Delete row sig_2b1972df2517 from signals

id sig_2b1972df2517
event_id evt_ecbdfb09924b
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_7d8cbabab ...
dedupe_key signal_enriched:news_delta:38d8c2c8fa91a55f
throttle_s 0
created_at 2026-04-16T16:36:23.999173+00:00
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