Delete row sig_34683946a5cb from signals

id sig_34683946a5cb
event_id evt_0de1b3efaa09
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_6710fac1d ...
dedupe_key signal_enriched:news_delta:f61b789b144c8f86
throttle_s 0
created_at 2026-04-08T06:51:21.956090+00:00
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