Delete row sig_fff31ddb15ce from signals

id sig_fff31ddb15ce
event_id evt_f75b8aaacb4b
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-08T07:37:51.414477+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:2adf8c88740da7a7
throttle_s 0
created_at 2026-04-08T07:37:51.414477+00:00
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