Delete row sig_b23c2d43107b from signals

id sig_b23c2d43107b
event_id evt_f7acff473fcb
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_75acbd2cb ...
dedupe_key signal_enriched:news_delta:f2fcf0639ead8aac
throttle_s 0
created_at 2026-04-10T07:18:58.670606+00:00
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