def METHOD_NAME(db_name: str, room_id: str, file_prefix: str, limit: int) -> None:
    """
    Generate a dot and SVG file for a graph of events in the room based on the
    topological ordering by reading from a Synapse SQLite database.
    """
    conn = sqlite3.connect(db_name)
    sql = "SELECT room_version FROM rooms WHERE room_id = ?"
    c = conn.execute(sql, (room_id,))
    room_version = KNOWN_ROOM_VERSIONS[c.fetchone()[0]]
    sql = (
        "SELECT json, internal_metadata FROM event_json as j "
        "INNER JOIN events as e ON e.event_id = j.event_id "
        "WHERE j.room_id = ?"
    )
    args = [room_id]
    if limit:
        sql += " ORDER BY topological_ordering DESC, stream_ordering DESC LIMIT ?"
        args.append(limit)
    c = conn.execute(sql, args)
    events = [
        make_event_from_dict(json.loads(e[0]), room_version, json.loads(e[1]))
        for e in c.fetchall()
    ]
    events.sort(key=lambda e: e.depth)
    node_map = {}
    state_groups = {}
    graph = pydot.Dot(graph_name="Test")
    for event in events:
        c = conn.execute(
            "SELECT state_group FROM event_to_state_groups WHERE event_id = ?",
            (event.event_id,),
        )
        res = c.fetchone()
        state_group = res[0] if res else None
        if state_group is not None:
            state_groups.setdefault(state_group, []).append(event.event_id)
        t = datetime.datetime.fromtimestamp(
            float(event.origin_server_ts) / 1000
        ).strftime("%Y-%m-%d %H:%M:%S,%f")
        content = json.dumps(unfreeze(event.get_dict()["content"]))
        label = (
            "<"
            "<b>%(name)s </b><br/>"
            "Type: <b>%(type)s </b><br/>"
            "State key: <b>%(state_key)s </b><br/>"
            "Content: <b>%(content)s </b><br/>"
            "Time: <b>%(time)s </b><br/>"
            "Depth: <b>%(depth)s </b><br/>"
            "State group: %(state_group)s<br/>"
            ">"
        ) % {
            "name": event.event_id,
            "type": event.type,
            "state_key": event.get("state_key", None),
            "content": html.escape(content, quote=True),
            "time": t,
            "depth": event.depth,
            "state_group": state_group,
        }
        node = pydot.Node(name=event.event_id, label=label)
        node_map[event.event_id] = node
        graph.add_node(node)
    for event in events:
        for prev_id in event.prev_event_ids():
            try:
                end_node = node_map[prev_id]
            except Exception:
                end_node = pydot.Node(name=prev_id, label=f"<<b>{prev_id}</b>>")
                node_map[prev_id] = end_node
                graph.add_node(end_node)
            edge = pydot.Edge(node_map[event.event_id], end_node)
            graph.add_edge(edge)
    for group, event_ids in state_groups.items():
        if len(event_ids) <= 1:
            continue
        cluster = pydot.Cluster(str(group), label=f"<State Group: {str(group)}>")
        for event_id in event_ids:
            cluster.add_node(node_map[event_id])
        graph.add_subgraph(cluster)
    graph.write("%s.dot" % file_prefix, format="raw", prog="dot")
    graph.write_svg("%s.svg" % file_prefix, prog="dot")