Delete row sig_11772496f61f from signals

id sig_11772496f61f
event_id evt_5a6bc32ccdf0
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_f2aa0a7db ...
dedupe_key signal_enriched:news_delta:5663e32926573c7d
throttle_s 0
created_at 2026-04-10T19:36:12.053939+00:00
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