Delete row sig_db9ea73836ec from signals

id sig_db9ea73836ec
event_id evt_a50647a3e32e
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_9bf27f334 ...
dedupe_key signal_enriched:news_delta:8e790f69b9ff56cf
throttle_s 0
created_at 2026-04-07T04:04:22.064106+00:00
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