Migrate to Id type

src/data_provider/card_sets.rs

@@ -1,4 +1,4 @@
-use crate::lang::{DeckSettings, OrderMode};
+use crate::lang::{DeckSettings, OrderMode, INVALID_ID};
 
 use rusqlite::Connection;
 
@@ -43,11 +43,11 @@ pub fn add_set(set: &mut DeckSettings, connection: &Connection) {
         )
         .unwrap_or_else(|e| {println!("{}", e); 0});
 
-    set.id = index;
+    set.id = index.into();
 }
 
 pub fn update_card_set(set: &mut DeckSettings, connection: &Connection) {
-    if set.id == 0 {
+    if set.id == INVALID_ID {
         add_set(set, connection);
     } else {
         connection
@@ -66,7 +66,7 @@ pub fn update_card_set(set: &mut DeckSettings, connection: &Connection) {
 }
 
 pub fn delete_set(set: &DeckSettings, connection: &Connection) {
-    if set.id == 0 {
+    if set.id == INVALID_ID {
         return;
     }
     connection