Delete row sig_9e2b3b3a6dda from signals

id sig_9e2b3b3a6dda
event_id evt_b20fa9497a0a
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_3cd357852 ...
dedupe_key signal_enriched:news_delta:5f47e7973656abf1
throttle_s 0
created_at 2026-04-19T03:40:38.574986+00:00
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