Delete row sig_60c2a4406638 from signals

id sig_60c2a4406638
event_id evt_149a6be0a1bf
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_f1c5f457d ...
dedupe_key signal_enriched:news_delta:b7407aa4f6614742
throttle_s 0
created_at 2026-04-08T12:09:43.310491+00:00
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