Delete row sig_c2589850aabd from signals

id sig_c2589850aabd
event_id evt_68de9f141dbb
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_e3e6feb2d ...
dedupe_key signal_enriched:news_delta:247999645d4810f9
throttle_s 0
created_at 2026-04-09T09:02:14.652009+00:00
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