Delete row sig_e3f2df36f3bc from signals

id sig_e3f2df36f3bc
event_id evt_717275469c76
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_765a30447 ...
dedupe_key signal_enriched:news_delta:226e4e721d552330
throttle_s 0
created_at 2026-04-07T05:08:56.930896+00:00
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