Delete row sig_497c1273e002 from signals

id sig_497c1273e002
event_id evt_172c1a5a37d4
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_eb61b6f75 ...
dedupe_key signal_enriched:news_delta:511e6227064e2adb
throttle_s 0
created_at 2026-04-20T16:27:42.346706+00:00
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