Delete row sig_016ac7d2fff5 from signals

id sig_016ac7d2fff5
event_id evt_30f2518372d1
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_09b78d7f6 ...
dedupe_key signal_enriched:news_delta:5665157c38566143
throttle_s 0
created_at 2026-04-18T16:34:30.000768+00:00
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