Delete row sig_4ebd786112f6 from signals

id sig_4ebd786112f6
event_id evt_78f0d5660bc3
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_e9daadd64 ...
dedupe_key signal_enriched:news_delta:1927c9cdc0c5f1d2
throttle_s 0
created_at 2026-04-21T02:24:00.772982+00:00
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