Delete row sig_550898dc6bec from signals

id sig_550898dc6bec
event_id evt_523f1251691e
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_b942cf693 ...
dedupe_key signal_enriched:news_delta:ee77f1d047908066
throttle_s 0
created_at 2026-04-20T06:57:43.384473+00:00
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