Delete row sig_811185b1ac3b from signals

id sig_811185b1ac3b
event_id evt_936e838491e8
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_b203d5cb9 ...
dedupe_key signal_enriched:news_delta:0a358d1d4961af91
throttle_s 0
created_at 2026-04-21T06:10:20.732520+00:00
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