Delete row sig_1a5d8719d49d from signals

id sig_1a5d8719d49d
event_id evt_5cff115265d8
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_01dd25356 ...
dedupe_key signal_enriched:news_delta:3a1bb96ceb48deaa
throttle_s 0
created_at 2026-04-20T04:36:43.980245+00:00
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