Delete row sig_a14345bb214c from signals

id sig_a14345bb214c
event_id evt_e611a85eaa9f
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_e3361b26c ...
dedupe_key signal_enriched:news_delta:e23043fc98de01cf
throttle_s 0
created_at 2026-04-15T06:03:51.688755+00:00
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