Delete row sig_15bf05c1d15f from signals

id sig_15bf05c1d15f
event_id evt_56758bef2719
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_14b10119b ...
dedupe_key signal_enriched:news_delta:b9da015d1dbab429
throttle_s 0
created_at 2026-04-21T06:10:19.501846+00:00
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