Delete row sig_13cd389004ac from signals

id sig_13cd389004ac
event_id evt_a56d78d96287
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_d02338b83 ...
dedupe_key signal_enriched:news_delta:e5571191cd9346fe
throttle_s 0
created_at 2026-04-20T17:59:52.276459+00:00
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