Delete row sig_375bd222de84 from signals

id sig_375bd222de84
event_id evt_b70af886c39f
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_937024efd ...
dedupe_key signal_enriched:news_delta:987edd20af444af2
throttle_s 0
created_at 2026-04-06T16:28:36.653720+00:00
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