Delete row sig_905f15226408 from signals

id sig_905f15226408
event_id evt_e6e4593d37e0
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_7518bd384 ...
dedupe_key signal_enriched:news_delta:04267306be5e6447
throttle_s 0
created_at 2026-04-13T01:10:18.829229+00:00
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