Delete row sig_2f5bf82f8be7 from signals

id sig_2f5bf82f8be7
event_id evt_05175a5c1289
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_d7a7d89ff ...
dedupe_key signal_enriched:news_delta:0b2a181c1426cee7
throttle_s 0
created_at 2026-04-13T11:10:14.193689+00:00
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