Delete row sig_20616c472f0a from signals

id sig_20616c472f0a
event_id evt_23f9f8a34dcd
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_5b26e1bf6 ...
dedupe_key signal_enriched:news_delta:707a11e351c27e11
throttle_s 0
created_at 2026-04-09T18:49:36.422008+00:00
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