Delete row sig_58d9bf148ee6 from signals

id sig_58d9bf148ee6
event_id evt_ffaca1179b2d
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_5647b80d9 ...
dedupe_key signal_enriched:news_delta:f9c5120cd0bde6d1
throttle_s 0
created_at 2026-04-10T20:14:39.574044+00:00
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