Extraneous civicrm_price_set_entity rows created when submitting online contribution / membership signups

My understanding is that the purpose of the price_set_entity table is to link online contribution pages to price sets, and events to price sets. The sample data properly contains rows which do this for the 3 sample online contribution pages, and the 3 sample events.

However, I am seeing sample data rows AND new rows created in this table linking price sets to specific contribution records. I don't understand why this would be needed - AND the insert behavior is inconsistent. If there's some reason we need these entries in price_set_entity - let's discuss please.

BUG 1: There are additional entries in the sample data linking price set 1 to each of the 13 sample contribution records.

BUG 2: When I make an online contribution (using sample contribution pages) - a new row is inserted in civicrm_price_set_entity linking the contribution page's price set to the contribution. Why is this needed? Note that rows are NOT inserted into this table for any of these other actions:

• offline contribution (quick config)
• online event registration (quick config)
• offline event registration (quick config)
• online or offline event registration (explicit price set)