Delete row sig_1f3825cec921 from signals

id sig_1f3825cec921
event_id evt_8e2db409dcf6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T01:44:00.445634+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7d22fd78f4d845c8
throttle_s 0
created_at 2026-04-12T01:44:00.445634+00:00
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