Delete row sig_519d22f49b7f from signals

id sig_519d22f49b7f
event_id evt_7474281beefd
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_a7ce7ec0f ...
dedupe_key signal_enriched:news_delta:bad3d75fc90ae257
throttle_s 0
created_at 2026-04-07T23:23:39.344374+00:00
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