interest_rate: slr:geschenksparkonto:credit

One row per interest rate. rate_type matches product category per atom #316 (mortgage_rate, consumer_credit, overdraft, credit, savings_rate, leasing_rate, penalty). snapshot_date is when we observed the rate; valid_from is when the bank declared it effective.

This data as json

id	product_id	bank_id	rate_type	rate	tier_floor	tier_ceiling	tenor_months	currency	snapshot_date	valid_from	note	source_document_id
slr:geschenksparkonto:credit	slr:geschenksparkonto	slr	credit	0.1				CHF	2026-06-09	2026-01-01