Delete row sig_4fa3b563977e from signals

id sig_4fa3b563977e
event_id evt_6cdd525362aa
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_bb5ac80ea ...
dedupe_key signal_enriched:news_delta:e72fdaed85c6dea6
throttle_s 0
created_at 2026-04-19T20:09:57.961799+00:00
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