Delete row sig_42801e9aa610 from signals

id sig_42801e9aa610
event_id evt_c6471342e575
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_a3383f882 ...
dedupe_key signal_enriched:news_delta:ff149c0395301b8f
throttle_s 0
created_at 2026-04-17T21:07:05.548965+00:00
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