Delete row sig_d9230c2d0045 from signals

id sig_d9230c2d0045
event_id evt_ed4c7576b368
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_eebf4d938 ...
dedupe_key signal_enriched:news_delta:c3d90d0a9095c50f
throttle_s 0
created_at 2026-04-21T04:05:36.903524+00:00
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