Delete row sig_42885bc0aaa1 from signals

id sig_42885bc0aaa1
event_id evt_2d119fdacb21
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_87816ebb5 ...
dedupe_key signal_enriched:news_delta:7ff099a19782ff32
throttle_s 0
created_at 2026-04-20T05:07:23.048146+00:00
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