Delete row sig_d77ed01492fb from signals

id sig_d77ed01492fb
event_id evt_7d73b98e512a
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_9cf649066 ...
dedupe_key signal_enriched:news_delta:0cd98c884a09301d
throttle_s 0
created_at 2026-04-20T10:45:37.997499+00:00
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