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table! {
    sessions (key) {
        key -> Varchar,
        user_id -> Int4,
    }
}

table! {
    users (id) {
        id -> Int4,
        username -> Varchar,
    }
}

joinable!(sessions -> users (user_id));

allow_tables_to_appear_in_same_query!(
    sessions,
    users,
);