Clean up code

Clean up warnings on newer Rust versions. Drop some no-longer used
tables and columns

src/web/ip_blocking.rs

@@ -42,7 +42,7 @@ impl IpBlocking {
     fn contains<I: Into<u32>>(&self, ip: I) -> bool {
         let ip: u32 = ip.into();
 
-        let mut prev_index = self.upper_ips.len() - 1;
+        let _prev_index = self.upper_ips.len() - 1;
         let mut index = self.upper_ips.len() / 2;
         loop {
             if self.upper_ips[index] <= ip && self.lower_ips[index] >= ip {