Delete row sig_b6311577e86a from signals

id sig_b6311577e86a
event_id evt_45ba0d778d97
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_dcdba0e3e ...
dedupe_key signal_enriched:news_delta:916f42c1dc33ef18
throttle_s 0
created_at 2026-04-20T06:08:39.786897+00:00
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