Looking at fares on this route on bahn.de, which I can buy on the website since the train passes through and stops in Germany. There is a direct train departing at 8:02. The Sparangebote prices in February are lowest on Thursday's (€79,90 on Feb. 1, 8, and 15), slightly higher on Wednesdays (€89,90 on Feb. 7 and 14), and much higher on Tuesdays and Fridays ( Feb. 6, 9, and 16 are the dates I checked.)
Anybody know if this pattern is consistent? And why? It actually works out well for us, as we will be traveling this route on a Thursday, but in July not February.
Also, how far in advance are the Sparangebote prices released?