Initial toot-worker implementation

migrations/0003_perf_indexes.sql

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+CREATE INDEX IF NOT EXISTS idx_statuses_visibility_time ON statuses(visibility, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_statuses_reply_time ON statuses(in_reply_to_id, created_at ASC);
+CREATE INDEX IF NOT EXISTS idx_media_status_time ON media(status_id, created_at ASC);