Delete row sig_20310ce7b739 from signals

id sig_20310ce7b739
event_id evt_26af2507b38e
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_8e4cbd7f0 ...
dedupe_key signal_enriched:news_delta:6bd344b9173ac5ff
throttle_s 0
created_at 2026-04-16T13:45:43.634527+00:00
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