Delete row sig_226c346c9781 from signals

id sig_226c346c9781
event_id evt_fbc24a46a52a
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_4891f4fda ...
dedupe_key signal_enriched:news_delta:e3c6f72e300a0579
throttle_s 0
created_at 2026-04-10T00:04:56.344455+00:00
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