Delete row sig_19de4d8757fa from signals

id sig_19de4d8757fa
event_id evt_85740bb04d63
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_b3777d818 ...
dedupe_key signal_enriched:news_delta:2bdcde7a930ba48d
throttle_s 0
created_at 2026-04-08T11:09:50.771222+00:00
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