Delete row sig_fdb54d9cc700 from signals

id sig_fdb54d9cc700
event_id evt_379ac56778a2
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_efb841b02 ...
dedupe_key signal_enriched:news_delta:d98236b91c3eb890
throttle_s 0
created_at 2026-04-21T06:10:19.050577+00:00
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