Delete row sig_9a1fc454e624 from signals

id sig_9a1fc454e624
event_id evt_e46536aa2184
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_c7f03de3f ...
dedupe_key signal_enriched:news_delta:f1001dc892fe2bea
throttle_s 0
created_at 2026-04-21T01:31:11.856861+00:00
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