Delete row sig_959e89b55947 from signals

id sig_959e89b55947
event_id evt_13eb23d6b555
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_91eb9bcfe ...
dedupe_key signal_enriched:news_delta:d6f84e275f3a89b9
throttle_s 0
created_at 2026-04-17T08:08:32.270056+00:00
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