Delete row sig_cd3c197ad445 from signals

id sig_cd3c197ad445
event_id evt_e48bf7915ef7
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T06:10:42.428060+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c36ae723b46cb454
throttle_s 0
created_at 2026-04-18T06:10:42.428060+00:00
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