Delete row sig_b93156fa38eb from signals

id sig_b93156fa38eb
event_id evt_52b4e461269e
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_deb52a4d9 ...
dedupe_key signal_enriched:news_delta:b419438d86bd8569
throttle_s 0
created_at 2026-04-17T14:58:09.890237+00:00
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