Delete row sig_9aaaef17ee8f from signals

id sig_9aaaef17ee8f
event_id evt_19750b5fecba
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_a9781246b ...
dedupe_key signal_enriched:news_delta:5761afc8034ebdd8
throttle_s 0
created_at 2026-04-19T20:09:57.760504+00:00
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