Delete row sig_f95aa456cc9c from signals

id sig_f95aa456cc9c
event_id evt_e8de4f52f706
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_19e6de192 ...
dedupe_key signal_enriched:news_delta:7dac22370c564ea3
throttle_s 0
created_at 2026-04-18T04:59:06.885409+00:00
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