Delete row sig_3564692963a3 from signals

id sig_3564692963a3
event_id evt_006fe4a4bece
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_38f60d425 ...
dedupe_key signal_enriched:news_delta:c9addfc393ae29d5
throttle_s 0
created_at 2026-04-04T02:10:23.449545+00:00
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