Delete row sig_e557a3058f65 from signals

id sig_e557a3058f65
event_id evt_dbc5fb543343
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-10T01:01:02.340924+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:c5d23ce1dffd5dbe
throttle_s 0
created_at 2026-04-10T01:01:02.340924+00:00
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