Delete row sig_86047a337908 from signals

id sig_86047a337908
event_id evt_100a52335cca
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_00607b84a ...
dedupe_key signal_enriched:news_delta:c423f2782f39da40
throttle_s 0
created_at 2026-04-19T07:31:03.634552+00:00
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