Delete row sig_153ba1c5af30 from signals

id sig_153ba1c5af30
event_id evt_002cbb407666
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_6bea6a43f ...
dedupe_key signal_enriched:news_delta:edddacfa2d98350f
throttle_s 0
created_at 2026-04-10T07:49:15.222215+00:00
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