Delete row sig_958541e38acc from signals

id sig_958541e38acc
event_id evt_e31489546cc9
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_8620c4bc7 ...
dedupe_key signal_enriched:news_delta:b758095be5dbee1c
throttle_s 0
created_at 2026-04-19T09:39:51.538324+00:00
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