Delete row sig_2918adc3ba5e from signals

id sig_2918adc3ba5e
event_id evt_68f631b0921c
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_aa1db474e ...
dedupe_key signal_enriched:news_delta:2460a0dc15d3cdb4
throttle_s 0
created_at 2026-04-16T02:03:48.427252+00:00
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