Delete row sig_8442610ead55 from signals

id sig_8442610ead55
event_id evt_a3b26bdbccf2
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_bff8813ad ...
dedupe_key signal_enriched:news_delta:f882341a5b8e1857
throttle_s 0
created_at 2026-04-17T07:28:43.987561+00:00
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