Delete row sig_b7f94740dac6 from signals

id sig_b7f94740dac6
event_id evt_72b25682590d
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_e47a1516e ...
dedupe_key signal_enriched:news_delta:65463f7f6fb6da60
throttle_s 0
created_at 2026-04-17T21:07:05.634873+00:00
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