Delete row sig_a2c861acc876 from signals

id sig_a2c861acc876
event_id evt_f8c224ad2f96
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_7dfa6c62e ...
dedupe_key signal_enriched:news_delta:987aec8c078ca3d4
throttle_s 0
created_at 2026-04-11T22:55:31.887338+00:00
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