古いMastodonサーバだとaccountsテーブルの1番さんが稼動開始時刻に近いと思うんだ
> SELECT created_at,username,domain,actor_type FROM accounts WHERE id=1;
created_at | username | domain | actor_type
----------------------------+----------+--------+------------
2017-04-15 02:47:37.894054 | zundan | | Person
(1 row)
