Delete row sig_3441b3642607 from signals

id sig_3441b3642607
event_id evt_7783350ba64a
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_b1bec9609 ...
dedupe_key signal_enriched:news_delta:930baf2ddc4377bc
throttle_s 0
created_at 2026-04-08T19:34:52.231840+00:00
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