Delete row sig_ed445e28d987 from signals

id sig_ed445e28d987
event_id evt_849da7dc74b5
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_c90e47026 ...
dedupe_key signal_enriched:news_delta:5351237c0223367f
throttle_s 0
created_at 2026-04-20T03:35:20.482446+00:00
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