Delete row sig_c130cf459ae3 from signals

id sig_c130cf459ae3
event_id evt_db75f977210a
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_5138dc09e ...
dedupe_key signal_enriched:news_delta:8d163081c30ff7e7
throttle_s 0
created_at 2026-04-19T22:31:26.474739+00:00
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