Delete row sig_dad1921792ec from signals

id sig_dad1921792ec
event_id evt_2dfa67105132
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_b1a7a8982 ...
dedupe_key signal_enriched:news_delta:3c95f50e35657b77
throttle_s 0
created_at 2026-04-06T22:29:24.101980+00:00
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