Delete row sig_219a54cf418d from signals

id sig_219a54cf418d
event_id evt_3c170f0a7926
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_bddd6a6e8 ...
dedupe_key signal_enriched:news_delta:65dc236fe0acaa15
throttle_s 0
created_at 2026-04-19T09:01:05.686760+00:00
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