Delete row sig_b7420cc1a89c from signals

id sig_b7420cc1a89c
event_id evt_a1c6a24310ef
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_8ea7c5e87 ...
dedupe_key signal_enriched:news_delta:16a7c965466a6895
throttle_s 0
created_at 2026-04-20T21:37:11.318929+00:00
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