Delete row sig_da3072cfc377 from signals

id sig_da3072cfc377
event_id evt_820da040933d
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_229956ece ...
dedupe_key signal_enriched:news_delta:e262cd83b90977ae
throttle_s 0
created_at 2026-04-10T13:38:20.432182+00:00
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