Delete row sig_539721fec024 from signals

id sig_539721fec024
event_id evt_0ec0181fcca2
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_601dd3717 ...
dedupe_key signal_enriched:news_delta:210d42983d3fc844
throttle_s 0
created_at 2026-04-17T22:32:36.474440+00:00
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