Delete row sig_c4001fc6cd85 from signals

id sig_c4001fc6cd85
event_id evt_151319020336
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T07:53:57.402684+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:abbc9ddd8d52f1c5
throttle_s 0
created_at 2026-04-17T07:53:57.402684+00:00
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