Delete row sig_9818f227c150 from signals

id sig_9818f227c150
event_id evt_015d8408938f
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_cf1fb7319 ...
dedupe_key signal_enriched:news_delta:32d81fb401cb987b
throttle_s 0
created_at 2026-04-03T22:00:49.981285+00:00
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