Delete row sig_d176f44cbc4f from signals

id sig_d176f44cbc4f
event_id evt_369607b30b41
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_aa14d27b5 ...
dedupe_key signal_enriched:news_delta:a34ce10465cc60bb
throttle_s 0
created_at 2026-04-17T04:27:44.047744+00:00
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