Delete row sig_8c2afb0a5c5d from signals

id sig_8c2afb0a5c5d
event_id evt_cc883e428d02
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_fbb55b755 ...
dedupe_key signal_enriched:news_delta:c654648949159a64
throttle_s 0
created_at 2026-04-06T22:29:22.884918+00:00
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