Delete row sig_c3cbb805b5c2 from signals

id sig_c3cbb805b5c2
event_id evt_2a52ce739fbb
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_5b264d072 ...
dedupe_key signal_enriched:news_delta:a6e37c0d9a2812ab
throttle_s 0
created_at 2026-04-22T11:31:53.871432+00:00
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