Delete row sig_ed99c28f8289 from signals

id sig_ed99c28f8289
event_id evt_b97d25d0362d
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_35aa3c980 ...
dedupe_key signal_enriched:news_delta:74a2cd772dd485e5
throttle_s 0
created_at 2026-04-06T19:27:28.056267+00:00
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