Delete row sig_759acc6c26df from signals

id sig_759acc6c26df
event_id evt_27beb930f145
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_6b625588a ...
dedupe_key signal_enriched:news_delta:a97cec0d2c68d960
throttle_s 0
created_at 2026-04-19T15:38:58.584990+00:00
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