Delete row sig_98bf5e5156cd from signals

id sig_98bf5e5156cd
event_id evt_d76c4948afc8
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_f8f46c220 ...
dedupe_key signal_enriched:news_delta:44d5db46b9441225
throttle_s 0
created_at 2026-04-08T03:15:56.544048+00:00
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