Delete row sig_c250532b4b34 from signals

id sig_c250532b4b34
event_id evt_254988b5e6c7
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_94576ae18 ...
dedupe_key signal_enriched:news_delta:bcdd63454d0d3574
throttle_s 0
created_at 2026-04-22T15:19:29.533866+00:00
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