Delete row sig_103955dbfd95 from signals

id sig_103955dbfd95
event_id evt_0b866e7d7aaa
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_cb13a9afc ...
dedupe_key signal_enriched:news_delta:ba4ff57e622222a4
throttle_s 0
created_at 2026-04-22T07:27:53.130048+00:00
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