Delete row sig_770ac91dfcb0 from signals

id sig_770ac91dfcb0
event_id evt_26d4c4adbafa
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_513fa13fa ...
dedupe_key signal_enriched:news_delta:f22544789221fcc6
throttle_s 0
created_at 2026-04-07T14:17:34.752207+00:00
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