Delete row sig_c15947542cf1 from signals

id sig_c15947542cf1
event_id evt_b84f189f4e6a
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_760b044a0 ...
dedupe_key signal_enriched:news_delta:087e7d8ab386de02
throttle_s 0
created_at 2026-04-22T10:14:41.725545+00:00
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