Delete row sig_3b775143c3e4 from signals

id sig_3b775143c3e4
event_id evt_539e30925ca4
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_bba59abaf ...
dedupe_key signal_enriched:news_delta:2f96cb67a3cf9fb6
throttle_s 0
created_at 2026-04-08T19:34:52.527745+00:00
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