Delete row sig_b42aa1e5fbfd from signals

id sig_b42aa1e5fbfd
event_id evt_9f148c1c987c
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_dd1840758 ...
dedupe_key signal_enriched:news_delta:b8fa73ce6bf7b28c
throttle_s 0
created_at 2026-04-07T01:06:12.597112+00:00
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