Delete row sig_d42cbf5cf3c3 from signals

id sig_d42cbf5cf3c3
event_id evt_7793c5efb49e
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T11:15:33.613652+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:51f45c6005082862
throttle_s 0
created_at 2026-04-07T11:15:33.613652+00:00
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