Delete row sig_c30cd18750b6 from signals

id sig_c30cd18750b6
event_id evt_7413e85aca3b
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_fb118a078 ...
dedupe_key signal_enriched:news_delta:53ebc38f1448883f
throttle_s 0
created_at 2026-04-18T17:12:32.664751+00:00
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