Delete row sig_e47c7208c2d9 from signals

id sig_e47c7208c2d9
event_id evt_4fc4394de1e1
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T14:07:02.517652+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c23d32e643d3a9c7
throttle_s 0
created_at 2026-04-12T14:07:02.517652+00:00
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