Delete row sig_158e7f2ef4f8 from signals

id sig_158e7f2ef4f8
event_id evt_9d16d5ad0800
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_655a0c8a2 ...
dedupe_key signal_enriched:news_delta:6665629264cab867
throttle_s 0
created_at 2026-04-20T19:26:44.313566+00:00
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