Delete row sig_4b0d3ec69198 from signals

id sig_4b0d3ec69198
event_id evt_801344db9c1f
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T04:07:05.672772+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9c13a34f5b245c09
throttle_s 0
created_at 2026-04-22T04:07:05.672772+00:00
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