Delete row sig_2b71b5d33320 from signals

id sig_2b71b5d33320
event_id evt_c2eae4a8f6f1
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_5633f1ecd ...
dedupe_key signal_enriched:news_delta:f93a0cf5f7867ecd
throttle_s 0
created_at 2026-04-19T23:32:01.709925+00:00
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