Delete row sig_ed311632032a from signals

id sig_ed311632032a
event_id evt_4fae1b986b62
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_ba874ad5f ...
dedupe_key signal_enriched:news_delta:23c78d7ee777a805
throttle_s 0
created_at 2026-04-14T21:04:45.053678+00:00
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