Delete row sig_430ee3852797 from signals

id sig_430ee3852797
event_id evt_89f29564424e
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T21:37:07.434719+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:ce23d57fd30f471d
throttle_s 0
created_at 2026-04-20T21:37:07.434719+00:00
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