Has a Bundesliga game ever ended 7-1?
It has. 7-1 has been a Bundesliga final 29 times in 18,874 games. The first was TSV 1860 Munchen beat 1. FC Saarbrucken on November 9, 1963; the latest was 1. FC Koln beat Werder Bremen on January 21, 2023.
That makes 7-1 the 24th most common final score out of 45 that have ever occurred in Bundesliga. One point away, 8-1 has happened 8 times and 7-2 has happened 17 times.