Delete row sig_9e806e4f4973 from signals

id sig_9e806e4f4973
event_id evt_3ae25d327cd6
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_0eb054dd7 ...
dedupe_key signal_enriched:news_delta:d4797e56bdc60687
throttle_s 0
created_at 2026-04-13T21:08:58.086778+00:00
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