Delete row sig_ed4f2f3b3d97 from signals

id sig_ed4f2f3b3d97
event_id evt_d46e77a724cd
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_8a093ac86 ...
dedupe_key signal_enriched:news_delta:2fab5cb9299e9eb5
throttle_s 0
created_at 2026-04-06T23:19:11.785542+00:00
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