Delete row sig_98de4bbc9673 from signals

id sig_98de4bbc9673
event_id evt_bf04fad45ef0
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_71e56186d ...
dedupe_key signal_enriched:news_delta:64ee3857400328eb
throttle_s 0
created_at 2026-04-16T15:06:04.759611+00:00
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