Delete row sig_886e246ecf97 from signals

id sig_886e246ecf97
event_id evt_76beb706b13d
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_c1157fb07 ...
dedupe_key signal_enriched:news_delta:0808ddef603a3ea5
throttle_s 0
created_at 2026-04-16T15:45:16.917978+00:00
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