Delete row sig_975d91e39dfb from signals

id sig_975d91e39dfb
event_id evt_b2784c2e6f70
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_f83ddb8ee ...
dedupe_key signal_enriched:news_delta:c3527cc43df5ae72
throttle_s 0
created_at 2026-04-22T07:27:53.172576+00:00
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