Delete row sig_fdef2202d259 from signals

id sig_fdef2202d259
event_id evt_99743344eb19
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T20:48:58.772110+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c9dabd4cd048ad79
throttle_s 0
created_at 2026-04-12T20:48:58.772110+00:00
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