Delete row sig_a15a814cbfd6 from signals

id sig_a15a814cbfd6
event_id evt_74a97034b20e
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_0446e33de ...
dedupe_key signal_enriched:news_delta:e0c8d17e33598430
throttle_s 0
created_at 2026-04-11T02:26:10.970273+00:00
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