Delete row sig_d154c83a741b from signals

id sig_d154c83a741b
event_id evt_b7a35458c8c3
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_87e87e8af ...
dedupe_key signal_enriched:news_delta:bbacab1ae0b0cfa6
throttle_s 0
created_at 2026-04-17T13:27:20.773424+00:00
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