Delete row sig_9b452c1614a6 from signals

id sig_9b452c1614a6
event_id evt_bad4a1b31b11
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_82efa4100 ...
dedupe_key signal_enriched:news_delta:cb5f7ef880943d7f
throttle_s 0
created_at 2026-04-17T11:58:30.905618+00:00
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