Delete row sig_18ae16a9d570 from signals

id sig_18ae16a9d570
event_id evt_aa86ec64827c
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_191572430 ...
dedupe_key signal_enriched:news_delta:d85a4eab7688aea3
throttle_s 0
created_at 2026-04-10T20:50:30.436628+00:00
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