Delete row sig_b5bc905c33b1 from signals

id sig_b5bc905c33b1
event_id evt_1c17bde04365
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_db5391b90 ...
dedupe_key signal_enriched:news_delta:7f4659b99327121c
throttle_s 0
created_at 2026-04-09T17:20:48.129822+00:00
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