Delete row sig_20a312edb27e from signals

id sig_20a312edb27e
event_id evt_91b7256ab047
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T10:16:55.209649+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0e620dab635f050b
throttle_s 0
created_at 2026-04-11T10:16:55.209649+00:00
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