Delete row sig_fd1a153e9117 from signals

id sig_fd1a153e9117
event_id evt_b2dca5f186a0
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_b1a1111d1 ...
dedupe_key signal_enriched:news_delta:f41e73636aaec69c
throttle_s 0
created_at 2026-04-19T23:32:01.596190+00:00
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