Delete row sig_298bcdb8acdb from signals

id sig_298bcdb8acdb
event_id evt_4ce9d7b2c2f5
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_231fba954 ...
dedupe_key signal_enriched:news_delta:211920abe565b812
throttle_s 0
created_at 2026-04-18T05:44:30.154617+00:00
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