Delete row sig_7bd312914a12 from signals

id sig_7bd312914a12
event_id evt_868d8ad757a1
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_4bd44d94c ...
dedupe_key signal_enriched:news_delta:e01eb7914dcd098c
throttle_s 0
created_at 2026-04-20T03:35:20.804275+00:00
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