Delete row sig_419431b9a951 from signals

id sig_419431b9a951
event_id evt_848e553fdec1
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_be6001165 ...
dedupe_key signal_enriched:news_delta:62ee69dc51528c87
throttle_s 0
created_at 2026-04-18T20:11:34.163654+00:00
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