Delete row sig_103edf14d48d from signals

id sig_103edf14d48d
event_id evt_c8ace25efce8
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_09866220d ...
dedupe_key signal_enriched:news_delta:e451e1929b540d78
throttle_s 0
created_at 2026-04-19T04:31:33.438148+00:00
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