Delete row sig_42985b9306ca from signals

id sig_42985b9306ca
event_id evt_0b5f19e5ae32
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_e016465e8 ...
dedupe_key signal_enriched:news_delta:4f9ceca8fbab9979
throttle_s 0
created_at 2026-04-22T13:02:42.932720+00:00
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