Delete row sig_a20e4baac370 from signals

id sig_a20e4baac370
event_id evt_141aa88225fa
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T07:24:20.945469+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e80bcd50a8924d69
throttle_s 0
created_at 2026-04-18T07:24:20.945469+00:00
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