Delete row sig_a2dfb021c079 from signals

id sig_a2dfb021c079
event_id evt_8b6490559157
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_217c5532d ...
dedupe_key signal_enriched:news_delta:e2f3a620dfb00fd8
throttle_s 0
created_at 2026-04-20T00:47:42.375452+00:00
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