Delete row sig_c970e08fc1bd from signals

id sig_c970e08fc1bd
event_id evt_1e3955ba367e
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_f692f3af8 ...
dedupe_key signal_enriched:news_delta:04f6805b92d3023a
throttle_s 0
created_at 2026-04-21T00:02:03.923373+00:00
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