Within a Rails project, use the command Show Rails Schema to open a new activitybar panel with all the DB tables in the db/schema.rb file.
If the command is triggered from a Rails Model, it will automatically expand that especific table in the tree view showing the related column's names and types. On hover, each column will show as a tooltip the related comments, for now, this is only at the column level.
From the list of DB tables on the Rails Schema activitybar, on hover, there's a Open in Schema button that will open the db/schema.rb file and center the block related to that specific table.