Delete row sig_a28d27cf12a3 from signals

id sig_a28d27cf12a3
event_id evt_dbeb5cdc2c2e
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_c1b96bd2d ...
dedupe_key signal_enriched:news_delta:99ae7a2211071853
throttle_s 0
created_at 2026-04-09T10:33:00.483043+00:00
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