Delete row sig_49e3cce46b97 from signals

id sig_49e3cce46b97
event_id evt_2cea6512df9a
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_48b0477c0 ...
dedupe_key signal_enriched:news_delta:2c7d042370bcd238
throttle_s 0
created_at 2026-04-16T13:45:43.447887+00:00
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