Delete row sig_012974e33145 from signals

id sig_012974e33145
event_id evt_b5f533a23150
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_2e1de5a0a ...
dedupe_key signal_enriched:news_delta:355598f4de7acd11
throttle_s 0
created_at 2026-04-11T21:03:06.009396+00:00
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