Delete row sig_b5d429c021aa from signals

id sig_b5d429c021aa
event_id evt_e89ca57e4dd4
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T18:38:52.769114+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:8bf75468f8e5c9ef
throttle_s 0
created_at 2026-04-19T18:38:52.769114+00:00
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