Delete row sig_d34d04406496 from signals

id sig_d34d04406496
event_id evt_f9771ee7e1df
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_54f6dfce1 ...
dedupe_key signal_enriched:news_delta:2d3e7ace0ec19f11
throttle_s 0
created_at 2026-04-20T05:53:30.164104+00:00
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