Delete row sig_1ab67ba67795 from signals

id sig_1ab67ba67795
event_id evt_e64a29e2b725
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_7c5e1f96b ...
dedupe_key signal_enriched:news_delta:5ef7600037bf19e0
throttle_s 0
created_at 2026-04-20T19:26:44.271801+00:00
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