Delete row sig_f9c503b76bf2 from signals

id sig_f9c503b76bf2
event_id evt_825fce52524b
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_c43190cff ...
dedupe_key signal_enriched:news_delta:8748d22b0b2e9ee1
throttle_s 0
created_at 2026-04-16T05:37:58.720111+00:00
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