Delete row sig_b9334faccd56 from signals

id sig_b9334faccd56
event_id evt_548d6560e5e8
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_9feb3c180 ...
dedupe_key signal_enriched:news_delta:c2ee4529b4da78eb
throttle_s 0
created_at 2026-04-06T20:06:09.559919+00:00
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