Delete row sig_5b5c9f7ee511 from signals

id sig_5b5c9f7ee511
event_id evt_4573bc979ccd
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_a3648a6b5 ...
dedupe_key signal_enriched:news_delta:fbef5309e078fc41
throttle_s 0
created_at 2026-04-13T12:39:41.765449+00:00
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