Delete row sig_18f699951d41 from signals

id sig_18f699951d41
event_id evt_ae534edbb151
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_2e8351e27 ...
dedupe_key signal_enriched:news_delta:b6381d6c2f23b7c7
throttle_s 0
created_at 2026-04-18T02:26:43.839187+00:00
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