Delete row sig_4a9c75f977b0 from signals

id sig_4a9c75f977b0
event_id evt_c8f1e65598b1
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_19cc76a60 ...
dedupe_key signal_enriched:news_delta:7656c8688ec6a9e1
throttle_s 0
created_at 2026-04-19T19:30:21.217194+00:00
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