Delete row sig_981fb4a78bbc from signals

id sig_981fb4a78bbc
event_id evt_bf8b22613f70
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_5916fce18 ...
dedupe_key signal_enriched:news_delta:b4ade3d55e148934
throttle_s 0
created_at 2026-04-16T15:06:04.730050+00:00
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