Delete row sig_26197aa672ad from signals

id sig_26197aa672ad
event_id evt_b28fc1fcc1ee
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_f994659da ...
dedupe_key signal_enriched:news_delta:4b41179b14c6a1a1
throttle_s 0
created_at 2026-04-21T19:16:35.026956+00:00
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