Delete row sig_b8af21692dd6 from signals

id sig_b8af21692dd6
event_id evt_e3f575c26ba5
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_a280045ea ...
dedupe_key signal_enriched:news_delta:51d780fd130d749c
throttle_s 0
created_at 2026-04-20T01:02:49.024331+00:00
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