Delete row sig_1e9775d2807b from signals

id sig_1e9775d2807b
event_id evt_ff485d988985
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_8292ffd1b ...
dedupe_key signal_enriched:news_delta:2adb3943a1748004
throttle_s 0
created_at 2026-04-06T20:42:08.264098+00:00
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