Delete row sig_219df04b6136 from signals

id sig_219df04b6136
event_id evt_1a7506983a28
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_884b2b6dc ...
dedupe_key signal_enriched:news_delta:01d4d3b4b56f8e96
throttle_s 0
created_at 2026-04-21T03:02:40.879641+00:00
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