Function maybe_add_from_param

src/sql.rs:1112–1139

(
    sql: &Sql,
    files_in_use: &mut HashSet<String>,
    query: &str,
    param_id: Param,
)

}

async fn maybe_add_from_param(
    sql: &Sql,
    files_in_use: &mut HashSet<String>,
    query: &str,
    param_id: Param,
) -> Result<()> {
    sql.query_map(
        query,
        (),
        |row| {
            let row: String = row.get(0)?;
            Ok(row)
        },
        |rows| {
            for row in rows {
                let param: Params = row?.parse().unwrap_or_default();
                if let Some(file) = param.get(param_id) {
                    maybe_add_file(files_in_use, file);
                }
            }
            Ok(())
        },
    )
    .await
    .context(format!("housekeeping: failed to add_from_param {query}"))?;

    Ok(())
}

/// Removes from the database stale locally deleted messages that also don't
/// have a server UID.