Delete row sig_de8cc1a82f77 from signals

id sig_de8cc1a82f77
event_id evt_b6c96e90fc56
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_0562556ed ...
dedupe_key signal_enriched:news_delta:68b04fc97ffb5c5e
throttle_s 0
created_at 2026-04-09T18:49:36.131213+00:00
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