Delete row sig_d2e256a9ae3d from signals

id sig_d2e256a9ae3d
event_id evt_9b8da3a79e3b
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_79953e8b3 ...
dedupe_key signal_enriched:news_delta:ffb31678e446dec1
throttle_s 0
created_at 2026-04-17T20:17:19.338580+00:00
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