Delete row sig_ef5e4096f528 from signals

id sig_ef5e4096f528
event_id evt_6f51fc7670d4
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_41ff5dcdc ...
dedupe_key signal_enriched:news_delta:fe33d08bda180881
throttle_s 0
created_at 2026-04-08T00:10:40.791847+00:00
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