Delete row sig_31a01a115cbc from signals

id sig_31a01a115cbc
event_id evt_8307ec5cc01c
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_f6b2fef68 ...
dedupe_key signal_enriched:news_delta:96a65a7fd91d9280
throttle_s 0
created_at 2026-04-20T05:38:20.650249+00:00
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