Delete row sig_cf630f3ef36b from signals

id sig_cf630f3ef36b
event_id evt_6d06d5cde15a
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_4360a203f ...
dedupe_key signal_enriched:news_delta:26ecf7b53b0b4647
throttle_s 0
created_at 2026-04-22T14:03:33.433678+00:00
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