Delete row sig_5fc1c0369167 from signals

id sig_5fc1c0369167
event_id evt_7704e63f5ced
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_efa7c6b9b ...
dedupe_key signal_enriched:news_delta:da5e5268d7bcc713
throttle_s 0
created_at 2026-04-07T23:23:37.678336+00:00
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