Delete row sig_99d48d1a7cd8 from signals

id sig_99d48d1a7cd8
event_id evt_c6ca05e7ac73
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_b1ab113ba ...
dedupe_key signal_enriched:news_delta:7ff18d3003499e27
throttle_s 0
created_at 2026-04-10T10:20:38.386177+00:00
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