Delete row sig_8dd9f997bdf3 from signals

id sig_8dd9f997bdf3
event_id evt_68f86402fddb
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_e06cce7db ...
dedupe_key signal_enriched:news_delta:4d571d50f10cb10d
throttle_s 0
created_at 2026-04-18T20:11:34.023646+00:00
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