new struct for invites

server/src/db_io/src/models.rs

@@ -13,3 +13,10 @@ pub struct channels {
     pub name: String,
     pub ctype: i64,
 }
+
+#[derive(Queryable)]
+pub struct Invite {
+    pub hash: i64,
+    pub uses: i32,  // simple that tracks the number of uses a thing has left
+    pub expire: i64, // used as a unix time stamp
+}