Delete row sig_3c220d018d38 from signals

id sig_3c220d018d38
event_id evt_c162d40bbc4a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T01:58:24.300360+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:757a74ebb00923c2
throttle_s 0
created_at 2026-04-18T01:58:24.300360+00:00
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