Delete row sig_fc2d3302f4f5 from signals

id sig_fc2d3302f4f5
event_id evt_a04976973207
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_04253a92e ...
dedupe_key signal_enriched:news_delta:cfd4bd18eb4a60f8
throttle_s 0
created_at 2026-04-20T02:19:30.633632+00:00
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