Delete row sig_da26ca0db5dd from signals

id sig_da26ca0db5dd
event_id evt_56d1defca86d
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_94d81c98c ...
dedupe_key signal_enriched:news_delta:d9e64a83d8c9be23
throttle_s 0
created_at 2026-04-07T05:08:56.500896+00:00
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