Delete row sig_12f52423f5eb from signals

id sig_12f52423f5eb
event_id evt_affbc055bac9
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T12:38:37.654911+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1f8954d72da2421b
throttle_s 0
created_at 2026-04-20T12:38:37.654911+00:00
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