How does the Shopify Omnibus Insight: Price History app handle price increases and show the lowest price in the last X days?
When you permanently increase the prices of your products, the Omnibus Insight: Price History app records the lowest price from the past X days, excluding the most recent price change. As a result, the initial price might still be shown as the lowest. The data will automatically refresh with the next price change to reflect the lowest price within the selected timeframe.

According to the Omnibus Directive Article 6a, any announcement of a price reduction shall indicate the prior price applied by the trader for a determined period of time
prior to the application of the price reduction. The prior price means the lowest price applied by the trader during a period of time not shorter than 30 days prior to the
application of the price reduction.
You can customize the period for price tracking. Simply go to the Omnibus Insight: Price Tracker, navigate to Settings, and adjust the Duration Settings as needed.
For example, here is the widget before the first price change:
The price in the widget will update only after the second next price change: