Delete row sig_3f1656e4fc7b from signals

id sig_3f1656e4fc7b
event_id evt_ca15a493ea9e
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_f0a6ecf9a ...
dedupe_key signal_enriched:news_delta:7f7fd686e3a62890
throttle_s 0
created_at 2026-04-22T04:11:05.898376+00:00
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