Delete row sig_f5db548c8538 from signals

id sig_f5db548c8538
event_id evt_5196a7453f8a
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_02014f150 ...
dedupe_key signal_enriched:news_delta:9de2931b0c496f64
throttle_s 0
created_at 2026-04-06T16:28:37.119972+00:00
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