Delete row sig_747fc45a16f7 from signals

id sig_747fc45a16f7
event_id evt_ee352ae81f71
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_22343cce3 ...
dedupe_key signal_enriched:news_delta:dc1aef537d525383
throttle_s 0
created_at 2026-04-08T20:43:08.238197+00:00
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