Delete row sig_629b88bf0420 from signals

id sig_629b88bf0420
event_id evt_cfdee06edf6e
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_41da53f63 ...
dedupe_key signal_enriched:news_delta:7148989921f08cb8
throttle_s 0
created_at 2026-04-20T06:23:49.277406+00:00
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