去掉非必要引入。

src/msv.rs

@@ -5,7 +5,6 @@ use rust_decimal::Decimal;
 use rust_decimal::prelude::{FromPrimitive, ToPrimitive};
 use rust_decimal_macros::dec;
 use serde_json::{json, Value};
-use tracing::info;
 use crate::db_connector::{get_depths_json, get_trades_json};
 use crate::params_utils::{get_str, parse_str_to_decimal};
 use crate::server::{Response, SimpleDepth, Trade};