Delete row sig_5a3a70833644 from signals

id sig_5a3a70833644
event_id evt_f56ca347173e
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_a276cd14b ...
dedupe_key signal_enriched:news_delta:965eed3c5fb40b4e
throttle_s 0
created_at 2026-04-21T00:02:03.629362+00:00
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