Delete row sig_7e1767879631 from signals

id sig_7e1767879631
event_id evt_b18846703ee0
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_96d49a6f5 ...
dedupe_key signal_enriched:news_delta:458eef68b9a236df
throttle_s 0
created_at 2026-04-19T17:09:55.803631+00:00
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