Delete row sig_0a1dec899ea9 from signals

id sig_0a1dec899ea9
event_id evt_8555562a11a1
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_28f979717 ...
dedupe_key signal_enriched:news_delta:168d41d8eab177f8
throttle_s 0
created_at 2026-04-10T21:57:54.843523+00:00
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