Delete row sig_6e4c974220cd from signals

id sig_6e4c974220cd
event_id evt_32c283a1589a
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_ef7e14549 ...
dedupe_key signal_enriched:news_delta:a5fdea42b3fe47fc
throttle_s 0
created_at 2026-04-20T07:12:46.395991+00:00
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