Delete row sig_2bbd71d6567c from signals

id sig_2bbd71d6567c
event_id evt_907eb5464d31
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_77cdef8dd ...
dedupe_key signal_enriched:news_delta:1ab1b738ab0e9c11
throttle_s 0
created_at 2026-04-09T02:28:01.742263+00:00
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