Delete row sig_990486688972 from signals

id sig_990486688972
event_id evt_aa8336a8cfac
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_eabf2bf13 ...
dedupe_key signal_enriched:news_delta:f25c3fa0583dd2f5
throttle_s 0
created_at 2026-04-07T00:26:15.574080+00:00
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