Delete row sig_375395886c89 from signals

id sig_375395886c89
event_id evt_bbe5b0b033b1
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_047faf1ef ...
dedupe_key signal_enriched:news_delta:05a6942f6e84eafc
throttle_s 0
created_at 2026-04-18T13:34:53.653857+00:00
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