Delete row sig_3db1f669a6e8 from signals

id sig_3db1f669a6e8
event_id evt_037b5e40f480
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_a21211d5f ...
dedupe_key signal_enriched:news_delta:517d587b68acf010
throttle_s 0
created_at 2026-04-21T16:42:29.526103+00:00
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