Delete row sig_ac618e79b4bf from signals

id sig_ac618e79b4bf
event_id evt_7d464e94cd2d
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_3c191e692 ...
dedupe_key signal_enriched:news_delta:1d61620bfbd3862f
throttle_s 0
created_at 2026-04-06T17:58:09.674602+00:00
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