Delete row sig_ca0b28e456fa from signals

id sig_ca0b28e456fa
event_id evt_1ed94d09dceb
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_95d26147d ...
dedupe_key signal_enriched:news_delta:b867f1dc1c7f8419
throttle_s 0
created_at 2026-04-13T08:10:29.821138+00:00
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