Delete row sig_1a6a8d9fa64d from signals

id sig_1a6a8d9fa64d
event_id evt_2f25863c5336
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_353e9bde1 ...
dedupe_key signal_enriched:news_delta:f3317963f968e84e
throttle_s 0
created_at 2026-04-19T20:59:44.341213+00:00
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