Delete row sig_40648ca6c9f1 from signals

id sig_40648ca6c9f1
event_id evt_36b2214c7186
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_d16e22c58 ...
dedupe_key signal_enriched:news_delta:2124bc00388212c1
throttle_s 0
created_at 2026-04-16T13:30:15.728178+00:00
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