Delete row sig_437310627200 from signals

id sig_437310627200
event_id evt_c05e70609b95
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_bb48ae557 ...
dedupe_key signal_enriched:news_delta:1ee98fd6b116e05b
throttle_s 0
created_at 2026-04-20T08:13:17.669874+00:00
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