Delete row sig_5fc91c640563 from signals

id sig_5fc91c640563
event_id evt_efeb8bd680c4
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_75e859d41 ...
dedupe_key signal_enriched:news_delta:899c327f199388ce
throttle_s 0
created_at 2026-04-09T09:54:21.153734+00:00
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