Delete row sig_ca20714712c3 from signals

id sig_ca20714712c3
event_id evt_b16bb24567fb
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T02:13:38.646844+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6c34bee67dc2435b
throttle_s 0
created_at 2026-04-09T02:13:38.646844+00:00
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