Delete row sig_392e5cbff631 from signals

id sig_392e5cbff631
event_id evt_8447a02b0381
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_e112a85b5 ...
dedupe_key signal_enriched:news_delta:54be75e8f2ea2565
throttle_s 0
created_at 2026-04-09T10:33:00.493156+00:00
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