Delete row sig_61905a24859b from signals

id sig_61905a24859b
event_id evt_37b154514df9
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_74bbe4c30 ...
dedupe_key signal_enriched:news_delta:481cafe31e04619c
throttle_s 0
created_at 2026-04-14T07:48:04.709048+00:00
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