Delete row sig_ffacecf180ae from signals

id sig_ffacecf180ae
event_id evt_b06bb5c83c3d
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_60641e073 ...
dedupe_key signal_enriched:news_delta:058dfc9862b6982a
throttle_s 0
created_at 2026-04-13T16:18:39.768587+00:00
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