finish backend tests of new db layout

src/model/log.rs

@@ -1,6 +1,6 @@
 use chrono::{DateTime, Local, NaiveDateTime, TimeZone, Utc};
 use serde::{Deserialize, Serialize};
-use sqlx::{FromRow, SqlitePool};
+use sqlx::{FromRow, Sqlite, SqlitePool, Transaction};
 
 #[derive(FromRow, Debug, Serialize, Deserialize)]
 pub struct Log {
@@ -15,6 +15,12 @@ impl Log {
             .await
             .is_ok()
     }
+    pub async fn create_with_tx(db: &mut Transaction<'_, Sqlite>, msg: String) -> bool {
+        sqlx::query!("INSERT INTO log(msg) VALUES (?)", msg,)
+            .execute(db)
+            .await
+            .is_ok()
+    }
 
     async fn last(db: &SqlitePool) -> Vec<Log> {
         sqlx::query_as!(