Delete row sig_d14345cf5c4c from signals

id sig_d14345cf5c4c
event_id evt_9dcba5e7f0b5
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_57fb165db ...
dedupe_key signal_enriched:news_delta:3c2afb32eb2a0001
throttle_s 0
created_at 2026-04-14T21:04:45.298778+00:00
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