Delete row sig_42fcfbbe5091 from signals

id sig_42fcfbbe5091
event_id evt_a19601647c9b
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_503633a6e ...
dedupe_key signal_enriched:news_delta:dfce3fa2d9efceb9
throttle_s 0
created_at 2026-04-08T11:43:27.582006+00:00
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