Delete row sig_11ff532efc46 from signals

id sig_11ff532efc46
event_id evt_4a12a83d6ef4
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_5295e0c99 ...
dedupe_key signal_enriched:news_delta:19539a0cd04d4084
throttle_s 0
created_at 2026-04-19T04:31:33.341300+00:00
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