Delete row sig_2a724d62e099 from signals

id sig_2a724d62e099
event_id evt_96efda106425
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T12:16:59.317128+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c27480a86f06cffb
throttle_s 0
created_at 2026-04-20T12:16:59.317128+00:00
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