edit that text file for the Pod name and storage type, then import as a new Pod.
• Run the command wp pods migrate-to-postmeta --from=agenda --to=agenda_post
• The command expects that fields are the same, and Post Titles are not repeated. If the command is run multiple times, it will skip copying over items with the same Post Title.

<?php
/**
 * Plugin Name: Pods CLI Migrate to Postmeta
 * Description: Migrate a Post Type using Table Storage for meta to a new Pod using postmeta storage. Requires that the new pod has been created, and that all field names and configurations are the same. Skips duplicate titles. Usage: <code>wp pods migrate-to-postmeta --from=pod_name_using_table_storage_for_meta --to=pod_name_using_postmeta</code>
 * Plugin URI: https://wordpress.org/support/topic/set-meta-key-for-a-query-that-is-based-on-a-cpt-stored-in-a-table/
 * Version: 1
 */
add_action(
	'cli_init',
	function() {
		\WP_CLI::add_command(
			'pods migrate-to-postmeta',
			function( $a, $aa ) {
				global $wpdb;

				$from = $aa['from'];
				$to = $aa['to'];

				if ( empty( $to ) || empty( $from ) ) {
					\WP_CLI::log( 'Please set --to post type and --from post type. All fields should already be configured.' );
					exit;
				}

				// Query all the 'from' posts.
				$from_pod = pods(
					$from,
					[
						'limit' => -1,
						'where' => 't.post_status IS NOT NULL',
					]
				);
				// Reference the 'new' Pods post_type object.
				$to_pod = pods( $to );

				// Loop through the 'from' posts.
				while ( $from_pod->fetch() ) {
					// Get field names.
					$fields = $from_pod->fields();
					// Get values for each field.
					$field_values = array_reduce(
						array_keys( $fields ),
						function( $carry, $field_key ) use ( $from_pod, $fields ) {
							// Whether the field is a single value or not.
							$is_singular = ( 'single' === $fields[ $field_key ]->args['pick_format_type'] );
							// Get the field value unless it's ID or post_type.
							$new_field = ( in_array( $field_key, [ 'ID', 'post_type' ] ) )
								? []
								: [ $field_key => $from_pod->field( $field_key, $is_singular, true ) ];
							return array_merge(
								$carry,
								$new_field
							);
						},
						[]
					);
					// Check of a 'to' post already exists with the same title.
					$sql = sprintf(
						"SELECT ID FROM %s WHERE post_title = '%s' AND post_type = '%s'",
						$wpdb->posts,
						esc_sql( $field_values['post_title'] ),
						esc_sql( $to )
					);
					$existing_new_id = (int) $wpdb->get_var( $sql );

					if ( empty( $existing_new_id ) ) {
						// The title does not already exist. Create it.
						$new_id = $to_pod->save( $field_values );
						// Log the new ID and edit link.
						\WP_CLI::log(
							sprintf(
								'Saved new ID %d for 「%s」 at %s',
								$new_id,
								$field_values['post_title'],
								add_query_arg(
									[
										'post' => $new_id,
										'action' => 'edit',
									],
									admin_url( 'post.php' )
								)
							)
						);
					}else {
						// The title already exist. Log the edit link and do nothing.
						\WP_CLI::log(
							sprintf(
								'Skipped existing ID %d for 「%s」 found at %s',
								$existing_new_id,
								$field_values['post_title'],
								add_query_arg(
									[
										'post' => $existing_new_id,
										'action' => 'edit',
									],
									admin_url( 'post.php' )
								)
							)
						);
					}
				}
			}
		);
	}
);