Delete row sig_23030de78773 from signals

id sig_23030de78773
event_id evt_43d73d2fc802
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_37df8db7d ...
dedupe_key signal_enriched:news_delta:70525e1450320901
throttle_s 0
created_at 2026-04-21T03:02:40.915984+00:00
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