Delete row sig_116b119bea6c from signals

id sig_116b119bea6c
event_id evt_a7644177c58b
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_e7f2b5aa4 ...
dedupe_key signal_enriched:news_delta:ef24cea59a49a10a
throttle_s 0
created_at 2026-04-19T01:31:58.428158+00:00
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