Delete row sig_2d426bef9440 from signals

id sig_2d426bef9440
event_id evt_f516414f25cd
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T18:32:54.476780+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:56d6bd805df0c13c
throttle_s 0
created_at 2026-04-07T18:32:54.476780+00:00
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