Allow notifications to be sent days ahead of time

src/db.rs

@@ -13,6 +13,7 @@ pub struct DbChat {
 	last_reminder: Option<i64>,
 	pinned_message: Option<i32>,
 	locale: Option<String>,
+	remind_days_ahead: i64,
 }
 
 pub struct ChatInfo<Tz: TimeZone> {
@@ -22,6 +23,7 @@ pub struct ChatInfo<Tz: TimeZone> {
 	pub last_reminder: Option<DateTime<Tz>>,
 	pub pinned_message_id: Option<i32>,
 	pub locale: String,
+	pub remind_days_ahead: u64,
 }
 
 impl From<DbChat> for ChatInfo<Utc> {
@@ -41,6 +43,8 @@ impl From<DbChat> for ChatInfo<Utc> {
 
 		let locale = db_chat.locale.unwrap_or("de".into());
 
+		let remind_days_ahead = db_chat.remind_days_ahead.try_into().unwrap_or(0);
+
 		ChatInfo {
 			id: db_chat.telegram_id,
 			calendar: db_chat.calendar,
@@ -48,6 +52,7 @@ impl From<DbChat> for ChatInfo<Utc> {
 			last_reminder,
 			pinned_message_id: db_chat.pinned_message,
 			locale,
+			remind_days_ahead,
 		}
 	}
 }