Delete row sig_04e50866f426 from signals

id sig_04e50866f426
event_id evt_9ea2cea43ff5
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_ecba1c797 ...
dedupe_key signal_enriched:news_delta:e2a19701bf4eddac
throttle_s 0
created_at 2026-04-20T10:45:37.722974+00:00
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