Delete row sig_fffc0ffaa4ad from signals

id sig_fffc0ffaa4ad
event_id evt_fcbc9e5eb31f
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_a6d81c4bf ...
dedupe_key signal_enriched:news_delta:e9bf138c771be720
throttle_s 0
created_at 2026-04-17T02:58:04.008971+00:00
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