Delete row sig_210778037bf6 from signals

id sig_210778037bf6
event_id evt_186e73f9eed5
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_0fdae80cf ...
dedupe_key signal_enriched:news_delta:45e84ec76507301f
throttle_s 0
created_at 2026-04-06T22:29:24.421409+00:00
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