Delete row sig_754c132962fc from signals

id sig_754c132962fc
event_id evt_35a0a29ff2b0
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_b339fdeec ...
dedupe_key signal_enriched:news_delta:cbdadf24ab50c31c
throttle_s 0
created_at 2026-04-17T22:02:28.778972+00:00
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