Delete row sig_1ac968a22b01 from signals

id sig_1ac968a22b01
event_id evt_6e57653f7551
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_df0d7b80d ...
dedupe_key signal_enriched:news_delta:e06ecdcd511ee9aa
throttle_s 0
created_at 2026-04-08T19:34:52.077563+00:00
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