Delete row sig_bd68e4857810 from signals

id sig_bd68e4857810
event_id evt_890f35c15237
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_af143d5fc ...
dedupe_key signal_enriched:news_delta:3f0e9b0f6f958875
throttle_s 0
created_at 2026-04-06T23:19:11.996788+00:00
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