dbinfer-diginetica: refresh ER schema diagram + dataset card

dbinfer-diginetica/README.md

@@ -13,7 +13,7 @@ Diginetica from the 4DBInfer benchmark: an e-commerce dataset of user browsing a
 
 ![schema diagram](schema.svg)
 
-Open [`schema.svg`](schema.svg) for a zoomable view: each table lists all of its columns and types, with primary keys, foreign keys, and the foreign-key edges between tables.
+Open [`schema.svg`](schema.svg) for a zoomable view: each table shows its columns and types and its row count, with primary keys, foreign keys, time columns, and the foreign-key relationships (crow's-foot notation) between tables.
 
 Splits: validation `2016-11-11 00:00:00`, test `2016-11-12 00:00:00` (rows up to a split's timestamp are the inputs for that split).