Delete row sig_b92756bbc525 from signals

id sig_b92756bbc525
event_id evt_3e7d1c8f79ee
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_cbb19cedf ...
dedupe_key signal_enriched:news_delta:2c53d8c3f1b9931e
throttle_s 0
created_at 2026-04-17T21:46:24.135264+00:00
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