Delete row sig_a2c837f3dfc5 from signals

id sig_a2c837f3dfc5
event_id evt_55c54c24c447
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_100f113d3 ...
dedupe_key signal_enriched:news_delta:6a4527e051b1ad95
throttle_s 0
created_at 2026-04-09T10:33:00.655298+00:00
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