Delete row sig_1f8483dd2b67 from signals

id sig_1f8483dd2b67
event_id evt_a8c244de9059
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_847a5cd60 ...
dedupe_key signal_enriched:news_delta:32ab5bd938a90e1a
throttle_s 0
created_at 2026-04-14T09:18:53.922227+00:00
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