Delete row sig_15a9df754c5a from signals

id sig_15a9df754c5a
event_id evt_3f09bf43871a
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_7170ab354 ...
dedupe_key signal_enriched:news_delta:48513076e489d6e0
throttle_s 0
created_at 2026-04-17T05:58:31.801059+00:00
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