Delete row sig_1a191da6353c from signals

id sig_1a191da6353c
event_id evt_7ead9dd65ce6
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_6d511967c ...
dedupe_key signal_enriched:news_delta:dd404a9e7a68430c
throttle_s 0
created_at 2026-04-22T12:47:29.145642+00:00
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