Delete row sig_8d531f15213f from signals

id sig_8d531f15213f
event_id evt_9120a00033d6
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_5534b6b7b ...
dedupe_key signal_enriched:news_delta:46ed3c6ceab3be84
throttle_s 0
created_at 2026-04-12T05:49:12.181291+00:00
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