Function get_recent 

pub(crate) async fn get_recent(
    pool: &PgPool,
    since: DateTime<Utc>,
    limit: i64,
) -> Result<Vec<ActivityRow>, Error>

Returns recent activity across all reflectors since the given timestamp.

Results are ordered by observed_at DESC (most recent first) and capped at limit rows. Used by the HTTP API to serve the global activity feed (GET /api/activity).

Errors

Returns sqlx::Error on query failure.