Delete row sig_98ff20d6d6b3 from signals

id sig_98ff20d6d6b3
event_id evt_94a0ce52f73b
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_384d18e1a ...
dedupe_key signal_enriched:news_delta:868bf4af68912603
throttle_s 0
created_at 2026-04-18T07:45:38.637049+00:00
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