Delete row sig_dd41bc889479 from signals

id sig_dd41bc889479
event_id evt_5e09c91d3a00
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_e9047f913 ...
dedupe_key signal_enriched:news_delta:dc0f391d02d22864
throttle_s 0
created_at 2026-04-17T22:32:36.464462+00:00
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