Visible Alpha data: Now set the Exabel "known time" of each data point to be the Visible Alpha
"revision date", which is the date on which brokers publish their estimates. This ensures that
Exabel represents Visible Alpha data exactly as presented in their terminal. Previously, the Exabel
"known time" was set as the publish time on the Visible Alpha feed. However, this introduced data
issues when Visible Alpha restate / correct their data, such that the publish time no longer
reflects when the broker estimates were actually revised.