Delete row sig_a153da8fc020 from signals

id sig_a153da8fc020
event_id evt_b61938c57d59
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_9ad1efb87 ...
dedupe_key signal_enriched:news_delta:04df168e8cc2121c
throttle_s 0
created_at 2026-04-10T06:33:29.354488+00:00
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