Delete row sig_21b89e998c1b from signals

id sig_21b89e998c1b
event_id evt_addcc148be8f
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_342800d81 ...
dedupe_key signal_enriched:news_delta:ab97aed1d1726eb6
throttle_s 0
created_at 2026-04-18T06:45:02.587127+00:00
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