Delete row sig_136285f831af from signals

id sig_136285f831af
event_id evt_6666b4da5cbb
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_5d6a4ac84 ...
dedupe_key signal_enriched:news_delta:d82525cfed86d4b5
throttle_s 0
created_at 2026-04-21T13:04:50.570295+00:00
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