So the site started working again.
Hook: wc_update_product_lookup_tables_column
Status: In-progress
Argument: ‘column’ => ‘onsale’
Group: wc_update_product_lookup_tables
Recurrence: Non-repeating
Scheduled Date: 2020-01-02 10:43:51 +0000 (1 day 2 hours ago)
Log: 2020-01-02 10:43:43 +0000
action created
2020-01-02 10:56:05 +0000
action started
There is also another one of those in “in-progress” from today. As well as “‘update_callback’ => ‘wc_update_340_state'”.