Delete row sig_7619758d09cb from signals

id sig_7619758d09cb
event_id evt_23172cb64b81
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_740b744d0 ...
dedupe_key signal_enriched:news_delta:9b4a4a48a5cdd3fd
throttle_s 0
created_at 2026-04-20T17:14:49.754620+00:00
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