users: store timezone, default is "UTC"

crates/database/src/tables/users.rs

@@ -16,6 +16,7 @@ pub struct Users {
     pub password_recover: Option<String>,
     pub paper_key: Option<String>,
     pub is_archived: bool,
+    pub timezone: String,
 }
 
 impl Users {
@@ -163,4 +164,18 @@ impl Users {
 
         Ok((query.rows_affected() == 1).then_some(()))
     }
+
+    pub async fn set_timezone(
+        conn: impl SqliteExecutor<'_>,
+        id: &str,
+        timezone: &str,
+    ) -> Result<Option<()>, Error> {
+        let query: SqliteQueryResult =
+            sqlx::query_file!("queries/users/set_timezone.sql", timezone, id)
+                .execute(conn)
+                .await
+                .map_err(handle_error)?;
+
+        Ok((query.rows_affected() == 1).then_some(()))
+    }
 }