Delete row sig_c012f7943907 from signals

id sig_c012f7943907
event_id evt_090e0f6ceb5c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T14:58:50.428600+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2a3fe521b9118814
throttle_s 0
created_at 2026-04-21T14:58:50.428600+00:00
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