prepare to remove old log, in favor of activities

src/model/activity.rs

@@ -1,7 +1,7 @@
 use std::ops::DerefMut;
 
 use super::{role::Role, user::User};
-use chrono::{DateTime, Local, NaiveDateTime, TimeZone, Utc};
+use chrono::{DateTime, Duration, Local, NaiveDateTime, TimeZone, Utc};
 use serde::{Deserialize, Serialize};
 use sqlx::{FromRow, Sqlite, SqlitePool, Transaction};
 
@@ -46,6 +46,15 @@ impl ActivityBuilder {
         }
     }
 
+    #[must_use]
+    pub fn keep_until_days(self, days: i64) -> Self {
+        let now = Utc::now().naive_utc();
+        Self {
+            keep_until: Some(now + Duration::days(days)),
+            ..self
+        }
+    }
+
     pub async fn save(self, db: &SqlitePool) {
         Activity::create(db, &self.text, &self.relevant_for, self.keep_until).await;
     }