Delete row sig_388679090349 from signals

id sig_388679090349
event_id evt_29af5c3c58d7
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_143f2e1d1 ...
dedupe_key signal_enriched:news_delta:3e7d2e03ce74c036
throttle_s 0
created_at 2026-04-07T01:06:12.580446+00:00
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