Delete row sig_103a8acc4748 from signals

id sig_103a8acc4748
event_id evt_abfd7afe1654
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_ae67deafc ...
dedupe_key signal_enriched:news_delta:8958e71e6aa5a072
throttle_s 0
created_at 2026-04-19T15:01:01.676114+00:00
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