product_template_multi_link_date_span

Purpose

Allow product template links to stay active only within configurable date windows tied to their link type.

Features

product.template.link: Adds optional start and end dates to each link and recalculates link activity based on the current date when the link type limits by dates.
product.template.link: Prevents links from being saved without a start date when the chosen link type marks that value as mandatory.
product.template.link.type: Introduces settings to determine whether links of the type are date-limited and if a start date must be enforced.
user interface: Shows the date span fields and requirement toggles on link and link type views only when the type configuration makes them applicable.