Delete row sig_4ecb52d31d29 from signals

id sig_4ecb52d31d29
event_id evt_83315ee9655b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T09:21:24.351017+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bd01ba4648896aac
throttle_s 0
created_at 2026-04-18T09:21:24.351017+00:00
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