Delete row sig_588f13ed829b from signals

id sig_588f13ed829b
event_id evt_f096a1246a28
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_79b417e20 ...
dedupe_key signal_enriched:news_delta:0cb7c041e3556284
throttle_s 0
created_at 2026-04-18T17:12:33.267428+00:00
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