Delete row sig_b2c3dd56cd03 from signals

id sig_b2c3dd56cd03
event_id evt_45013faa9330
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_ac8c8b2ce ...
dedupe_key signal_enriched:news_delta:ad7230b124b4a19d
throttle_s 0
created_at 2026-04-20T23:24:22.122582+00:00
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