discard broken sqlite rows

I did some database surgery on my SQLite DB which somehow caused some
rows to be messed up. This change just discords broken rows instead of
panicking, allowing the migration to finish.

tools/iface/src/db/sqlite.rs

@@ -106,9 +106,22 @@ impl SegmentIter for SqliteSegmentIter<'_> {
     fn iter<'f>(&'f mut self) -> KVIter<'f> {
         Box::new(
             self.0
-                .query_map([], |row| Ok((row.get_unwrap(0), row.get_unwrap(1))))
+                .query_map([], |row| Ok((row.get(0), row.get(1))))
                 .unwrap()
-                .map(|r| r.unwrap()),
+                .map(|x| x.unwrap())
+                .filter_map(|(k, v)| {
+                    let Ok(k) = k else {
+                        println!("ignored a row because its key is malformed");
+                        return None;
+                    };
+
+                    let Ok(v) = v else {
+                        println!("ignored a row because its value is malformed");
+                        return None;
+                    };
+
+                    Some((k, v))
+                }),
         )
     }
 }