Delete row sig_538697ca88df from signals

id sig_538697ca88df
event_id evt_c6161acf8ab4
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_6b42dba7a ...
dedupe_key signal_enriched:news_delta:920e82ecdafd0373
throttle_s 0
created_at 2026-04-11T14:22:55.853268+00:00
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