Delete row sig_f30592b5f93f from signals

id sig_f30592b5f93f
event_id evt_c62192d3b87e
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_ae3b1b53a ...
dedupe_key signal_enriched:news_delta:d29596ec2fe43ac6
throttle_s 0
created_at 2026-04-17T02:58:03.978380+00:00
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