Delete row sig_2ddb5f973d93 from signals

id sig_2ddb5f973d93
event_id evt_158f7b45aead
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_f28615e63 ...
dedupe_key signal_enriched:news_delta:c649289284f86081
throttle_s 0
created_at 2026-04-21T01:31:11.745644+00:00
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