use uniqueness for complete db check

corrlib/integrity.py

@@ -26,6 +26,10 @@ def are_keys_unique(db: Path, table: str, col: str) -> bool:
 
 def check_db_integrity(path: Path) -> None:
     db = get_db_file(path)
+
+    if not are_keys_unique(db, 'backlogs', 'path'):
+        raise Exception("The paths the backlog table of the database links are not unique.")
+
     search_expr = "SELECT * FROM 'backlogs'"
     conn = sqlite3.connect(db)
     results = pd.read_sql(search_expr, conn)