Delete row sig_d7cc1a265da6 from signals

id sig_d7cc1a265da6
event_id evt_d3e23a35b36e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T06:14:58.545731+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f115e4bab2299571
throttle_s 0
created_at 2026-04-08T06:14:58.545731+00:00
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