Delete row sig_2721704451d4 from signals

id sig_2721704451d4
event_id evt_e0fda2f5cd30
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T23:23:32.270130+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:951154fa455c714d
throttle_s 0
created_at 2026-04-07T23:23:32.270130+00:00
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