Delete row sig_23ad219d60d1 from signals

id sig_23ad219d60d1
event_id evt_6a115d2c6f2c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-03T18:21:56.624754+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:051096ef1eaae306
throttle_s 0
created_at 2026-04-03T18:21:56.624754+00:00
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