Delete row sig_15405ed408e6 from signals

id sig_15405ed408e6
event_id evt_9197b6701b91
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_c6d8d7228 ...
dedupe_key signal_enriched:news_delta:002b8cd352c95a22
throttle_s 0
created_at 2026-04-14T13:40:20.685257+00:00
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