Delete row sig_4b26add5fa31 from signals

id sig_4b26add5fa31
event_id evt_a3a37dc2d585
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_96489e5ba ...
dedupe_key signal_enriched:news_delta:ba39f91f09568054
throttle_s 0
created_at 2026-04-11T15:52:30.158065+00:00
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