Here’s the query that gets the date:
result = DB.query_single <<~SQL
SELECT created_at
FROM schema_migration_details
ORDER BY created_at
LIMIT 1
SQL
If you’re self-hosted, there should be a way to update the earliest created_at item in that table with some other date. Writing the query is left as an exercise to the ready.
Don't try this at home
DB.query_single("UPDATE schema_migration_details set created_at = '2010-01-01' where id=1")