Delete row sig_1624cfec978b from signals

id sig_1624cfec978b
event_id evt_376ff031ef57
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_b639f5cdd ...
dedupe_key signal_enriched:news_delta:eb8466f6c5b01723
throttle_s 0
created_at 2026-04-06T15:00:06.752312+00:00
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