Delete row sig_4c90396a8c01 from signals

id sig_4c90396a8c01
event_id evt_172f0763d850
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_442eb01d8 ...
dedupe_key signal_enriched:news_delta:15afdcdefcc2c863
throttle_s 0
created_at 2026-04-09T02:28:00.987275+00:00
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