Delete row sig_91ae77a46201 from signals

id sig_91ae77a46201
event_id evt_b13a6888fb61
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_7dbb49e96 ...
dedupe_key signal_enriched:news_delta:f1b092660f5e0dc3
throttle_s 0
created_at 2026-04-06T20:06:10.479336+00:00
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