Delete row sig_919cd5477aa3 from signals

id sig_919cd5477aa3
event_id evt_b564f25384bf
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_1b52ae479 ...
dedupe_key signal_enriched:news_delta:9d09b69ddda153df
throttle_s 0
created_at 2026-04-07T23:39:52.209826+00:00
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